MCM-41-supported platinum carbonyl cluster-derived catalysts for asymmetric and nonasymmetric hydrogenation reactions

Basu, Susmit; Mapa, Maitri; Gopinath, Chinnakonda S.; Doble, Mukesh; Bhaduri, Sumit; Lahiri, Goutam Kumar

doi:10.1016/j.jcat.2006.01.032

Cited by 49 publications

(28 citation statements)

References 54 publications

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“…14,15 These catalysts were effective for the asymmetric hydrogenation of MPV to ML, but significant ABSTRACT: The asymmetric hydrogenation of methyl pyruvate to methyl lactate, by cinchonidium functionalized MCM-41 supported [Ru 4 (μ-H) 3 (CO) 12 ] À as the precatalyst has been studied kinetically and by scanning transmission electron microscopy (STEM). Existence of an induction time and two competitive equilibriums are inferred from the time monitored conversion data.…”

Section: Introductionmentioning

confidence: 99%

Kinetic and Scanning Transmission Electron Microscopy Investigations on a MCM-41 Supported Cluster Derived Enantioselective Ruthenium Nanocatalyst

et al. 2011

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The asymmetric hydrogenation of methyl pyruvate to methyl lactate, by cinchonidium functionalized MCM-41 supported [Ru4(μ-H)3(CO)12]− as the precatalyst has been studied kinetically and by scanning transmission electron microscopy (STEM). Existence of an induction time and two competitive equilibriums are inferred from the time monitored conversion data. Steady state approximation gives a poor fit, but a kinetic model (Eley−Rideal) consisting of a fast equilibrium between methyl pyruvate and the catalyst, a slow one between the catalyst and dihydrogen, and a rate determining reaction between the latter and methyl pyruvate, accurately simulates the time monitored conversion profiles. The model suggests that on increasing the methyl pyruvate concentration there is a change in the stoichiometry of the equilibrium between the catalyst and the methyl pyruvate. The change in enantioselectivity with time can also be accurately simulated by assuming enantiomeric excess to be proportional to the rate constant for methyl lactate formation. Both kinetic and STEM data strongly suggest that in the fresh catalyst the bare metal cluster framework is retained, and under the catalytic conditions agglomeration of the subnano sized clusters leading to the formation of nanoparticles of ruthenium is a relatively slow process. A hypothetical enantionface selection mechanism consistent with the empirical rate law, previous reports, and other experimental evidence is proposed.

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Section: Introductionmentioning

confidence: 99%

Kinetic and Scanning Transmission Electron Microscopy Investigations on a MCM-41 Supported Cluster Derived Enantioselective Ruthenium Nanocatalyst

et al. 2011

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“…New types of catalysts such as platinum colloids [19] and Pt particles supported on inorganic materials other than Al 2 O 3 and SiO 2 have also been explored at around the same time. Moderate to good enantiomeric excesses (ees) were obtained with Pt/MCM-41 [20][21][22], Pt/HNaY [23], Pt/clay [24,25], Pt/LDH [26], and Pt/SWNTs catalysts [27].…”

Section: Introductionmentioning

confidence: 99%

Effective and Reusable Pt Catalysts Supported on Periodic Mesoporous Resols for Chiral Hydrogenation

Shen

Rong

et al. 2007

Catal Lett

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Platinum nanoparticles supported on periodic mesoporous resols by simple impregnation serve as effective, robust and remarkably reusable catalysts after chirally modified with cinchonidine for the asymmetric hydrogenation of ethyl pyruvate, affording up to 62% enantiomeric excess (ee) and a constant activity after 25th re-use. They can also catalyze the reaction in an environmentally benign manner by using water as a solvent.

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“…However, these materials supported Pt catalysts showed only mediocre performance, except cinchonidine(CD)-modified 5 wt% Pt/Al 2 O 3 exhibited excellent enantioselectivity. With the development of periodic mesoporous materials, MCM-41 [13], FDU-type periodic mesoporous resols (PMRs) [14] and CMK-8 carbons [15] were adopted as supports for Pt nanoparticles in the heterogeneous asymmetric hydrogenation of α-ketoesters, obtaining medium to good enantiomeric excesses (ees).…”

Section: Introductionmentioning

confidence: 99%

Alumina incorporated with mesoporous carbon as a novel support of Pt catalyst for asymmetric hydrogenation

Zhang

Xiao

et al. 2013

Catalysis Communications

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MCM-41-supported platinum carbonyl cluster-derived catalysts for asymmetric and nonasymmetric hydrogenation reactions

Cited by 49 publications

References 54 publications

Kinetic and Scanning Transmission Electron Microscopy Investigations on a MCM-41 Supported Cluster Derived Enantioselective Ruthenium Nanocatalyst

Kinetic and Scanning Transmission Electron Microscopy Investigations on a MCM-41 Supported Cluster Derived Enantioselective Ruthenium Nanocatalyst

Effective and Reusable Pt Catalysts Supported on Periodic Mesoporous Resols for Chiral Hydrogenation

Alumina incorporated with mesoporous carbon as a novel support of Pt catalyst for asymmetric hydrogenation

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