在La改性HZSM-5分子筛上甲醇对噻吩转化反应规律的影响

Study on the Effect of Methanol on the Transformation Reaction of Thiophene over HZSM-5 Zeolite

探讨了在HZSM-5(硅铝摩尔比为25)分子筛催化剂上,甲醇对噻吩在固定床微型反应器中催化脱硫转化反应规律的影响.研究结果表明:反应温度只有达到623 K时,噻吩才有较大的转化反应,此时噻吩转化率达到了51%以上;含活性氢物质甲醇的浓度是甲醇与溶剂苯的体积比为1∶2;掺镧的HZSM-5催化剂对噻吩的催化转化有较大的促进作用,掺镧量为1.0%时噻吩的转化率和硫化氢的产率分别达到了51.3%、18.1%,与未掺镧的HZSM-5分子筛催化剂相比,噻吩的转化率和硫化氢的产率分别提高了36.0%、11.9%;质量空速对噻吩催化转化的影响主要体现在影响噻吩在催化床层上的停留时间,质量空速为14.h-1比较合适.

The catalytic desulfurization rule of model organic compound thiophene over HZSM-5 （molar ratio of silica-to-alumina is 25） in the presence of activated hydrogen substance was studied in fixed bed micro-reactor. The experimental results showed that there was more than 51% conversion of thiophene and more than 18% hydrogen sulfide yield at the temperature of more than 623 K. The appropriate volume ratio of activated hydrogen substance methanol and benzene solvent was 1 ： 2. The La modified HZSM-5 zeolites could accelerate the catalytic conversion of thiophene and the modified 1.0% La could gain preferable results （51.3% thiophene converseon and 18, 1% hydrogen sulfide yield）. The mass hourly space velocity of 14 h^-1 was reasonable value.