“…To reduce the extent of the RWGS reaction and optimize the catalyst’s effectiveness towards methanol formation (i.e., methanol selectivity, catalytic activity, and stability), in many cases, Cu is supported by other metallic/ceramic materials, mainly ZnO and Al 2 O 3 , as in commercial catalysts [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. While ZnO was shown as taking an active part in reaction promotion (sometimes referred as cocatalyst) [ 18 , 20 , 21 , 27 , 28 , 29 , 30 ], Al 2 O 3 is considered a chemically inert component that serves mainly as a stabilizer of Cu/ZnO particles dispersed in the catalyst [ 11 , 31 ].…”