Stepwise conversion of methane to methanol on Cu and Fe/zeolites prepared in solid state: the effect of zeolite type and activation temperature
Artikel i vetenskaplig tidskrift, 2023

BACKGROUND: Grand efforts have been recently devoted to the development of catalysts based on the excellent performance of Cu- and Fe-dependent enzymes in methanotrophic bacteria for the partial oxidation of methane to methanol under ambient conditions. As a continuation of the study on the stepwise manner for this conversion over zeolite-based catalysts, in this work, the effects of zeolite topology and activation temperature on the catalytic performance of Cu- and Fe-containing zeolites were investigated. RESULTS: Cu species exchanged in the medium-pore zeolites (mordenite, ZSM-5, and ferrierite) afforded better methanol production, while large-pore zeolites (zeolite β and zeolite γ) were inappropriate to accommodate active Cu sites. Notably, Cu/silicalite-1 containing CuO species was also reactive to methane after the activation in O2, yielding a minor methanol amount. Furthermore, the activity of Fe/mordenite towards the methanol in the O2-assisted procedure was reported for the first time but with a much lower yield as compared to that of Cu/mordenite. The methanol yield over Cu/mordenite increased with the activation temperature because increasing the activation temperature favored the Cu-exchange degree with a higher priority at the side pockets as compared to the main channels of mordenite, as evidenced from infrared analysis. CONCLUSION: The selective oxidation of methane to methanol by O2 via a stepwise manner can be obtained over both ion-exchanged Cu species and well-dispersed CuO nanoparticles with better activity being recorded for the former. The activity of Cu-exchanged zeolites was considerably dependent on the zeolite topology and the charge-balancing position of the Cu2+ cations.

Fe/zeolite

Cu/zeolite

methane-to-methanol conversion

stepwise manner

solid-state ion exchange

Författare

Ha V. Le

Ho Chi Minh City University of Technology - HCMUT

Vietnam National University

Hoang Phuoc Ho

Chalmers, Kemi och kemiteknik, Kemiteknik

Annette Trunschke

Max-Planck-Gesellschaft

Reinhard Schomäcker

Technische Universität Berlin

Arne Thomas

Technische Universität Berlin

Journal of Chemical Technology and Biotechnology

0268-2575 (ISSN)

Vol. In Press

Ämneskategorier

Oorganisk kemi

Annan kemiteknik

Organisk kemi

DOI

10.1002/jctb.7342

Mer information

Senast uppdaterat

2023-03-17