ライフサイエンスコーパス: catalyst

1 ewis acids and PPA-Co as a hydrogen transfer catalyst.

2 nchona derivatives (DHQ)(2)PYR was used as a catalyst.

3 c reaction between NH(4)(+) and a metal/nano-catalyst.

4 ying thiophenol-stabilized iodonium ion as a catalyst.

5 throughout the fibrous carbon network in the catalyst.

6 wly developed Rh(2) (S-2-Cl-5-CF(3) TPCP)(4) catalyst.

7 tion at room temperature in the absence of a catalyst.

8 those assembled with commercial Pt/C+RuO(2) catalyst.

9 final products depended on the nature of the catalyst.

10 hydroxide (CoOOH), an archetypical unary OER catalyst.

11 ly tailored bis-thiourea hydrogen-bond-donor catalyst.

12 ype K(2) CO(3) at the efficient carbon-based catalyst.

13 e the carbon deposit over the surface of the catalyst.

14 d the steric hindrance between substrate and catalyst.

15 eforming, is superior to the Mo-doped Ni/MgO catalyst.

16 synthesize secondary amines without using a catalyst.

17 y building unit (SBU) as a hydrogen-transfer catalyst.

18 ously reported monometallic heterogeneous Pt catalyst.

19 perimeter of copper/zinc oxide/alumina (CZA) catalyst.

20 Co(-I) complex is proposed as the direct pre-catalyst.

21 ring opening with CsF and a chiral bis-urea catalyst.

22 irmed that iron salts are the most efficient catalysts.

23 operando screening method for heterogeneous catalysts.

24 an that of some other transition-metal based catalysts.

25 sts as the most promising alternative to PGM catalysts.

26 ently emerged as main-group hydride transfer catalysts.

27 ion might assist with rational design of new catalysts.

28 he development of future adequately designed catalysts.

29 s using a pair of flavin and dialkylthiourea catalysts.

30 ming the design of next generation synthetic catalysts.

31 future design of more efficient supported Ag catalysts.

32 lity, but also the activity of heterogeneous catalysts.

33 unreacted/incompletely utilized reagents or catalysts.

34 hod to adjust the performance of single atom catalysts.

35 des on the catalytic properties of the model catalysts.

36 largely missing in the design of artificial catalysts.

37 esign of electrocatalysts and organometallic catalysts.

38 significantly activate single-site Ru-based catalysts.

39 ompounds that are widely used as ligands and catalysts.

40 es are more crucial for cobalt porphyrin ORR catalysts.

41 ard the rational design of new heterogeneous catalysts.

42 r than the activity of traditional Cu/ZrO(2) catalysts (159 g(MeOH)kg(cat)(-1)h(-1)).

43 An efficient CuPd nanoparticle (NP) catalyst (3 nm CuPd NPs deposited on carbon support) is

44 gen production rate (~212 umol h(-1) /0.02 g catalyst), 30 times higher than that of bulk C(3) N(4) .

45 tive acyl transfer promoted by amidine-based catalysts (ABCs) and a racemic chain mechanism mediated

46 invertase activity turn into microstructured catalysts according to electron microscopy outcomes.

47 fuel cell, platinum-group-metal (PGM)-based catalysts account for ~50% of the projected total cost f

48 Readily available magnesium catalysts achieve the selective hydroboration of a wide

49 Such reactivity, enabled by metal catalysts, additives, or visible-light irradiation, can

50 l-threonine-derived aminophenol-based boryl catalyst, affording the desired products in up to 91 % y

51 new 1-naphthyllactic acid-based iodine(III)-catalyst allows the control of tertiary carbon-fluorine

52 The catalyst also exhibited excellent durability when a chem

53 ...pai and pai...pai NCIs between the chiral catalyst and alpha-methylstyrene render the si-face bind

54 practical methods and strategies to mitigate catalyst and electrode degradation, which is fundamental

55 gand can maintain the monomeric structure of catalyst and gives relatively stable photoanodes with ph

56 C-O bond cleavage in peroxides using the Pd catalyst and H(2) is described, which enables the revers

57 t the competing solvation environment of the catalyst and Li(+) leads to LiOH precipitation at the ca

58 on fuel blendstocks, informed by advances in catalyst and process development.

