V_2O_5催化氧化深度脱硫

Deep desulfurization by catalytic oxidation over V_2O_5 catalyst

为了研究氧化法深度脱硫技术,以H2O2为氧化剂,考察了不同催化剂和助剂对脱硫效果的影响。各催化剂的催化性能大小顺序为V2O5>磷钨酸>磷钼酸。以V2O5为催化剂,无水乙醇为助剂,优化了氧化条件。结果表明:在噻吩/石油醚模拟油体积10 mL、H2O2 0.05 mL(体积分数1.5%)、V2O5 0.002 0 g(质量浓度200 mg/L)、无水乙醇0.50 mL(体积分数5%)、氧化温度40℃的反应条件下,氧化60 min,得到的氧化产物采用N,N-二甲基甲酰胺进行萃取,萃取温度15℃,萃取时间15 min,剂油体积比为1时,噻吩/石油醚模拟油中的噻吩质量浓度由200 mg/L降至30.8 mg/L,脱硫率为84.6%,比未经氧化直接萃取时的脱硫率高28.0%,氧化效果明显。用此方法处理直馏汽油,汽油中硫的质量浓度由179.3 mg/L降至18.0 mg/L,脱硫率为91.0%,具有一定的应用潜力。

To study an oxidative deep desulfurization method,the effects of the catalysts and coagents on desulfurization were investigated with H2O2 as oxidant.The catalytic ability of various catalysts follows the order of V2O5phosphotungstic acidphosphomolybdic acid.The optimum conditions of oxidation were studied with V2O5 as catalyst and anhydrous ethyl alcohol as coagent.The results show that under the conditions of thiophene/petroleum ether model oil volume of 10 mL,H2O2 volume of 0.05 mL（volume fraction 1.5%）,V2O5 catalyst mass of 0.002 0 g（mass concentration 200 mg/L）,anhydrous ethylalcohol of 0.50 mL（volume fraction 5%）,at 40 ℃,reacting for 60 min,the reactants were extracted with N,N-dimethylformamide as the extractant;when extraction temperature is 15 ℃,extraction time is 15 min,and the volume ratio of solvent to oil is 1,the sulfur mass fraction of the thiophene to petroleum ether model oil is reduced from 200 mg/L to 30.8 mg/L,and the desulfurization ratio reaches 84.6%,which is 28.0% higher than that of thiophene/petroleum ether model oil extracted directly without oxidizing.The oxidized desulfurization effect is remarkable.The sulfur mass fraction of gasoline is reduced from 179.3 mg/L to 18.0 mg/L,and the desulfurization rate reaches 91.0% by this method,showing a high potential for industrial application.