摘要
利用几种常见的液态烃作为碳源对MoO3/Al2O3进行了程序升温碳化(TPC),通过在线质谱(MS)的跟踪分析以及对所得催化剂的XRD表征,研究了这些烃在TPC过程中对MoO3/Al2O3物相转变的影响以及这些烃在不断转化催化剂表面的化学行为.结果显示在不同温度范围内这些烃具有不同的碳化活性,对MoO3/Al2O3的完全碳化来说,正己烷表现出了最好的活性.TPC-MS的分析结果也见证了MoO3/Al2O3碳化时的中间物相及其对链烃的脱氢芳构化作用,这对于不同用途的钼基碳化物催化剂制备时合适碳源的选择极具参考意义.
The temperature programmed carburization （TPC） of MoO3/A1203 was performed using liquid hydrocarbons as carbon sources. The effect of these hydrocarbons on the phase transformation of MoO3/AI2 03 during TPC and the catalysts 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 showed that different hydrocarbons had 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 catalysts 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.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2010年第1期45-50,共6页
Journal of Molecular Catalysis(China)
