Decomposition of acetic acid for hydrogen production over Pd/Al 2 O 3 and Pd/TiO 2 : Influence of metal precursor

Esteves, Laura M.; Brijaldo, María H.; Passos, Fábio B.

doi:10.1016/j.molcata.2016.02.001

Cited by 35 publications

(23 citation statements)

References 53 publications

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“…1). Adopting earlier recommendations as to the assignment of these peaks (Matam et al 2012;Esteves et al 2016) we ascribe the low temperature and high temperature TPR peaks to reduction of more easily and strongly with support interacting PdO species, respectively. However, for reduction of the monometallic, Pd100(acac), the first TPR peak (at ~ 120 °C) was distorted by a negative feature, most probably associated with the decomposition of a palladium hydride phase (Fig.…”

Section: Catalyst Characterizationmentioning

confidence: 98%

n-Hexane conversion on γ-alumina supported palladium–platinum catalysts

et al. 2019

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Two series of Pd-Pt/Al 2 O 3 catalysts, characterized by high metal dispersions were prepared and investigated in the reaction of n-hexane conversion at the temperature < 300 °C. Incipient wetness co-impregnation of γ-alumina with the solutions of Pd(acac) 2 and Pt(acac) 2 led to relatively good Pd-Pt alloying. However, a similar catalyst preparation using solutions of PdCl 2 and H 2 PtCl 6 resulted in unsatisfactory homogenization; furthermore, significant amounts of chlorine were retained in the catalysts. The Pd-Pt alloy homogeneity has a significant effect on the relations of catalytic activities and product selectivities with Pd-Pt alloy composition. The relationship between the catalytic activity of chlorine-free Pd-Pt/Al 2 O 3 catalysts and bulk Pd-Pt composition matches the accepted relation between the surface composition and bulk composition of Pd-Pt, reflecting a high surface enrichment in palladium. In contrast, for the chloride series of Pd-Pt/Al 2 O 3 , variations of the turnover frequency are directly correlated with the bulk composition, indicating that unalloyed, more active, Pt particles decide about the catalytic behavior. Pd/Al 2 O 3 shows better than Pt/Al 2 O 3 selectivity for isomerization, especially after reduction at higher temperatures, ≥ 500 °C. On alloying with Pt, for the Cl-free series the isomerization selectivity was very high for nearly all bimetallic catalysts and showed a synergistic effect for 20 at.% Pt. In contrast, for the Cl-containing series, the isomerization selectivity was proportional to the palladium content. The effect of reduction temperature on the isomerization propensity of Cl-containing Pd-Pt/Al 2 O 3 catalysts was rather small, suggesting that possible variations in support acidity associated with chloride presence do not have large catalytic consequences, confirming the metal-only catalytic action in alkane isomerization carried out at the temperatures below 300 °C. Keywords Pd-Pt/Al 2 O 3 • n-Hexane hydroconversion • Selectivity for isomerization • Effect of alloying • Effect of reduction temperature This article belongs to S.I. ISSHAC10, but it reach the press at the time the special issue was published.

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Section: Catalyst Characterizationmentioning

confidence: 98%

n-Hexane conversion on γ-alumina supported palladium–platinum catalysts

et al. 2019

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“…In addition, the selectivity of the reported methods mostly is poor due to the formation of Kolbe- and Hofer–Moest-byproducts. 22,23…”

Section: Introductionmentioning

confidence: 99%

Hydrocarbon Synthesis via Photoenzymatic Decarboxylation of Carboxylic Acids

et al. 2019

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A recently discovered photodecarboxylase from Chlorella variabilis NC64A (CvFAP) bears the promise for the efficient and selective synthesis of hydrocarbons from carboxylic acids. CvFAP, however, exhibits a clear preference for long-chain fatty acids thereby limiting its broad applicability. In this contribution, we demonstrate that the decoy molecule approach enables conversion of a broad range of carboxylic acids by filling up the vacant substrate access channel of the photodecarboxylase. These results not only demonstrate a practical application of a unique, photoactivated enzyme but also pave the way to selective production of short-chain alkanes from waste carboxylic acids under mild reaction conditions.

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“…An egative peak at 78 8Ca nd ab road positive peak (90~168 8C) are observed for Pd/TiO 2 -N, which could correspond to H 2 desorption from Pd nanoparticles and the reduction of the in-core oxidized Pd, respectively. [31,33,45] Similarly, as mall negative peak at 78 8Ca nd as imilarb road peak between 88 and 168 8Ca re found fort he Pd&Bi(1.4)/TiO 2 -N catalyst. From the results of compoundsw ith the same Pd loading but different H 2 release and consumption amounts (Table S3), it is reasonable to assume that some of the PdO speciesi sr educed during the flow of H 2 at room temperature,w hich adsorbs some H 2 and releases it during temperature-programmed desorption (TPD) below 100 8C.…”

Section: Resultsmentioning

confidence: 70%

Promoting Effect of Bismuth Oxide on Palladium for Low‐Temperature Carbon Monoxide Oxidation

Ding

Huang

et al. 2017

ChemCatChem

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By using a modified coimpregnation method, a multicomponent Pd&Bi(1.4)/TiO2‐N catalyst with hierarchical metal–metal oxide interfaces was prepared that showed a better activity and stability for low‐temperature CO oxidation than Pd/TiO2‐N and Pd/P25. The structural characterization and catalytic activity results proved that an appropriate amount of Bi species has a clear promoting effect on the Pd‐based catalyst. Particularly, the catalyst can be mass‐produced conveniently, which may be beneficial for versatile reactions and practical applications.

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Decomposition of acetic acid for hydrogen production over Pd/Al 2 O 3 and Pd/TiO 2 : Influence of metal precursor

Cited by 35 publications

References 53 publications

n-Hexane conversion on γ-alumina supported palladium–platinum catalysts

n-Hexane conversion on γ-alumina supported palladium–platinum catalysts

Hydrocarbon Synthesis via Photoenzymatic Decarboxylation of Carboxylic Acids

Promoting Effect of Bismuth Oxide on Palladium for Low‐Temperature Carbon Monoxide Oxidation

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