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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 carbonization (TPC) of MoO3 / Al2O3 with several common liquid hydrocarbons as the carbon source was investigated. By means of on-line mass spectrometry (MS) trace analysis and XRD characterization of the obtained catalysts, / Al2O3 phase transitions and the chemical behavior of these hydrocarbons on a continuously changing catalyst surface.The results show that these hydrocarbons have different carbonation activity at different temperature ranges and n-hexane exhibits the most complete carbonation for MoO3 / Al2O3 Good activity.The analysis results of TPC-MS also witnessed the intermediate phase and the dehydroaromatization of the chain hydrocarbon during the carbonization of MoO3 / Al2O3, which is a suitable carbon source for preparing the molybdenum-based carbide catalyst for different purposes The choice of great reference.