59 that observed with the POM-free Cp*Rh@UiO-67 catalyst and reached TONs as high as 175 when prepared a

60 f Hf(12)-Ir-OTf over a mixture of photoredox catalyst and stoichiometric amounts of Bronsted acids or

61 rate of oxidative addition between palladium catalysts and alkyl/aryl electrophiles can be controlled

62 re active than traditional neutral cobalt(I) catalysts and approach rhodium catalysts in activity are

63 e way for the encapsulation of electroactive catalysts and electrocatalytic applications of such supr

64 the reported efficient Ni/MgO solid-solution catalysts and overstate the novelty and importance of th

65 ailoring of conditions or facile exchange of catalysts and reactions.

66 n, we examine the ability of OEEFs to assist catalysts and show that the rate of oxidative addition b

67 al that a Cu(I) species is likely the active catalyst, and DFT calculations suggest ligand sterics pl

68 rial components, i.e. immobilization matrix, catalyst, and label.

69 nificantly improve with structurally related catalysts, and a totally unexpected facial selectivity i

70 s one of the most representative single-atom catalysts, and it has a high activity and selectivity fo

71 organometallic heterodinuclear Zn(II)/Mg(II) catalyst applied in a one-pot procedure together with bi

72 les of cross metathesis with the macrocyclic catalyst are also provided.

73 nefits of tethering the two functions of the catalyst are demonstrated here in a tandem cycloisomeriz

74 Electride-based catalysts are among the emerging ones.

75 epts and development of low-PGM and PGM-free catalysts are discussed.

76 Transition metal-containing catalysts are employed, although accompanied with poor s

77 ion unit of a PEM fuel cell-or when PGM-free catalysts are integrated into an MEA.

78 transfer result in sluggish OER kinetics and catalysts are required.

79 The cobalt(II) phthalocyanine catalysts are topologically connected via robust phenazi

80 and Mn) and nitrogen co-doped carbon (M-N-C) catalysts as the most promising alternative to PGM catal

81 f Remazol black B dye by employing iron ions catalyst based gas diffusion cathodes, (GDCs).

82 Here, we demonstrate a heterogeneous catalyst based on atomically dispersed rhenium (ReO(4))

83 h the highest efficiency reported so far for catalysts based on a single metal ion mechanism.

84 In addition, copper catalysts bearing ligands possessing germanyl groups wer

85 In the presence of a chiral catalyst, both the central and axial chirality of the pr

86 kene double bonds, reminiscent of rhodium(I) catalysts but distinct from ruthenium(II) and nickel(II)

87 olites are widely applied supports for metal catalysts, but molecular sieves with comparable structur

88 ption and CO desorption over supported metal catalysts by employing a single self-assembly step where

89 cular strategies to complement heterogeneous catalysts by stabilizing intermediates through local mol

90 o illustrates how the study of trapped ionic catalysts can contribute to the understanding of reactio

91 e electrolytic cell assembled with these two catalysts can deliver 100 mA cm(-2) at 1.39 V.

92 ds to have well-defined sterically demanding catalysts capable of high levels of asymmetric induction

93 ameter controlling the energy of the enolate-catalyst complexes.

94 Under optimal condition, the catalyst composed by 10% of ZrO(2) supported over 90% of

95 ibution of Ti species throughout the polymer-catalyst composite particle shows that the continuous bi

96 volution pathway of precursors to ORR-active catalyst comprised exclusively of single-atom Fe(1)(II)-

97 law, first order in both propylene oxide and catalyst concentrations, and zeroth order in CO(2) press

98 g sufficient triple-phase boundaries between catalyst, conductive support and electrolyte.

99 In this study, an exceptionally stable MOF catalyst consisting of Pt nanoparticles (NPs) embedded i

100 n, we rationally design a new In single-atom catalyst containing exclusive isolated In(delta+) -N(4)

101 selectively hydrogenate CO(2) to methanol on catalysts containing Cu and ZrO(2).

102 gest that the difference in activity between catalysts containing large and small carbenes results mo

103 Catalyst-controlled intra- and intermolecular cyclizatio

104 However, catalyst-controlled methods that enable the selective fo

105 er HyperBTM or BTM identified as the optimal catalyst depending upon the substitution pattern within

106 ing metal organic framework design, TM-based catalyst design, the trafficking of TM ions in biologica

107 the application of microkinetic modeling for catalyst design.

