Nanostructured Pd/C catalysts prepared by grafting of model carboxylate complexes onto functionalized carbon

Hermans, Sophie; Diverchy, Chantal; Demoulin, Olivier; Dubois, Vincent; Gaigneaux, Éric M.; Devillers, Michel

doi:10.1016/j.jcat.2006.07.019

Cited by 53 publications

(34 citation statements)

References 67 publications

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“…The constraints used for decomposition of the Pd 3d peak were as follows: imposing an area ratio Pd 3d 5/2 /Pd 3d 3/2 of 1.5, a difference in the binding energies (Pd 3d 3/2 –Pd 3d 5/2 ) of 5.26 eV, and for the Pd 3d 5/2 and Pd 3d 3/2 peaks the same FWHM 15a. 27a The constraints used for the decomposition of the C 1s peak is simply to use the same FWHM for the C (C,H), C O, and C OO components. A difference of 1.5 eV between the C O and C (C,H) components was imposed.…”

Section: Methodsmentioning

confidence: 99%

Calibration of the X‐Ray Photoelectron Spectroscopy Binding Energy Scale for the Characterization of Heterogeneous Catalysts: Is Everything Really under Control?

et al. 2013

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Investigations of X-ray photoelectron spectra from solid samples need corrections for the surface charging effect. For powder samples such as heterogeneous catalysts and their supports, the C(C,H) component of the C 1s peak is often used as an internal standard for the calibration of the binding energy scale. Although this method is widely recognized as suitable for the study of heterogeneous catalysts, we show that a significant calibration bias can be encountered upon comparing samples with different bulk composition. In this paper, a series of SiO2 -Al2 O3 supports and Pd/SiO2 -Al2 O3 catalysts with various Si/Al ratios were studied. The spectra issued from these samples were processed with the classical calibration method on the basis of the carbon peak. Important discrepancies in the relative position of the photoelectron peaks were noticed. After systematically discarding instrument-related issues, a true chemical influence of the bulk matrix on the analyzed surface specie... Document type : Article de périodique (Journal article) Référence bibliographiqueJacquemin, Marc ; Genet, Michel J. ; Gaigneaux, Eric M. ; Debecker, Damien P.. Calibration of the X-ray photoelectron spectroscopy binding energy scale for the characterization of heterogeneous catalysts: is everything really under control?.

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Section: Methodsmentioning

confidence: 99%

Calibration of the X‐Ray Photoelectron Spectroscopy Binding Energy Scale for the Characterization of Heterogeneous Catalysts: Is Everything Really under Control?

et al. 2013

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“…[19] [Pt(COD)Cl 2 ], [Au(PPh 3 )Cl] and H 2 CO were supplied by Sigma-Aldrich, H 2 NC 3 H 7 by Acros Organics, HPPh 2 by Fluka, and all were used as received. The activated carbon SXplus (noted as C SX+ ) support was supplied by Norit and C PPh 2 was prepared as described elsewhere [18,21] and summarized here. The starting carbon (C sx+ ), with S BET = 932 m 2 /g, was oxidized with HNO 3 (2.5 mol/L) to give C COOH (S BET = 701 m 2 / g).…”

Section: Methodsmentioning

confidence: 99%

“…dation and quantified by Boehm's titrations and XPS. [21] Then, the carboxylic acid groups were treated with SOCl 2 to transform them into acyl chlorides, before coupling them with ethylenediamine. The pendant amine functions were finally derivatized into chelating phosphanes by the concomitant action of HPPh 2 and CH 2 O.…”

Section: Anchoring and Activationmentioning

confidence: 99%

Anchoring of Ru–Pt and Ru–Au Clusters onto a Phosphane‐Functionalized Carbon Support

et al. 2011

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Two mixed-metal clusters, [Ru 5 PtC(CO) 14 (COD)] (1) and [Ru 6 Au 2 C(CO) 16 (PPh 3 ) 2 ] (2), were anchored onto a prefunctionalized active carbon support (C PPh 2 ) with chelating phosphane groups on its surface. These clusters were also deposited onto the unmodified support (C SX+ ) for comparison. The incorporation of 1 and 2 on both supports was studied by a combination of SIMS and XPS. When the clusters were anchored onto the functionalized carbon support, SIMS spectra displayed characteristic patterns that were different from those obtained in the case of their deposition on the unmodified support. In the latter case, spectra corresponded to the results obtained with pure unsupported clusters. XPS analyses of the supported species seemed to indicate that the stoichiometry of the clusters was retained after anchoring and that their dispersion was better on C PPh 2 than on C SX+ . This indicates that the phosphanes act as anchors for noble metal compounds through a ligand exchange mechanism. The sup-

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“…The preparation of supported palladium catalyst is widely reported [23][24][25][26][27], most of which are concerned with the preparation of Pd/C catalysts. In this work, the catalyst with a content of 5 wt % Pd-loading as reported in the literature [24] was prepared using H 2 PdCl 4 solution for the synthesis of vinyl benzoate.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Eco-environmental synthesis of vinyl benzoate through transesterification catalyzed by Pd/C catalyst

Gao¹,

Guan²,

Xu³

et al. 2018

Bull. Chem. Soc. Eth.

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The synthesis of vinyl benzoate via transesterification of vinyl acetate with benzoic acid was investigated by a carbon-supported palladium catalyst. The results showed that Pd (5 wt %)/C catalyst presented good catalytic and reusable performance instead of mercuric salts of strong acids. The conditions of the transesterification reaction for achieving high yields of vinyl benzoate were explored. The optimized conditions are as follows: reaction temperature, 80 o C, reaction time, 10 h, catalyst dosage, 4.0 wt % of reactants, and benzoic acid/vinyl acetate molar ratio, 1:11, respectively, and the yield of vinyl benzoate was 85.7% with the purity of 98.3%. Meanwhile, the prepared Pd/C catalyst could be recycled five times without significant decrease in activity after separating from the product mixture, and the vinyl benzoate yield is still more than 81%. Furthermore, the eco-environmental synthetic method offers great potential for the industrial scale synthesis of vinyl benzoate.

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Nanostructured Pd/C catalysts prepared by grafting of model carboxylate complexes onto functionalized carbon

Cited by 53 publications

References 67 publications

Calibration of the X‐Ray Photoelectron Spectroscopy Binding Energy Scale for the Characterization of Heterogeneous Catalysts: Is Everything Really under Control?

Calibration of the X‐Ray Photoelectron Spectroscopy Binding Energy Scale for the Characterization of Heterogeneous Catalysts: Is Everything Really under Control?

Anchoring of Ru–Pt and Ru–Au Clusters onto a Phosphane‐Functionalized Carbon Support

Eco-environmental synthesis of vinyl benzoate through transesterification catalyzed by Pd/C catalyst

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