Effect of the Pt Precursor and Loading on the Structural Parameters and Catalytic Properties of Pt/Al2O3

Autor(es)

Borges, Lais R. ^[1] ; Lopez-Castillo, Alejandro ^[2] ; Meira, Debora M. ^[1] ; Gallo, Jean Marcel R. ^[2] ; Zanchet, Daniela ^[3] ; Bueno, Jose Maria C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Chem Engn, Rod Washington Luis S-N, Km 235, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Chem, Rod Washington Luis S-N, Km 235, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Estadual Campinas, Inst Chem, Rod Washington Luis S-N, Km 235, POB 676, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CHEMCATCHEM; v. 11, n. 13, p. 3064-3074, JUL 4 2019.
• Citações Web of Science: 0

Resumo

The effects of promoters and additives on the electronic properties and structural properties of Pt catalysts still need to be understood. The present work investigates the effects of the Pt loading and the use of chloride additive on the structural properties of Pt/Al2O3 and its catalytic activity towards the WGS reaction. The presence of Cl affected the morphology and oxygen coverage of the Pt nanoparticles. However, these parameters did not affect the surface electronic properties, due to a compensation effect between the size of the Pt-0 core and oxygen coordinated on the shell (NPt-O). Despite the structural differences, the catalytic activity for the WGS reaction was similar for the chloride-free sample and the catalyst containing chloride. The effect of the Pt loading was also studied, with the ``apparent{''} catalytic activity per site of Pt (TOF) decreasing with increasing metal loading. Increasing the Pt loading led to an increase of the low-coordination Pt-0 sites at the surface of the NPs, resulting in stronger Pt-CO integration and consequent poisoning of the active sites. (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: 10/11385-2 - Estudo teórico de sistemas químicos
• Beneficiário: Alejandro López Castillo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/02128-2 - Desenvolvimento de novos sistemas catalíticos para a biorrefinaria
• Beneficiário: Jean Marcel Ribeiro Gallo
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 12/00567-8 - Estudo mecanístico da oxidação preferencial do CO associado à caracterização in situ de catalisadores heterogêneos
• Beneficiário: Diego Silva Paz
• Modalidade de apoio: Bolsas no Brasil - Doutorado