108 PCET thermochemistry may guide heterogeneous catalyst design.

109 ble but also enables a versatile palette for catalyst design.

110 to harness principles of enzyme function for catalyst design.

111 The validity of this new catalyst-design concept is further demonstrated with the

112 similar functions to ligands in homogeneous catalysts, determining the stability, local environment,

113 w so as to open up opportunities for further catalyst development and innovation.

114 example of a general strategy to accelerate catalyst development which still remains underexplored.

115 The method employs a simple ruthenium catalyst, does not require external ligands, and affords

116 s validated with the study of vanadium-based catalysts during propane oxydehydrogenation (ODH).

117 This catalyst effectively promotes asymmetric Michael additio

118 not equal in terms of their contribution to catalyst efficacy, suggesting that tuning individual ele

119 ndant, renewable feedstocks, solvents, metal catalysts, energy, and redox reagents.

120 f systems, ranging from enzymes to synthetic catalysts, exert adaptive motifs to maximize their funct

121 Consequently, the catalyst exhibits a superior visible-light photocatalyti

122 This catalyst exhibits an extremely large turnover frequency

123 n to previous catalysts, the GPhos-supported catalyst exhibits better reactivity both under ambient c

124 or the first time we employ iron single-atom catalysts (Fe-N-C SACs) as an advanced co-reactant accel

125 The hybrid peptide-thiourea catalyst features a N-terminal proline moiety for aldehy

126 ery small Pt crystallites in supported-metal catalysts following harsh treatments is an important ind

127 e, with the hope that this paper serves as a catalyst for a renewed research agenda into intervention

128 , as a new ligand that forms a highly active catalyst for hydroboration of unactivated 1,2-disubstitu

129 hese materials can be applied as the cathode catalyst for Li-O(2) battery operations with a record-hi

130 duction and ability to turn into a selective catalyst for methanol synthesis in CO(2) hydrogenation w

131 edbacks from Sahara drying may have been the catalyst for societal shifts in MSEA via ocean-atmospher

132 med to demonstrate the crucial role of boron catalyst for the activation of the intermediate dibenzyl

133 It employs a FeO(OH) catalyst for the ortho- to para-state conversion.

134 cently been identified as a highly efficient catalyst for the oxidative dehydrogenation of propane (O

135 s (NPs) in solution as promising alternative catalysts for alkene hydrosilylation with the industrial

136 d to provide a leap forward in the design of catalysts for asymmetric transformations.

137 ytochrome P411 variants to identify improved catalysts for C-H alkylation.

138 have traditionally relied on precious-metal catalysts for C-H bond cleavage and, as a result, displa

139 ve efforts have been dedicated to developing catalysts for hydroamination, the vast majority of alken

140 present a highly promising class of low-cost catalysts for hydrogen evolution reaction (HER).

141 the popular platinum group-metal (PGM)-free catalysts for many electrochemical reactions.

142 rticles or metal complexes have been used as catalysts for many reactions.

143 rochemical hydrogen evolution reaction (HER) catalysts for noble metals.

144 luates the challenges of designing molecular catalysts for oxidation of ammonia and highlights recent

145 iding a platform for tailoring heterogeneous catalysts for targeted applications.

146 Despite recent research on Cu-based catalysts for the CO(2) and CO reduction reactions, surf

147 The copper hydride complexes are efficient catalysts for the dehydrogenation of formic acid to H(2)

148 ovelty and importance of the Mo-doped Ni/MgO catalysts for the dry reforming of methane.

149 recently been identified as highly selective catalysts for the oxidative dehydrogenation (ODH) of alk

150 recently been identified as highly selective catalysts for the oxidative dehydrogenation of alkanes s

151 s are leading candidates to replace platinum catalysts for the oxygen reduction reaction (ORR) in fue

152 Engaging two transition metal catalysts for this goal presents a considerable degree o

153 Here we report a new approach to oxidation catalysts for total oxidation of hydrocarbons (e.g., pro

154 than classical homogeneous and heterogeneous catalysts for tuning reactivity for such a demanding pro

155 vity of a well-defined CeO(2)/Cu(2)O/Cu(111) catalyst from carbon monoxide and carbon dioxide to meth

156 ) ligation environment, yet, molecular model catalysts generally feature pyrrolic coordination.

