Ethanol steam reforming: understanding changes in the activity and stability of Rh/MxOy catalysts as function of the support

Autor(es)

Rodrigues, Thenner S. ^{[1, 2]} ; e Silva, Felipe A. ^{[1, 2]} ; Candido, Eduardo G. ^[1] ; da Silva, Anderson G. M. ^[3] ; Geonmonond, Rafael dos S. ^[3] ; Camargo, Pedro H. C. ^[3] ; Linardi, Marcelo ^[1] ; Fonseca, Fabio C. ^[1]

Afiliação do(s) autor(es)

^[1] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, Av Prof Lineu Prestes 2242, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Fed Rio de Janeiro, COPPE, Alberto Luiz Coimbra Inst Grad Studies & Res Engn, Nanotechnol Engn Program, Av Horacio Macedo 2030, BR-21941972 Rio De Janeiro, RJ - Brazil

^[3] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Science; v. 54, n. 17, p. 11400-11416, SEP 2019.
• Citações Web of Science: 1

Resumo

We reported herein a systematic investigation on how the nature of the support affected the catalytic performances of Rh nanoparticles. The prepared catalysts were denoted as Rh/MxOy, where M corresponded to Ce, Ti, Si, Zn, and Al, and Rh was Rh3+ reduction to Rh nanoparticles on the surface of oxides. This strategy was performed in a single step using urea as a mediator and in the absence of any other stabilizer or capping agent. The Rh nanoparticles displayed relatively similar sizes, shapes, and uniform distribution over the supports, differing only in terms of the nature of the support. This strongly affected the metal-support interaction between Rh nanoparticles and the respective oxides, leading to significant differences in their catalytic performances toward the ethanol steam reforming. Here, not only the catalytic activity (in terms of ethanol conversion) was affected, but both the selectivity and stability were also influenced by the nature of the oxide support. Interestingly, the reaction paths as well as the deactivation profile were completely changed as function of the employed support. Such differences were associated with differences in the oxygen storage, oxygen mobility, and acidity/basicity of the supports. We believe that our results can contribute to the development and understanding of Rh-supported catalysts for the applications toward gas-phase transformations such as the ethanol steam reforming reaction. (AU)

• Processo FAPESP: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Beneficiário: Julio Romano Meneghini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 14/09087-4 - Estudos sobre o uso do bioetanol em células a combustível do tipo PEMFC e SOFC
• Beneficiário: Marcelo Linardi
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/26308-7 - Otimização das propriedades físico-químicas de materiais nano-estruturados e suas aplicações em reconhecimento molecular, catálise e conversão/armazenamento de energia
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/04929-5 - Desenvolvimento de catalisadores para obtenção de hidrogênio a partir do bioetanol
• Beneficiário: Thenner Silva Rodrigues
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado