【摘要】 将不同物化性质的HZSM-5作为甲烷无氧芳构化反应催化剂的载体,系统研究了载体性质对反应的影响.研究发现,不同硅铝物质的量比的HZSM-5担载Mo催化剂具有不同的催化反应性能,在一定硅铝物质的量比范围内,随着硅铝物质的量比的降低,HZSM-5酸量增加,甲烷无氧芳构化反应甲烷转化率提高,表明HZSM-5对该反应起酸催化作用,载体的酸性质是影响反应性能的主要因素.而HZSM-5结晶度对甲烷无氧芳构化反应影响不大.更多还原

【Abstract】 The effects of support properties on catalytic performance of Mo/HZSM5 in methane nonoxidative aromatization are studied. Catalytic performance of 6% Mo/HZSM5 catalysts with different n(SiO2)/n(Al2O3), which are characterized by XRD, XRF, NH3TPD and BET, is investigated. It is found that, the lower n(SiO2)/n(Al2O3) is, the stronger the acidity of HZSM5 is and the higher the conversion rate of methane is. There is a close correlation between the activity and the acidity of HZSM5. It is suggested that HZSM5 is not only the support of catalyst, but also plays an acid catalytic role. Catalytic performance of 6% Mo/HZSM5 with the same n(SiO2)/n(Al2O3) but different crystallinity is also tested. The results show that crystallinity does not significantly affect the catalytic performance. Therefore, the catalytic performance of Mo/HZSM5 for methane nonoxidative aromatization doesn′t mainly depend on crystallinity, but acidity of support.更多还原