活性氢物质甲醇存在时噻吩在La/HZSM-5催化剂上的转化反应研究

探讨了在含活性氢的醇存在时,以La改性的HZSM-5分子筛为催化剂,噻吩在固定床微型反应器中的转化反应。考察了反应温度、甲醇含量、La负载量、质量空速等因素对反应的影响。实验结果表明,在反应温度623K以上、甲醇与溶剂苯的体积比为1∶2、La负载量(质量分数)1.0%、质量空速14h-1时,噻吩转化率和硫化氢产率分别达到最大值51.3%和18.1%。与未负载La的HZSM-5催化剂相比,负载La的HZSM-5催化剂催化的噻吩转化反应,噻吩转化率和硫化氢产率分别提高36.0%和11.6%。

Study on Conversion of Thiophene over La/HZSM -5 Catalyst in Presence of Activated Hydrogen Substance- Methanol

Catalytic desulfurization of thiophene over HZSM-5 and La-modified HZSM-5 catalysts in fixed bed microreactor were studied in presence of activated hydrogen substance-methanol.Conversion of thiophene and yield of hydrogen sulfide were more than 51% and 18% respectively when reaction temperature was more than 623 K.Appropriate volume ratio of methanol to solvent benzene was 1∶2.La-modified HZSM-5 molecular sieve could increase conversion of thiophene and yield of hydrogen sulfide, and the optimal results,51.3% thiophene conversion and 18.1% hydrogen sulfide yield, could be obtained on catalyst modified with 1.0% La when mass hourly space velocity was 14 h -1.Thiophene conversion and hydrogen sulfide yield on La-modified HZSM-5 catalyst were 36.0% and 11.6% higher respectively than on HZSM-5 catalyst.