水热法制备WO_3微米棒及其催化脱除二苯并噻吩研究

HYDROTHERMAL SYNTHESIS OF WO_3 MICRORODS AND ITS CATALYTIC PERFORMANCE OF REMOVING DIBENZOTHIOPHENE

以钨酸钠和硝酸铵为原料采用水热法制备WO3微米棒。以WO3微米棒为催化剂,H2O2为氧化剂,对模拟油中的二苯并噻吩(DBT)进行催化氧化脱硫研究,考察不同的反应条件对DBT脱除效果的影响,确定适宜的反应条件。结果表明:H2O2?WO3?十六烷基三甲基溴化铵体系对DBT具有较高的脱除率;对于5mLDBT质量分数为500gμ?g的模拟油,适宜的反应条件为:催化剂WO3微米棒的用量0.01g、n(H2O2)?n(DBT)=8、反应温度70℃、反应时间1.5h、萃取剂N,N-二甲基甲酰胺加入量8mL、萃取时间5min,在该条件下DBT的脱除率为100%;催化剂循环使用5次后,DBT的脱除率没有明显下降。

WOa microrods were prepared under hydrothermal conditions using sodium tungstate and ammonium nitrate as raw materials. Oxidative desulfurization reactions of model oil containing dibenzo- thiophene （DBT） were studied over WOa nanorods catalyst and using H202 as oxidant. The effect of ex- perimental conditions on desulfurization rate was investigated and the optimum reaction conditions were determined. Test results show that H202/WOa/CTAB system is effective to remove DBT. Using 5 mL of model oil with DBT mass fraction of 500 μg/g, under the conditions of WO3 microrods amount of 0.01 g, H202/DBT molar ratio of 8, a reaction temperature of 70 ℃, a reaction time of 1.5 h, using N,N-dim- ethylformamide as extractant with an amount of 8 mE and an extraction time of 5 min, the removal rate of DBT reaches 100%. The catalyst is recycled five times and without significant decrease in DBT removal rate.