Nb/USY的制备及催化氧化脱硫性能

Preparation and Catalytic Oxidation Desulfurization Performance of Nb/USY

摘要:

以USY分子筛为载体，铌酸为铌源，通过浸渍法制备了Nb/USY催化剂,并采用XRD、FT-IR 、TG-DTA等手段对其进行表征分析。以噻吩的异辛烷溶液为模拟汽油、H2O2为氧化剂进行氧化脱硫反应,考察了铌酸负载量、催化剂焙烧温度、焙烧时间对催化剂活性的影响以及催化剂的再生使用性能，通过对氧化产物的分析，探讨了氧化脱硫机理。结果表明，在铌酸的负载量为15%、催化剂焙烧温度为300℃、焙烧时间为120min时，Nb/USY催化剂活性最高，且再生性能良好，经分析确定噻吩硫的最终的氧化产物为硫酸根。

Abstract:

The supported Nb/USY catalyst with molecular sieve USY as support and niobium acid as Nb source was synthesized by the method of impregnation. The samples were characterized by means of XRD, FT-IR TG-DTA. Using H2O2 as oxidant and Thiophene of isooctane solution as the simulated oil to do experiment. The effects of Nb-Ioading, caIcination temperature and time on the cataIyst activity and the performance of the catalyst regeneration were studied. Through analyzing of the oxidation product, explore the mechanism of oxidative desulfurization. The experimental results indicated that,when the amount of niobic acid loading is 15%, caIcination temperature is 300℃, time is 120min, Nb/USY exhibited the highest activity,in addtion, its regeneration properties were good, the final oxidation product of Thiophene is sulfate.