Limin Shi1*, Wei Chu2
(1Xi’an Technological University, Xi’an 710032, China, 2 Sichuan University, Chengdu 610065, China)
Abstract: CuCo-based catalysts for CO hydrogenation to higher alcohols were prepared by the ultrasound assisted reverse coprecipitation. Effects of transition elements (Zn, Mo) on the structure and catalytic performance were investigated. The catalysts were characterized by means of X-ray diffraction (XRD), N2 adsorption isotherm (BET), temperature-programmed reduction (H2-TPR) and temperature-programmed desorption (CO-TPD) techniques. The specific surface areas of the experimental catalysts were increased while the crystallite sizes were decreased by the addition Zn and Mo without changing the Cu-Co spinel crystal structure. For the Zn contained catalyst, the increase of specific surface area was limited and amount of adsorbed CO-species was decreased. Both CO conversion and alcohol yield were reduced. For the Mo promoted sample, the specific surface area was increased obviously. Meanwhile, the dispersion of copper and cobalt was promoted and the reducibility was improved. As a result, the hydrogenation ability, CO conversion and alcohol yield were increased significantly. With the addition of Zn and Mo, the contents of methanol in mixed alcohols were increased comparing with that of CuCo oxides.
Key words: CuCo-based Catalysts; Higher Alcohols; Transition Element; Catalytic Properties
E-mail: lmshi@xatu.edu.cn
Journal of Molecular Catalysis, Vol. 25, Issue 4, 2011, 316~321