157 role in determining Cu coordination and thus catalyst geometry.

158 nderstanding the strategies of nucleic acids catalysts has been made by providing thorough structural

159 be achieved in the context of small-molecule catalysts has had sizable impact on the field of asymmet

160 nes with sodium azide in the presence of IBX catalyst, has been reported.

161 Trends in variation of substrates and catalysts have also been reproduced by our calculations.

162 Photoredox catalysts have been gaining popularity in highly reducin

163 the initial report in 2000, metal-ProPhenol catalysts have been used to facilitate a broad range of

164 In many cases, these peptide-based catalysts have enabled novel multifunctional substrate a

165 as batteries, biomaterials and heterogeneous catalysts have functions that are defined by mixtures of

166 Iron porphyrin catalysts have long been studied for the ORR, but the or

167 These catalysts have low linear-to-branched (L:B) regioselecti

168 Ni,N-doped carbon catalysts have shown promising catalytic performance for

169 tion of Al and H association on a dry HZSM-5 catalyst, i.e., under conditions representative of typic

170 oxygenase, the predominant methane oxidation catalyst in nature.

171 rmance of a commercial V(2)O(5)-WO(3)/TiO(2) catalyst in NH(3)-SCR of NO(x) under dry conditions has

172 is result encouraged us to test this optimal catalyst in the mechanistically related Friedel-Crafts a

173 action employs commercially available Co(II) catalyst in the presence of Mn(III) cooxidant and oxygen

174 ral cobalt(I) catalysts and approach rhodium catalysts in activity are reported here.

175 ng, demonstrating the broad utility of these catalysts in additive manufacturing.

176 In this work, nitrenium ions are explored as catalysts in five organic transformations.

177 y (1.2 nm) between photoredox and Lewis acid catalysts in Hf(12)-Ir-OTf, which not only facilitates t

178 nd modulate the mobility of transition metal catalysts in living environs.

179 at the use of two mutually compatible chiral catalysts in one-pot conditions can help realize the lon

180 Monometallic catalysts, in particular those containing noble metals,

181 e can increase reaction rate owing to faster catalyst initiation.

182 In this study, a highly active catalyst is designed: electrochemically delithiated LiNi

183 We further show that the NAC catalyst is versatile for dehydrogenation of ethylbenzen

184 (.) ) in the ODHP reaction over boron-based catalysts is achieved by using online synchrotron vacuum

185 se) near the active site of metal-containing catalysts is an effective way to improve selectivity and

186 nanoparticle spatial distribution in powder catalysts is conventionally not quantified, and the infl

187 The development of novel and efficient catalysts is crucial for progress in chemical sciences,

188 The need for active and stable oxidation catalysts is driven by the demands in production of valu

189 s that glass acts as a "green" heterogeneous catalyst: it participates as a base in the deprotonation

190 le heterogeneous water oxidation by the same catalyst leads exclusively to oxygen.

191 y coupled at room temperature using previous catalysts, led to the design of a new dialkylbiaryl mono

192 alyst loading on ROMP monomer conversion and catalyst lifetime.

193 ows a turnover frequency of 800 h(-1) at low catalyst loading (0.025 mol %, 70 degrees C, 30 bar CO(2

194 ing reaction was optimized using CuI and low catalyst loading (down to 5 mol %).

195 Grand stability challenges exist when PGM catalyst loading is decreased in a membrane electrode as

196 tion pH, the presence of salt additives, and catalyst loading on ROMP monomer conversion and catalyst

197 often necessitate elevated temperature, high catalyst loading, etc.

198 (up to 97% ee) at an unusually low 0.2 mol % catalyst loading.

199 Using low catalyst loadings (<1 mol percent), benzene and other fu

200 and other oxacyclic scaffolds under very low catalyst loadings.

201 lishing links between structural motifs in a catalyst, local electronic structure, and catalytic prop

202 tions with a record-high current density per catalyst mass loading of 2000 mA g(cat.) (-1) , as well

203 the selectivity: reactor studies of complex catalyst materials at operating temperature and pressure

204 d high porosity which are ideal supports for catalyst materials.

205 wo relevant CB7 effects are proposed, a base-catalyst mediated by the CB7 portal and an inhibitory ro

206 Single-atom catalysts not only maximize metal atom efficiency, they

207 essure and room temperature with a molecular catalyst of vanadium (V)-oxo dimer.

