| Texto completo | |
| Autor(es): |
Arpini, Bruno H.
;
Braga, Adriano H.
;
Borges, Lais R.
;
Vidinha, Pedro
;
Goncalves, Renato, V
;
Szanyi, Janos
;
Rossi, Liane M.
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACS SUSTAINABLE CHEMISTRY & ENGINEERING; v. 10, n. 7, p. 12-pg., 2022-02-21. |
| Resumo | |
Controlling the selectivity of CO2 hydrogenation is a challenge for the application of earth-abundant-based metal catalysts. Herein, we show that a high-temperature pyrolysis protocol can be applied to prepare a nickel catalyst embedded in Ndoped carbon (Ni@NC), which provides an enhanced selectivity to CO in the nickel-catalyzed CO2 hydrogenation reaction under atmospheric pressure. The nitrogen-containing carbon overlayer was obtained through controlled pyrolysis of the nickel-1,10-phenanthroline complex impregnated on SiO2. The Ni@NC/SiO2 catalyst is more selective for CO, following the reverse water-gas shift reaction pathway, while an analogous "naked" Ni catalyst was more selective toward CH4, following the CO2/CO complete hydrogenation pathway. Although the Ni@NC/SiO2 catalyst has larger particle sizes than the naked Ni/SiO2 catalyst, the binding strength of CO to the Ni@NC surface is significantly weaker. Consequently, the CO intermediate easily desorbs instead of being converted into methane. Hence, selectivity toward CO, which is an important intermediate to methanol and C2+ products, or CH4 can be modulated by a simple modification of the Ni surface through controlled carbon deposition. (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 Aplicada |
| Processo FAPESP: | 17/02317-2 - Interfaces em materiais: propriedades eletrônicas, magnéticas, estruturais e de transporte |
| Beneficiário: | Adalberto Fazzio |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |