GUO Jianping¹, YI Xiaodong^1*, WU Zhongfang¹, HUA Weiqi², HUANG Chuanjing¹, WENG Weizheng¹, WAN Huilin¹

(1. State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China ; 2. Yantai Wanhua Polyurethanes Co., Ltd., Yantai, 264002, China)

Abstract: The effect of cesium loading on the performance of single-site (pseudotetrahedral monovanadate VO₄)VO_x/SBA-15 catalysts for propane oxidative dehydrogenation was investigated. The addition of Ce significantly improved the selectivity of propene which was enhanced by ~10 % at the same propane conversions. The catalysts were characterized by XRD, Raman, H₂-TPR, NH₃-TPD and FT-IR spectroscopy of pyridine adsorption. The results indicated that the addition of a small amount of cesium did not change the structure and reducibility of active centers but resulted in a decrease of Bronsted acid sites which favors propene desorption and prevents the overoxidation of propene to carbon oxides.

Key words: Propane; Oxidative dehydrogenation; Vanadia catalylsts; SBA-15; Cesium

E-mail: xdyi@xmu.edu.cn　  hlwan@xmu.edu.cn

Journal of Molecular Catalysis, Vol. 25, Issue 5, 2011, 415-420