LAUSR

Abstract A series of CuO-ZnO-Al 2 O 3 -Li 2 O catalysts with various Al 2 O 3 /Li 2 O mass ratios were prepared by co-precipitation method and characterized by several techniques such as XRD, N 2 adsorption, SEM/EDX, reactive N 2 O adsorption, XPS/XAES, H 2 -TPR, H 2 -TPD, and CO-TPD. The results revealed that the specific surface area ( S BET ), dispersity of Cu species, metallic Cu surface area ( S Cu ) and adsorption capacity for reactants (H 2 and CO) were increased by the addition of suitable amount of Li 2 O to the CuO-ZnO-Al 2 O 3 catalyst, thus enhancing the catalytic activity of the hybrid catalyst composed of CuO-ZnO-Al 2 O 3 and HZSM-5 for the direct synthesis of dimethyl ether from biomass-derived gas. Furthermore, the addition of Li 2 O significantly improved the stability of CuO-ZnO-Al 2 O 3 catalyst due to the effective inhibition of the crystallization of Cu and ZnO.