Oxidation of propylene glycol and lactic acid to pyruvic acid in aqueous phase catalyzed by lead-modified palladium-on-carbon and related systems

Tsujino, Takeshi; Ohigashi, S.; Sugiyama, Shigeru; Kawashiro, Katsuhiro; Hayashi, Hiromu

doi:10.1016/0304-5102(92)80005-2

Cited by 105 publications

(87 citation statements)

References 10 publications

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“…Also, decarboxylation of diethyltartrate , oxidation of propylene glycol (Tsujino et al, 1992), and oxidative dehydrogenation of lactic acid (Ai and Ohdan, 1995), in the presence of heavy metals as catalysts and high temperatures, are common methods of pyruvate production. These ''classical'' processes have in common that they are energyintensive and that they make use of heavy metals, which is controversial with respect to environmental protection and sustainable process development.…”

Section: Introductionmentioning

confidence: 99%

Process strategies to enhance pyruvate production with recombinant Escherichia coli: From repetitive fed‐batch to in situ product recovery with fully integrated electrodialysis

Zelić

Gostović

Vuorilehto

et al. 2004

Biotech & Bioengineering

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Using the pyruvate production strain Escherichia coli YYC202 ldhA::Kan different process alternatives are studied with the aim of preventing potential product inhibition by appropriate product separation. This strain is completely blocked in its ability to convert pyruvate into acetyl-CoA or acetate, resulting in acetate auxotrophy during growth in glucose minimal medium. Continuous experiments with cell retention, repetitive fed-batch, and an in situ product recovery (ISPR) process with fully integrated electrodialysis were tested. Although the continuous approach achieved a high volumetric productivity (QP) of 110 g L(-1) d(-1), this approach was not pursued because of long-term production strain instabilities. The highest pyruvate/glucose molar yield of up to 1.78 mol mol(-1) together with high QP 145 g L(-1) d(-1) and high pyruvate titers was achieved by the repetitive fed-batch approach. To separate pyruvate from fermentation broth a fully integrated continuous process was developed. In this process electrodialysis was used as a separation unit. Under optimum conditions a (calculated) final pyruvate titer of >900 mmol L(-1) (79 g L(-1)) was achieved.

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Section: Introductionmentioning

confidence: 99%

Process strategies to enhance pyruvate production with recombinant Escherichia coli: From repetitive fed‐batch to in situ product recovery with fully integrated electrodialysis

Zelić

Gostović

Vuorilehto

et al. 2004

Biotech & Bioengineering

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“…11 The use of lower reaction temperatures usually results in rapid catalyst deactivation due to the blocking of the catalytic surface by oligomers of LA. 3 Phosphate-based catalysts, 11,12 usually containing transition metal promoters, 13 are currently the benchmark systems for oxidative dehydrogenation of LA and its alkylated derivatives. Ai et al described an iron phosphate catalyst for the gas-phase oxidation of LA, which gave a maximum PyA yield of 50% (66% PyA selectivity at 76% LA conversion) at 260°C.…”

Section: Introductionmentioning

confidence: 99%

MoO₃–TiO₂ synergy in oxidative dehydrogenation of lactic acid to pyruvic acid

et al. 2017

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An efficient catalytic process for the oxidative dehydrogenation of biomass-derived lactic acid by earthabundant MoO 3 /TiO 2 mixed oxide catalysts is presented. A series of MoO 3 /TiO 2 materials with varied MoO 3 loadings were prepared and their performance in the aerobic and anaerobic conversion of lactic acid was evaluated. A strong synergistic effect between MoO 3 and TiO 2 components of the mixed oxide catalyst was observed. Optimum catalysts in terms of activity and pyruvic acid selectivity can be obtained by ensuring a high dispersion of MoO x species on the titania surface. Mo-oxide aggregates catalyze undesired side-reactions. XPS measurements indicate that the redox processes involving supported Mo ions are crucial for the catalytic cycle. A mechanism is proposed, in which lactic acid adsorbs onto basic sites of the titania surface and is dehydrogenated over the MovO acid-base pair of a vicinal tetrahedral Mo site. The catalytic cycle closes by hydrolysis of surface pyruvate and water desorption accompanied by the reduction of the Mo center, which is finally oxidized by O 2 to regenerate the initial active site. Under anaerobic conditions, a less efficient catalytic cycle is established involving a bimolecular hydrogen transfer mechanism, selectively yielding propionic and pyruvic acids as the major products. The optimum catalyst is 2 wt% MoO 3 /TiO 2 predominantly containing tetrahedral Mo species. With this catalyst the oxidative conversion of lactic acid at 200°C proceeds with a selectivity of ca. 80% to pyruvic acid. The pyruvic acid productivity is 0.56 g g −1 h −1 .

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“…In another proposal, Bock et al [69] claimed that the stabilizing agent from microwave-assisted heating of ethylene glycol should be oxalic and glycolic acid. The use of propylene glycol differs from ethylene glycol only in the final obtained stabilizer that are lactic and pyruvic acids [72,73].…”

Section: Microemulsion Methodmentioning

confidence: 99%

Direct Ethanol Fuel Cell on Carbon Supported Pt Based Nanocatalysts

Almeida

Şahin

Olivi

et al. 2016

Nanostructure Science and Technology

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One of the biggest problems nowadays comes from the progressive increase in the concentration of toxic gases due to combustion of fossil fuels, which represents a large part of the energy consumed by the society. The greenhouse gas emissions, especially in large urban centers, reach every year increasingly levels. Besides the large industries, urban transport is another main factor responsible for pollution.The need for cleaner energy sources and converter systems that combine high efficiency and reduction of environmental impacts has attracted increasing interest from the scientific community. In this context, fuel cells, system capable of converting chemical energy into electrical energy, are receiving special attention mainly due to its ability to generate electricity efficiently and not aggressive to the environment. The versatility of such systems is the feasible use of various fuels, efficient energy conversion, silent operation, and high applicability. These make this system an attractive technology for a "clean" future [1].

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Oxidation of propylene glycol and lactic acid to pyruvic acid in aqueous phase catalyzed by lead-modified palladium-on-carbon and related systems

Cited by 105 publications

References 10 publications

Process strategies to enhance pyruvate production with recombinant Escherichia coli: From repetitive fed‐batch to in situ product recovery with fully integrated electrodialysis

Process strategies to enhance pyruvate production with recombinant Escherichia coli: From repetitive fed‐batch to in situ product recovery with fully integrated electrodialysis

MoO₃–TiO₂ synergy in oxidative dehydrogenation of lactic acid to pyruvic acid

Direct Ethanol Fuel Cell on Carbon Supported Pt Based Nanocatalysts

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Oxidation of propylene glycol and lactic acid to pyruvic acid in aqueous phase catalyzed by lead-modified palladium-on-carbon and related systems

Cited by 105 publications

References 10 publications

Process strategies to enhance pyruvate production with recombinant Escherichia coli: From repetitive fed‐batch to in situ product recovery with fully integrated electrodialysis

Process strategies to enhance pyruvate production with recombinant Escherichia coli: From repetitive fed‐batch to in situ product recovery with fully integrated electrodialysis

MoO3–TiO2 synergy in oxidative dehydrogenation of lactic acid to pyruvic acid

Direct Ethanol Fuel Cell on Carbon Supported Pt Based Nanocatalysts

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Product

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MoO₃–TiO₂ synergy in oxidative dehydrogenation of lactic acid to pyruvic acid