Autores: Sayago-Carro, R; Gómez-Cerezo, MN; Fernández-García, M; Kubacka, A
Artículo.
J. Clean Prod.. vol: 429. page: 0959-6526.
Fecha: DEC 1. 2023.
Doi: 10.1016/j.jclepro.2023.139542.
Resumen:
In this research, composite catalysts based on mixtures of titanium and cobalt oxides were synthesized and tested in the thermo-photo reduction of carbon dioxide. The cobalt loading varied between 2% and 8 M %, providing an outstanding activity in the selective production of carbon monoxide through the reverse water gas reaction. The sample doped with 4% Co optimized catalytic performance, with an excess over the photo and thermo alone processes above 27 % and an energy efficiency of 1.1 %. These values indicate that the sample displays the top performance reported so far. A physico-chemical characterization of the catalysts was also carried out showing that nearly amorphous cobalt (II) oxide entities are embedded within nanocrystalline anatase nanoplatelets within an inverse-type configuration. The use of in-situ infrared provides conclusive evidence that the promotion of the catalytic performance under dual excitation is intimately linked with the formation and evolution of formate-type species at the catalyst surface. A novel dual-excitation catalytic process using novel composite CoOx-TiO2 catalysts would open new ways for the energy-efficient elimination and valorization of carbon dioxide..