氨基功能化HMS负载磷钨酸催化氧化脱硫研究

以硅烷偶联剂(KH-550),采用二次合成的方法对六方介孔二氧化硅HMS分子筛进行氨基表面功能化,并采用浸渍法将磷钨酸(HPW)负载于功能化样品上,即制成负载型磷钨酸催化剂(HPW/NH2/HMS),以过氧化氢为氧化剂,以含苯并噻吩的石油醚作为模拟燃料油,进行催化氧化脱硫的研究。在反应温度为60℃、m(O)∶m(S)=16、m(催化剂)∶m(模拟油)=0.45、反应时间为1.5h条件下,确定了氧化脱硫工艺条件。在最佳工艺条件下,w(硫)由973μg/g降至129μg/g,脱硫率达86.79%。通过对比发现,HPW/NH2/HMS的脱硫效果比HPW的脱硫效果好,负载后催化剂的活性得到大大提高。重复使用7次,脱硫率仍可达83.49%,催化剂重复使用性能较好。

Study on catalytic oxidation desulfurization with amino functional HMS loaded phosphotungstic acid

The study on catalytic oxidation desulfurization done with compounded supported phosphotungstic acid as catalyst （HPW/NH2/HMS） was carried out,using hydrogen peroxide as oxidant,with petroleum ether containing benzthiophene as a mock fuel oil.The catalyst was compounded by using KH-550 as the silane coupling agent,adopting the method of quadratic synthetic amino surface functionalization on HMS molecular sieve,and taking HPW to load on NH2/HMS by immersion method.The optimal oxidation desulfurization process conditions were determined as follows：reaction temperature is 60 ℃,the ratio of the number of oxygen atom to sulfur atom is 16,the ratio of the mass of catalyst to oil is 0.45 ％,reaction time is 1.5 h.Under these conditions,sulfur content by 973 tg/g fell to 129μg/g,desulfurization efficiency reached up to 86.79 ％.By comparison,found that the HPW/NH2/ HMS desulfurization effect is better than the HPW.Besides,the activity of the former are improved greatly.Repeated use 7 times,the desulfurization rate can reach to 83.49 ％,still the catalyst performance of reuse is quite good.