以磷钨酸/半焦为催化剂对模拟油氧化脱硫的研究

以双氧水为氧化剂、磷钨酸/半焦(HPW/Sc)为催化剂、N-甲基吡咯烷酮为萃取剂、Span60为乳化剂，对以苯并噻吩(BT)、二苯并噻吩(DBT)、 4,6-二甲基二苯并噻吩(4,6-DMDBT)为模型含硫化合物的模拟油进行氧化脱硫研究，考察磷钨酸负载量、氧化温度、氧化反应时间和模拟油中烯烃、芳烃和含氮化合物对含硫化合物脱除的影响。结果表明：催化剂的最佳磷钨酸负载量（w）为30%；在反应时间为60 min、反应温度为60 ℃、HPW/Sc2用量（w）为1.0%、Span60用量（w）为0.36%、n(H2O2)/ n(S)=3的条件下，DBT脱除率可达到99%，含硫化合物的氧化活性由大到小的顺序为DBT?4,6-DMDBT＞BT；模拟油中的苯可促进DBT脱出，而喹啉和环己烯则抑制DBT的脱除。

STUDY ON OXIDATIVE DESULFURIZATION OF SIMULATED OIL USING PHOSPHOTUNGSTIC ACID/SEMI-COKE AS CATALYST

Oxidative desulfurization of benzothiophene（BT，DBT and 4,6-DMDBT） in simulated oil was investigated using hydrogen peroxide as oxidant, Span60 as emulsifier, N-Methyl pyrrolidone as extractant and phosphotungstic acid/semi-coke (HPW/Sc) as catalyst. The catalysts of phosphotungstic acid (HPW)/semi-coke (Sc) were characterized by FTIR. The effect of HPW loading amount, reaction temperature, reaction time, and aromatics, olefins and nitrogen compounds on desulfurization rate was studied. The results show that the sulfur removal efficiency of DBT reaches above 99% using the catalyst with 30% HPW loading at the conditions of temperature of 60 ℃, reaction 60 min, amount of catalyst 1.0%, n(H2O2)/ n(S)=3, amount of Span60 emulsifier 0.36%，and the oxidative activity of the model sulfur compounds follows the order of DBT＞4,6-DMDBT＞BT. The benzene in the test oil can promote DBT desulfurization, while quinoline and cyclohexene inhibit the removal of DBT.