酸处理铌酸催化模拟汽油氧化脱硫的研究

摘要

以二苯并噻吩的异辛烷溶液为模拟油、过氧化氢为氧化剂,在密闭钢制反应釜反应器中,分别考察以水洗铌酸、硝酸处理铌酸、硝酸及磷酸处理铌酸为催化剂时的催化氧化脱硫性能.结果表明,硝酸及磷酸处理铌酸催化剂具有较高的催化活性和再生性能,在催化剂用量为5％、反应温度为60℃、反应时间为3h、氧化剂H2 O2与硫摩尔比为3、剂油体积比为1时,脱硫率可达96.34％.%Using dibenzothiophene containing isooctane as model oil and hydrogen peroxide as oxi-dant,the effect of three niobic acid catalysts (treated by water,nitric acid and nitric acid/phosphoric acid respectively) on the catalytic performance of oxidative desulfurization was investigated by a steel bomb reactor. Test results showed that niobic acid treated by nitric acid and phosphoric acid exhibited the best catalytic activity and stability among the three catalysts. Under the conditions of a catalyst dosage of 5% ,a reaction temperature of 60 t ,a reaction time of 3 h,a H2O2/S molar ratio of 3 and solvent to oil volume ratio of l,the desulfurization rate reached 96. 34%.