208 estricted by the intrinsic activity of these catalysts often being comparable to polycrystalline copp

209 OF chemistry to get well-defined single site catalyst on MOF inorganic secondary building units, in p

210 By contrast, immobilization of the Ru-bda catalyst on TiO(2) with the 4,4'-dipyridyl anchoring lig

211 ategy to fabricate various metal single-atom catalysts on nitrogen-doped carbon (M(1)/CN, M = Pt, Ir,

212 e reaction conditions are mild with no metal catalyst or additives required and display good function

213 the presence or absence of a polymerization catalyst or tubulin-binding drugs.

214 the water-air interface of microdroplets, no catalysts or external electrical bias, as well as precur

215 Applying harsh conditions, highly active catalysts or highly reactive bonding groups, as is done

216 trates, and A(3)-couplings are performed via catalyst- or reaction condition-dependent processes.

217 tributor to the fragmentation pathway of the catalyst particle as a whole.

218 the influence of this collective property on catalyst performance remains poorly investigated.

219 ting methods, however, commonly exhibit poor catalyst performance with high palladium (Pd) loading (e

220 ties to tailor shape selectivity and enhance catalyst performance.

221 structures of carboxylic acids bound by the catalyst, point to a plausible resting state of the cata

222 de surfaces is a key step towards addressing catalyst poisoning mechanisms in fuel cells.

223 f our experiments indicated that Grubbs-type catalysts possess such multitask activity, catalyzing th

224 des using robust and recyclable supported Pd catalysts, producing only CO and H(2)O as waste.

225 In conjunction with the catalyst, protic chain transfer agents (CTAs) initiate p

226 on, gives surfaces with a 5:1 chromophore to catalyst ratio.

227 This reusable Pd catalyst reflected its utility in the synthesis of biolo

228 This activated catalyst remained stable for more than 200 h.

229 lliamperes per square centimetre in the best catalyst reported so far(9)), resulting in a low energy

230 Pd-catalysts represent an appealing alternative, yet their

231 e structure and composition of heterogeneous catalysts, revealing the nature of the active sites and

232 rticle electrodes, addition of the molecular catalysts, Ru(bda)(L)(2) (bda = 2,2'-bipyridine-6,6'-dic

233 Single-atom catalysts (SACs) have shown superior activity and/or sel

234 we developed a hierarchical high-throughput catalyst screening (HHTCS) approach based on the recentl

235 The alkynyl substituent favorably tunes catalyst solubility, aggregation, and conformation while

236 high conversion yields (25%), and long-term catalyst stability (>14h).

237 The highest catalyst stability of the 5Ni/3Mg-ZrO(2) catalyst was ex

238 Ramifications on catalyst structure-function relationships are discussed,

239 gnetic field strength data on active zeolite catalyst structures to date and enable for the first tim

240 t, point to a plausible resting state of the catalyst-substrate complex predisposed for asymmetric ch

241 monotonically with particle size on Pt-rich catalysts, suggesting that the reaction is structure dep

242 rganic monolayer films were deposited on the catalyst support.

243 sters using a rationally designed iron-based catalyst supported by beta-diketiminate ligands are desc

244 We assess the literature of such catalysts supported on zeotype materials, metal-organic

245 well-stabilized chemical state of Cu on the catalyst surface under the working CO(2)RR conditions, w

246 bate-adsorbate repulsive interactions on the catalyst surface which adjust with respect to the reacti

247 Traditional wet-chemistry catalyst synthesis often requires complex procedures wit

248 er catalytic activity than the corresponding catalysts synthesized by different grafting methods.

