Abstract: Understanding methane activation pathways on Zn-modified high silica zeolites (ZSM-5, BEA) is of particular importance due to the possibility of methane involvement in co-aromatization with higher alkanes on this type of zeolites. The ability of zinc sites of different nature, either small zinc oxide (ZnO) clusters or isolated Zn2+ cations, to promote the activation of methane C–H bond with the zeolite Brønsted acid sites (BAS) has been examined in the reactions of methane H/D hydrogen exchange with BAS and the alkylation of benzene with methane. It has been found that both ZnO and Zn2+ species promote the reaction of H/D exchange of methane with BAS. It is revealed however that only Zn2+ cations promote the alkylation of benzene with methane, whereas ZnO species do not. Hence, while both ZnO clusters and Zn2+ cations are able to provide synergistic effect for the activation of C–H bonds of methane, only the Zn2+ cations perform methane activation toward the alkylation of benzene with methane. This implies that only the Zn2+ cations in Zn-modified zeolite can activate methane for the reaction of methane co-aromatization with higher alkanes

Cite: Stepanov A.G. , Gabrienko A.A. , Arzumanov S.S. , Freude D.
Which Species Zn2+ Cations or ZnO Clusters are Efficient for Methane Activation on Zn-Modified Zeolite
In compilation 13th European Congress on Catalysis. 2017.

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