Effects of Co Addition to Supported Ni Catalysts on Hydrogen Production from Oxidative Steam Reforming of Ethanol

Autor(es)

Braga, Adriano H. ^{[1, 2]} ; Ribeiro, Mauro C. ^[3] ; Noronha, Fabio B. ^[4] ; Galante, Douglas ^[5] ; Bueno, Jose M. C. ^[2] ; Santos, Joao B. O. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Chem, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Chem Engn, CP 676, BR-13565905 Sao Carlos, SP - Brazil

^[3] Fed Fluminense Univ, Rua Des Hermydio Ellis Figueira 78, BR-27213145 Volta Redonda - Brazil

^[4] Natl Inst Technol INT, Catalysis & Chem Proc Div, Ave Venezuela 82, BR-20081312 Rio De Janeiro - Brazil

^[5] Brazilian Ctr Res Energy & Mat, Brazilian Synchrotron Light Lab, Rua Giuseppe M Scolfaro 10000, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENERGY & FUELS; v. 32, n. 12, p. 12814-12825, DEC 2018.
• Citações Web of Science: 0

Resumo

The effects of adding Co to a Ni/MgAl2O4 catalyst on activity and stability in the oxidative steam reforming of ethanol (OSRE) were investigated. The catalysts were prepared by impregnation and characterized by X-ray diffraction, N-2 physisorption, temperature-programmed reduction, transmission electron microscopy, and X-ray absorption near edge structure (XANES). The major products formed during the OSRE reaction at 500 degrees C were H-2, CO2, CO, and acetaldehyde, together with small amounts of CH4, ethylene, and acetone. The ethanol conversion was close to 100% with selectivity to H-2 around 55% for 4Co4Ni catalyst, and no deactivation was observed on this catalyst during 28 h of reaction. The oxidation and reduction of Ni and Co catalysts during OSRE reaction were studied by XANES. Initial deactivation during the OSRE reaction occurred due to metal oxidation during heating, and the catalysts became reduced again as the reforming reaction proceeded during heating at temperatures higher than about 500 degrees C. Greater addition of Co to Ni and smaller metal particle size favored metal oxidation during OSRE reaction. The presence of metal oxide on the surfaces of the metal nanoparticles promoted the oxidation of carbon on the metal surface, hence decreasing the rate of carbon accumulation. The results indicated that a stable and active catalyst for H-2 production by means of the OSRE reaction could be produced by combining appropriate amounts of Co and Ni and using metal particle sizes smaller than about 5 nm. (AU)

• Processo FAPESP: 11/50727-9 - Desenvolvimento de sistemas para produção de hidrogênio e para geração e utilização de energia eletro-química
• Beneficiário: Ernesto Rafael Gonzalez
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/10858-2 - Relação entre tamanho, composição e estrutura de nanopartículas de Co-Ni e sua influência sobre as propriedades catalíticas na reforma a vapor do etanol
• Beneficiário: Adriano Henrique Braga
• Modalidade de apoio: Bolsas no Brasil - Doutorado