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研究了焙烧温度对Ni/γ-Al2O3还原条件及催化甲苯水蒸气重整反应的影响。结果表明,焙烧温度对催化剂的还原条件及性能具有重要影响。700℃焙烧的催化剂在680℃的反应温度下表现出良好的反应性能,在不进行预还原的情况下仍保持了很高的催化活性及稳定性,其中,甲苯转化率达99%。并使用BET、XRD、TG-DTG等表征方法对反应前后的催化剂进行表征,随着焙烧温度的升高,催化剂比表面积降低、总孔容减小、平均孔径增大、镍与载体的结合程度逐渐增强、NiAl2O4含量逐渐增多,这是焙烧温度影响催化剂还原条件的主要原因。最后通过TEM、XPS对700℃焙烧的催化剂的结构进行了进一步的分析。
The effect of calcination temperature on Ni / γ-Al2O3 reduction conditions and catalytic steam reforming of toluene was investigated. The results show that the calcination temperature has an important influence on the reduction conditions and properties of the catalyst. The catalyst roasted at 700 ℃ showed good reactivity at the reaction temperature of 680 ℃ and maintained high catalytic activity and stability without prereduction. The conversion of toluene reached 99%. The catalysts were characterized by BET, XRD and TG-DTG before and after the reaction. As the calcination temperature increased, the specific surface area decreased, the total pore volume decreased, the average pore size increased, Gradually increased, NiAl2O4 content gradually increased, which is the main reason for the roasting temperature affect the catalyst reduction conditions. Finally, the structure of the catalyst calcined at 700 ℃ was further analyzed by TEM and XPS.