249 lted in a highly active and enantioselective catalyst system for the allylation of various alpha-bran

250 n pathways using bases and a simple Pd-based catalyst system to promote a para-selective C-H function

251 metric catalysis by a chiral phosphoric acid catalyst that controls both enantioselective addition of

252 The [Cu(OTf)](2) .benzene catalyst that has been standard in this reaction for man

253 propane (C(3) H(8) ) over a Pt/TiO(2) -WO(3) catalyst that severely suffers from oxygen poisoning at

254 We show that the Ni/MgO solid-solution catalyst that we reported in 1995, which is efficient an

255 By combining metal-oxide WD catalysts that are efficient near the acidic proton-exch

256 nic cobalt(II) bisphosphine hydrido-carbonyl catalysts that are far more active than traditional neut

257 n chemical bonds will depend on pH-universal catalysts that are not only impervious to acid, but actu

258 Nanoscale catalysts that can enable Fenton-like chemistry and prod

259 challenge in chemical research is to design catalysts that select the outcomes of the reactions of c

260 By using the Ru(7)Ni(3)/C catalyst, the anode cost can be reduced by 85% of the cu

261 d with a cobalt phthalocyanine-based cathode catalyst, the hybrid electrode achieves a CO Faradaic ef

262 as been widely studied as methanol oxidation catalyst, the initial process of oxidizing Ni(OH)(2) to

263 In comparison to previous catalysts, the GPhos-supported catalyst exhibits better

264 of Cu based heterogeneous methanol synthesis catalysts through CO(2) hydrogenation is one of the majo

265 se reduction steps require the presence of a catalyst to activate the reducing agent.

266 ed using an aspartic acid containing peptide catalyst to afford stable, helically chiral products in

267 attributed to the ability of the macrocyclic catalyst to differentiate alkenes based on their size.

268 they use a relatively abundant and non-toxic catalyst to selectively deliver high-value products from

269 arbon-supported single-site molybdenum-dioxo catalyst to terephthalic acid (PTA) and ethylene.

270 The intra-bandgap states here act as catalysts to assist I(3)(-) reduction.

271 e ability of hydrogen bonding phase-transfer catalysts to couple two ionic reactants, affords enantio

272 hynylphosphonates required gold complexes as catalysts to provide the corresponding 2-aryl(alkyl) sub

273 dition of the aryl halide (ArX) to the Pd(0)-catalyst, transmetallation of the Na- or K-enolate gener

274 howing excellent promise as highly efficient catalysts under inert atmosphere conditions.

275 eductive aminations to discuss the potential catalysts used and applicability of this methodology in

276 We tested these 2D catalysts using a model reaction that assesses external

277 lation of 9H-fluorene using alcohol and a Ru catalyst via the borrowing hydrogen concept has been des

278 ich is fundamentally essential to make M-N-C catalysts viable in PEMFC technologies.

279 est catalyst stability of the 5Ni/3Mg-ZrO(2) catalyst was explained by the ability of CO(2) to partia

280 he use of a recently-developed isoselenourea catalyst was optimal, with equivalent enantioselectivity

281 To accelerate the development of improved HB catalysts, we developed a hierarchical high-throughput c

282 ant in the performance of iron porphyrin ORR catalysts, we suggest that electrostatic stabilizers of

283 Halogenated BODIPY photoredox catalysts were additionally employed to produce complex

284 Cation-binding salen nickel catalysts were developed for the enantioselective alkyny

285 These catalysts were evaluated with four electron-deficient al

286 d morphology, and their respective Ni/CeO(2) catalysts were prepared by impregnation of the previousl

287 The introduction of a catalyst, which introduces a second catalytic cycle into

288 ts assisted the discovery of a new Ti(salen) catalyst, which substantially expanded the reaction scop

289 ntrolled synthesis of Pt-based intermetallic catalysts, which can pave a way for the commercializatio

290 These observations inform the development of catalysts whose activity can be tuned by an external for

291 ion of CO(2) to C(2+) products requires a Cu catalyst with a high density of defect sites that promot

292 Our work introduces a novel catalyst with improved OER performance, Y(1.8)Cu(0.2)Ru(

293 methylaminopyridine (DMAP) and Cu(OAc)(2) as catalysts with as low as 0.1 mol % loading, providing pr

294 prevented the development of site-selective catalysts with broad scope.

295 ct-rich boron nitride (BN) nanosheet (Ni/BN) catalysts with higher methanol dehydrogenation activity

296 iscovery of a series of new oxide perovskite catalysts with improved OER activity.

297 of inexpensive and environmentally friendly catalysts with industrially relevant performance were id

298 e growing rapidly, leading to discoveries of catalysts with new properties.

299 emical CO(2) reduction mechanism over the Cu catalysts with various oxidation states was studied by u

300 Given their multitask nature, such catalysts would be particularly attractive for the devel