活性炭负载磷钨酸催化剂的制备及其催化氧化脱硫性能
发布时间：2018-10-11 11:28
【摘要】：以活性炭(AC)为载体,磷钨酸(HPW)为活性组分,通过等体积浸渍法制备HPW/AC催化剂,并以二苯并噻吩(DBT)的正十二烷溶液为模拟油(硫含量为800μg/g),H_2O_2为氧化剂,探究催化剂的催化氧化脱硫性能。采用BET、SEM和XRD表征手段对催化剂的结构进行分析。考察了反应温度、反应时间、H_2O_2用量、催化剂用量、乳化剂用量以及模拟油的组成对催化剂催化氧化脱硫效果的影响,最后考察了催化剂的循环使用性能。结果表明,AC经质量分数45%硝酸溶液80℃下活化2h,活性组分HPW的负载质量分数为30%时,所制备的HPW/AC催化剂的氧化脱硫性能最好;最佳反应条件为反应温度80℃,反应时间80min,氧化剂/硫摩尔比n(H_2O_2)/n(S)=12,催化剂用量0.05g/m L,乳化剂用量0.004g/m L。该反应条件下DBT被氧化为二苯并噻吩砜(DBTO_2),用N-甲基吡咯烷酮(NMP)进行萃取,萃取比为1,模拟油的氧化脱硫率达到90.4%。芳香族化合物和烯烃对氧化脱硫效果起到抑制作用,烯烃的影响最为显著,并且催化剂具有良好的稳定性。
[Abstract]:Using active carbon (AC) as carrier and phosphotungstic acid (HPW) as active component, the HPW/AC catalyst was prepared by iso-volume impregnation method. The n-dodecane solution of dibenzothiophene (DBT) was used as simulated oil (sulfur 800 渭 g / g) and H_2O_2 as oxidant. To explore the catalytic oxidation desulfurization performance of the catalyst. The structure of the catalyst was characterized by BET,SEM and XRD. The effects of reaction temperature, reaction time, amount of H_2O_2, amount of catalyst, amount of emulsifier and composition of simulated oil on catalytic oxidation desulfurization of the catalyst were investigated. The results show that when AC is activated at 80 鈩，
本文编号：2264023
[Abstract]:Using active carbon (AC) as carrier and phosphotungstic acid (HPW) as active component, the HPW/AC catalyst was prepared by iso-volume impregnation method. The n-dodecane solution of dibenzothiophene (DBT) was used as simulated oil (sulfur 800 渭 g / g) and H_2O_2 as oxidant. To explore the catalytic oxidation desulfurization performance of the catalyst. The structure of the catalyst was characterized by BET,SEM and XRD. The effects of reaction temperature, reaction time, amount of H_2O_2, amount of catalyst, amount of emulsifier and composition of simulated oil on catalytic oxidation desulfurization of the catalyst were investigated. The results show that when AC is activated at 80 鈩，
本文编号：2264023
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