摘要
采用在线脉冲反应色谱和质谱瞬变响应技术 ,对噻吩在USY沸石上的裂化脱硫反应行为进行了研究。结果表明 ,噻吩在USY沸石上发生反应 ,除生成烃和H2 S外 ,还可以生烷基噻吩和苯并噻吩等硫化物 ;但噻吩的裂化脱硫是主要反应。噻吩在USY沸石上裂化脱硫反应中 ,裂化和氢转移是两个重要的反应步骤。热力学上高温有利于前者而低温有利于后者 ,这对矛盾使得 4 0 0℃左右最有利于噻吩的裂化脱硫。本文在实验结果的基础上 ,提出了噻吩在USY沸石上的裂化脱硫及生成其它硫化物的反应机理。
Online pulse reaction chromatography and MS transient response technique were used to investigate the cracking de sulfurization of thiophene over a USY zeolite The products of thiophene cracking contain hydrocarbons (propylene, butane, and butene, etc ) and sulfides (H 2S,2 methyl thiophene, 3 methyl thiophene, di methyl thiophene, tri methyl thiophene and benzothiophene) During the reaction, cracking and hydrogen transfer are two important elementary steps Thermodynamically, the former favors higher temperature while the latter does lower The contradiction leads to about 400?℃ to be the optimal temperature for thiophene conversion Based on the experimental results, the desulfurization mechanism of thiophene over the USY zeolite is proposed
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2001年第6期481-485,共5页
Journal of Fuel Chemistry and Technology
基金
石油科技中青年创新基金 ( 2 0 0 0 42 6)~~
