Palladium decoration of hybrid carbon nanotubes/ch... - BV FAPESP
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Palladium decoration of hybrid carbon nanotubes/charcoal composite and its catalytic behavior in the hydrogenation of trans-cinnamaldehyde

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Autor(es):
Zana Ribeiro, Pedro Henrique [1] ; Matsubara, Elaine Y. [1] ; Rosolen, Jose Mauricio [1] ; Donate, Paulo Marcos [1] ; Gunnella, Roberto [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Quim, BR-14040901 Ribeirao Preto, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL; v. 410, p. 34-40, DEC 15 2015.
Citações Web of Science: 11
Resumo

In the present study, we addressed the palladium (Pd) decoration of multiwalled carbon nanotube (CNT)/activated carbon (AC) hybrid composites (MWCNT/AC), and examined the catalytic behavior of the composites in the hydrogenation of trans-cinnamaldehyde. The MWCNT/AC composites were prepared by growing CNT network on the surface of AC granules, using the chemical vapor deposition method. XPS analysis revealed that the MWCNT/AC and COOH-MWCNT/AC composites and isolated AC adsorbed Pd at different oxidation states when dipped into a Pd-0 microemulsion: isolated AC and the COOH-MWCNT/AC composite adsorbed Pd nanoparticles at di- and tetravalent states (Pd2+/4+), while the MWCNT/AC composite adsorbed Pd nanoparticles at zero and tetravalent states (Pd-0/Pd4+). The MWCNT/AC composite may thereby have hierarchical Pd adsorption properties dependent on the MWCNT network type grown onto the AC surface. Regarding the catalytic performance, the (Pe(0/4+))-MWCNT/AC catalyst displayed higher selectivity to hydrocinnamaldehyde formation (95.9%) when compared with the (Pd2+/4+)-AC and (Pd2+/4+)-00OH-MWCNT/AC catalysts (72.1% and 91.4% selectivity, respectively). The catalytic performance of the (Pd0/4+)-MWCNT/AC catalyst with 2.8 wt% of Pd loading was also superior than the catalytic performance of commercial catalysts with 5 and 10 wt% of Pd loading and other Pd/CNTs catalysts reported in the literature. (C) 2015 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 10/07681-5 - Desenvolvimento e estudo de materiais micro/nanoestruturados de interesse para baterias de íons de lítio e capacitores
Beneficiário:Jose Mauricio Rosolen
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 13/18254-9 - Uso de processos multicomponentes na síntese de novos compostos de interesse farmacológico
Beneficiário:Paulo Marcos Donate
Modalidade de apoio: Auxílio à Pesquisa - Regular