Direct methane to methanol stepwise conversion over Cu-oxo species in zeolites - Insights on the Cu-zeolite activation in air or helium from in situ UV-Vis analyses

Autor(es)

Passini, Ricardo J. ; Picinini, Monize ; Bueno, Jose Maria C. ; Urquieta-Gonzalez, Ernesto A.

• Tipo de documento: Artigo Científico
• Fonte: MOLECULAR CATALYSIS; v. 530, p. 13-pg., 2022-08-18.

Resumo

Among the plentiful scientific research focused to find new routes to substitute stronger unsustainable chemical processes, the direct conversion (DC) of methane to methanol (MTM) over exchanged Cu-oxo cations in zeolites has gained great attention. Within that process, the paper proposed that the first activation step of the Cu-zeolite to catalyze the cycling DC-MTM be done with air instead industrial oxidant gases. Thus, Cu-oxo exchanged ferrierites, as model Cu-zeolites, were prepared and evaluated in the DC-MTM at 210 oC. XRD, SEM/EDS, H2-TPR, FTIR of in situ adsorbed CO and pyridine were used to characterize the activated Cu-ferrierites. In situ DRS-UV-Vis evidenced the generation of Cu-oxo species after activation in air or He and their subsequent consumption during methane reaction. The air and He-activated Cu-ferrierites showed a close catalytic behavior that was supported by their similar profile to the formed Cu-oxo clusters. Thus, being more environmentally friendly to select air as an activation agent, instead of the use of pure O-2, inert gases, or even N2O. (AU)

• Processo FAPESP: 18/01258-5 - Novos processos catalíticos e fotocatalíticos para a conversão direta de metano e CO2 em produtos
• Beneficiário: José Maria Correa Bueno
• Modalidade de apoio: Auxílio à Pesquisa - Temático