Production of acetic acid from ethanol over CuCr catalysts via dehydrogenation-(aldehyde–water shift) reaction

Xiang, Ning; Xu, Peng; Ran, Nianbo; Ye, Tongqi

doi:10.1039/c7ra05922a

Cited by 20 publications

(15 citation statements)

References 35 publications

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“…The scope of the AWS reaction on the optimized NCZA‐33 catalyst was subsequently extended to some homologues of aldehydes and alcohols and the results are summarized in Table 3. Consistent with the prior research, [3d] alcohols showed relatively high conversion but low carboxylic acid selectivity, for the intermediate product of aldehyde is more likely spreading to gas phase than performing in the AWS reaction. As a good hydrogenation element, Cu‐based catalyst is also active in dehydrogenation, so that the alcohols showed high conversion to the corresponding aldehyde.…”

Section: Resultssupporting

confidence: 88%

“…1). When in the AWS reaction, one proton in water is to form molecular hydrogen while the hydroxyl group is incorporated into the carboxyl group [3d] . With using soft oxidants, reaction could be more gently thus selectivity of target product be enhanced.…”

Section: Introductionmentioning

confidence: 99%

“…proposed the AWS reaction as a step of heptanal ketonization involved oxygen vacancies on the CeO 2 catalyst [5] . Our group reported the soft oxidation of ethanol to produce acetic acid over CuCr catalyst [3d] . The oxidation is suggested to comprise of two continuous steps, namely the AWS reaction of acetaldehyde after the dehydrogenation of ethanol.…”

Section: Introductionmentioning

confidence: 99%

“…Both Cu and Ni are active elements for reactions that involve hydrogen, thus it's reasonable to expect better performance for their hybrids. AWS is such an interesting reaction that Cu is much more active than other transition metals even noble metals, and promoters may play an important role in the enhancement of activity or selectivity [3d,6] . In this paper, we describe exploration of the AWS reaction using propanal as model compound on Ni modified Cu−Zn−Al catalysts to make further understanding of structure‐function relationships and the promoting effects of Ni.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation of Bio‐Aldehyde and Bio‐Alcohol to Carboxylic Acid by Water over Modified CuZnAl Catalysts

Bao

et al. 2021

ChemistrySelect

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A series of NiCuZnAl catalysts with various Cu/Ni molar ratios and XCuZnAl (X=Ni, Co, Mn, Mg, La) catalysts were prepared and used in the aldehyde‐water shift (AWS) reaction with propanal as model compound. Although copper is the main site for AWS reaction, some additives also showed some effects on enhancing the catalytic activity to varying degrees. Mn promoted catalyst showed the highest propanal conversion of 22 % at 260 °C, much better than Co, La etc. Among the Ni promoted catalysts, NCZA‐33 with Ni/(Ni+Cu) molar ratio of 33 % showed the best activity. The trend of activity happened to match the catalyst reducibility expressed by reduction peak temperature in TPR analysis, thus an MVK mechanism was suggested. Introduction of Ni decreases the proportion of Cu0/Cu+ in surface Cu species, thus suppressed the hydrogenation activity and decreased the selectivity of corresponding alcohols. The carboxylic acid selectivity increased from 86.3 % of pristine CuZnAl to more than 90 % on modified catalysts, even 99.6 % on NCZA‐83 catalyst. Both pristine and modified CuZnAl catalysts showed good stability under AWS reaction conditions and carbon deposition is not responsible for the deactivation. AWS reaction was also extended to other aliphatic aldehydes and alcohols, but it's invalid for furfural and Cinnamaldehyde under the employed reaction conditions. The results indicate AWS reaction is very sensitive to the nature of reactants.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidation of Bio‐Aldehyde and Bio‐Alcohol to Carboxylic Acid by Water over Modified CuZnAl Catalysts

Bao

et al. 2021

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“…Pt + Al2O3| Pd + C − −−−−−−−−−−−−−− → SM2 SCMAWilcox et al (2003) 11 CA Ethanol + H2O CuCr − −−−→ SM2 + 2 H2 SCMAXiang et al (2003) FTT: Fischer-Tropsch-type, NC: Non-catalytic, CA: Catalytic. PAH: polycyclic aromatic hydrocarbon.…”

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confidence: 99%

Meteoritic abundances of fatty acids and potential reaction pathways in planetesimals

Lai

Pearce

Lee

2019

Icarus

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The origin of fatty acids on the prebiotic Earth is important as they likely formed the encapsulating membranes of the first protocells. Carbon-rich meteorites (i.e., carbonaceous chondrites) such as Murchison and Tagish Lake are well known to contain these molecules, and their delivery to the early planet by intense early meteorite bombardments constitutes a key prebiotic source. We collect the fatty acid abundances measured in various carbonaceous chondrites from the literature and analyze them for patterns and correlations. Fatty acids in meteorites include straight-chain and branchedchain monocarboxylic and dicarboxylic acids up to 12 carbons in length-fatty acids with at least 8 carbons are required to form vesicles, and modern cell membranes employ lipids with ∼12-20 carbons. To understand the origin of meteoritic fatty acids, we search the literature for abiotic fatty acid reaction pathways and create a candidate list of 11 reactions that could potentially produce these fatty acids in meteorite parent bodies. Straight-chain monocarboxylic acids (SCMA) are the dominant fatty acids in meteorites, followed by branched-chain monocarboxylic acids (BCMA). SCMA are most abundant in CM2 and Tagish Lake (ungrouped) meteorites, ranging on average from 10 2 ppb to 4×10 5 ppb, and 10 4 ppb to 5×10 6 ppb, respectively. In CM, CV, and Tagish Lake meteorites, SCMA abundances generally decrease with increasing carbon chain length. Conversely, SCMA abundances in CR meteorites peak at 5 and 6 carbons in length, and decrease on either side of this peak. This unique CR fatty acid distribution may hint at terrestrial contamination, or that certain fatty acid reactions mechanisms are active in different meteorite parent bodies (planetesimals). We identify Fischer-Tropsch-type synthesis as the most promising pathway for further analysis in the production of fatty acids in planetesimals.

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Catalytic Transformation of Ethanol to Industrially Relevant Fine Chemicals

Rana¹,

Parikh

2020

Biorefinery of Alternative Resources: Targeting Green Fuels and Platform Chemicals

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Production of acetic acid from ethanol over CuCr catalysts via dehydrogenation-(aldehyde–water shift) reaction

Cited by 20 publications

References 35 publications

Oxidation of Bio‐Aldehyde and Bio‐Alcohol to Carboxylic Acid by Water over Modified CuZnAl Catalysts

Oxidation of Bio‐Aldehyde and Bio‐Alcohol to Carboxylic Acid by Water over Modified CuZnAl Catalysts

Meteoritic abundances of fatty acids and potential reaction pathways in planetesimals

Catalytic Transformation of Ethanol to Industrially Relevant Fine Chemicals

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