ZHU Quan-li; ZHANG Qiu-lin; YANG Xiao-bin; KE Dong-xian; CHEN Qi-feng

Abstract: The temperature programmed carburization (TPC) of MoO₃/Al₂O₃ was performed using liquid hydrocarbons as carbon sources. The effect of these hydrocarbons on the phase transformation of MoO₃/Al₂O₃ during TPC and the catalyses of its intermediate phases to the reactions of these hydrocarbons were investigated using online mass pectrometer (MS). The results of X-ray diffraction (XRD) and TPC-MS show that different hydrocarbons have different activities for the transformation of MoO₃/Al₂O₃ within different temperature ranges. With regard to TPC of MoO₃/Al₂O₃, n-hexane was demonstrated to be the most effective among these hydrocarbons examined in our experiments. Also, some catalyses of intermediate phases formed during TPC were observed. These results provide valuable reference for choosing the suitable carbon sources and controlling preparation parameters properly in order to obtain the molybdenum carbide-based catalyst for different purposes.

Keywords: Molybdenum carbide; TPC; MS; XRD

E-mail: qlzhstc@sina.com

Journal of Molecular Catalysis, Vol. 24, Issue 1, 2010, 45~50