Lead modified platinum on carbon catalyst for the selective oxidation of (2−) hydroxycarbonic acids, and especially polyhydroxycarbonic acids to their 2-keto derivatives

Smits, P.C.; Kuster, Bfm Ben; Wiele, van der K Kees; Baan, van der Hs Hessel

doi:10.1016/s0166-9834(00)80585-0

Cited by 73 publications

(41 citation statements)

References 22 publications

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“…Pd/C doped with Pb or Te is reportedly an active catalyst for the reaction at pH 8, adjusted by aqueous NaOH, while no catalytic activity was observed using Pd/C under atmospheric pressure 5)～7) . This has been further supported by previous results obtained from the catalytic oxidation of D-Gluconic acid using Pt/C doped and undoped with Pb 8) . However, recent reports state that the use of pressurized O2 resulted in great activity for the reaction of sodium lactate to sodium pyruvate using heavy-metal-free Pd/C, indicating that loading by heavy metals is not needed for the catalytic reaction 9),10) .…”

Section: Introductionsupporting

confidence: 86%

Direct Oxidative Esterification of Propionaldehyde to Methyl Propionate Using Heavy-metal-free Palladium Catalysts under Pressurized Oxygen

Sugiyama

Bando

Tanaka

et al. 2011

J. Jpn. Petrol. Inst.

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The use of pressurized oxygen greatly enhanced catalytic activity for oxidative esterification of propionaldehyde to methyl propionate with methanol using heavy-metal-free Pd/C and Pd/Al2O3. For example, the conversion of propionaldehyde, the selectivity to methyl propionate, and the yield of the propionate using 5 % Pd/Al2O3 were 99.9, 62.7, and 62.6 %, respectively, at 1.5 MPa of oxygen gas and 333 K. This result demonstrated that Pb doping of Pd catalysts was not needed to achieve comparable activity, which runs contrary to previous reports, in which it had been suggested that loading of Pd catalysts using a heavy metal such as Pb was needed for the great activity such as 93.2, 76.8, and 71.6 % of the conversion of propionaldehyde, the selectivity to methyl propionate, and the yield of the propionate, respectively, at 0.3 MPa of oxygen gas and 353 K using 5 % Pd/Al2O3 doped with 5 % Pb.

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Section: Introductionsupporting

confidence: 86%

Direct Oxidative Esterification of Propionaldehyde to Methyl Propionate Using Heavy-metal-free Palladium Catalysts under Pressurized Oxygen

Sugiyama

Bando

Tanaka

et al. 2011

J. Jpn. Petrol. Inst.

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“…In the field of carbohydrate oxidation product adsorption was found to deactivate the catalyst for the oxidation of D-glucose (22) and D-gluconic acid (23) in acidic media. In electrochemical oxidations of alcohols in acidic media, CO from aldehyde intermediates was found to cover active sites (7,24,25), but no CO poisoning was observed for D-glucose oxidation (22).…”

Section: Introductionmentioning

confidence: 99%

Graphite-Supported Platinum Catalysts: Effects of Gas and Aqueous Phase Treatments

Vleeming

Kuster

Marin

et al. 1997

Journal of Catalysis

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The effects on the platinum particle diameter and the available platinum surface area of a graphite-supported platinum catalyst resulting from pretreatments and from performing a selective oxidation reaction are investigated. In the gas phase considerable catalyst sintering occurs only in the presence of oxygen at 773 K due to extensive carbon burn-off, whereas in an aqueous phase platinum particle growth is limited upon oxidative treatment. A hydrogen treatment in aqueous phase at 363 K causes platinum particle growth, aggregate formation, and covering of metal sites. These phenomena become more important with increasing pH. Platinum particle growth and aggregate formation are attributed to platinum particle rather than platinum adatom mobility and is caused by the destruction of the oxygen-containing surface groups on the graphite support, which serve as anchorage sites for the platinum particles. Site covering is caused by products originating from the graphite support, which are formed as a result of the reductive treatments. When performing the aqueous phase oxidation of methyl α-D-glucopyranoside at 323 K and a pH of 9, catalyst modifications are small under oxidative conditions. Exposure of the catalyst for several hours to methyl α-D-glucopyranoside under the same conditions but in the absence of oxygen causes site covering.

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“…The selective oxidation of polyfunctional alcohols in the 2-position has been attributed to special interactions involving the positively charged promoter atom (Fig. 2) [106][107][108]. Other assumptions are bifunctional catalysis [98], the formation of an intermetallic compound as the active material [109,110], and a change in the adsorption properties of Pt or Pd induced by the promoter atom [111].…”

Section: Zeolitesmentioning

confidence: 99%

“…An unambiguous explanation is rarely possible due to missing in-situ studies, though a comparison of alcohol dehydrogenation in the presence and absence of oxygen can provide a simple discrimination of the promoter effect [112]. One frequently observed phenomenon is ''overoxidation'' of the active sites during alcohol oxidation [87,106]. The reason for this type of catalyst deactivation is that oxygen adsorbs more strongly on Pt-group metals than do alcohols.…”

Section: Zeolitesmentioning

confidence: 99%

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Oxidation of Alcohols with Molecular Oxygen

Mallát

Baiker

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Oxidation in the Gas Phase Metals Oxides Phosphates Zeolites Oxidation in the Liquid Phase Platinum‐Group Metals Gold Oxides Molecular Sieves Hydrotalcites Phosphates and Apatites Heterogenized Metal Complexes Summary

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Lead modified platinum on carbon catalyst for the selective oxidation of (2−) hydroxycarbonic acids, and especially polyhydroxycarbonic acids to their 2-keto derivatives

Abstract: Lead modified platinum on carbon catalysts for the selective oxidation of (2-) hydroxycarbonic acids, and especially polyhydroxycarbonic acids to their 2-keto derivatives. Applied Catalysis, 33(1), 83-96.

Cited by 73 publications

References 22 publications

Direct Oxidative Esterification of Propionaldehyde to Methyl Propionate Using Heavy-metal-free Palladium Catalysts under Pressurized Oxygen

Direct Oxidative Esterification of Propionaldehyde to Methyl Propionate Using Heavy-metal-free Palladium Catalysts under Pressurized Oxygen

Graphite-Supported Platinum Catalysts: Effects of Gas and Aqueous Phase Treatments

Oxidation of Alcohols with Molecular Oxygen

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