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T. Imyen, W. Limphirat, G. Rupprechter, P. Kongkachuichay:
"Roles of ZnO in Cu/Core−Shell Al−MCM-41 for NO Reduction by Selective Catalytic Reduction with NH₃: The Effects of Metal Loading and Cu/ZnO Ratio";
ACS Omega, 4 (2019), 1077 - 1085.

Cu−ZnO/Al−MCM-41 catalysts were studied for NO_x reduction. The total metal loading was varied as 3, 5, and 7 wt %, whereas the Cu-to-ZnO ratio was fixed at 1:1. Too high metal loading led to lower reducibility of Cu²⁺, as CuO and ZnO covers on the catalyst surface could partially block pores and hinder gas molecules to access the Cu²⁺ ions. Subsequently, Cu loading was fixed at 2.5 wt %, whereas ZnO content was varied as 0, 2.5, and 3.5 wt %. The results demonstrated that 2.5Cu−2.5ZnO catalyst exhibits the best catalytic activity, as it gave the average NO conversion of 87%.

http://dx.doi.org/10.1021/acsomega.8b02741