ZHONG Liding, WU Yujin, WANG Li*, GUO Yun
(Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China)
Abstract:
The Pd supported catalysts were prepared by the deposition precipitation method, and the oxidations of CO and C3H8 were used as model reactions to investigate the influence of CoOx introduction on the reaction performance of Pd/Al2O3 and Pd/CeO2. The physical structure, chemical state and oxidation-reduction performance of the catalysts were characterized by a variety of characterization methods, and in situ DRIFTS was applied to explore the promotion mechanism of CoOx introduction on the oxidation reaction.The results showed that the reaction rate of Pd/CoOx/CeO2 to C3H8 oxidation was 2.7 times that of Pd/CeO2, and the reaction rate of Pd/CoOx/Al2O3 to CO oxidation was 2 times that of Pd/Al2O3. The promotion effects of CoOx on oxidation reaction were closely related to the redox properties of the carriers and the reactants, and its promotion mechanisms for CO and C3H8 oxidation were different. The introduction of CoOx changed the chemical state of Pd during CO oxidation reaction, whereas enhanced the adsorption of C3H8 and affected the stability of intermediate oxidation species on the catalyst surface during C3H8 oxidation reaction.
KeyWords:
Pd；CoOx；CO oxidation；C3H8 oxidation
