正丁烯骨架异构催化剂再生性能

采用小型固定床装置评价自制ZSM-35分子筛催化剂正丁烯骨架异构性能,在反应温度380℃、反应压力0.1 MPa和空速6.0 h-1条件下反应350 h,正丁烯转化率和异丁烯收率均大于35%,异丁烯选择性大于95%,副产物收率在反应进行至120 h时接近0,催化剂正丁烯骨架异构性能稳定。通过程序升温氧化表征研究催化剂积炭过程,采用程序升温氧化烧碳法对催化剂进行再生,采用XRD、NH3-TPD和BET等表征新鲜催化剂和三次再生催化剂的物化性能,结果表明,再生催化剂的物化性质几乎无变化,三次再生催化剂异构性能接近新鲜催化剂,催化剂再生性能良好。

Regeneration performance of the catalyst for n-butene skeletal isomerization

The performance of self-made ZSM-35 molecular sieve catalyst for n-butene skeletal isomerization was evaluated in a small fixed bed reactor.Under the condition of reaction time 350 h,reaction temperature 380 ℃,reaction pressure 0.1 MPa and space velocity 6.0 h^-1,both n-butene conversion and i-butene yield maintained above 35%,and the selectivity to i-butene reached above 95%.The byproduct yield was close to 0 for reaction time 120 h.The catalyst for n-butene skeletal isomerization exhibited good stability.The carbon deposition process of the catalyst was investigated by TPO technique,and the used catalyst was regenerated by temperature programmed oxidation.The physicochemical properties of the fresh catalyst and the catalyst regenerated for three times were characterized by XRD,NH₃-TPD and BET.The results indicated that the physicochemical properties and skeletal isomerization performance of the regenerated catalysts approached those of the fresh catalyst,and the self-made catalyst exhibited good regenerability.