Secondary amine based ionic liquid and defective Keggin type heteropoly acid (HPA) are separately used for efficient one-pot four-component synthesis of 1,2,4,5-tetrasubstituted imidazoles assisted by microwave (MW). ...Secondary amine based ionic liquid and defective Keggin type heteropoly acid (HPA) are separately used for efficient one-pot four-component synthesis of 1,2,4,5-tetrasubstituted imidazoles assisted by microwave (MW). Eco-friendly solvent free procedure, short reaction time, high yield of products and reusability of catalysts are important features of the synthesis. A comparative study on the efficiency of the two catalysts is reported. This work further demonstrates the alternate use of urea, instead of often used ammonium acetate, as source of nitrogen.展开更多
以二苯并噻吩(DBT)溶于正辛烷配制成FCC模拟汽油(硫质量分数为800μg/g),以杂多酸季铵盐[C16H33N-(CH3)3]3PMo12O40为催化剂,H2O2为氧化剂,离子液体[BMIM]BF4为萃取溶剂,考察了催化氧化时间、H2O2用量、催化剂用量及反应温度对FCC模拟...以二苯并噻吩(DBT)溶于正辛烷配制成FCC模拟汽油(硫质量分数为800μg/g),以杂多酸季铵盐[C16H33N-(CH3)3]3PMo12O40为催化剂,H2O2为氧化剂,离子液体[BMIM]BF4为萃取溶剂,考察了催化氧化时间、H2O2用量、催化剂用量及反应温度对FCC模拟汽油氧化萃取耦合脱硫的影响,并探讨了氧化萃取耦合脱硫的反应机理。结果表明:当催化氧化时间t=120 min,反应温度T=60℃,n(催化剂)/n(S)=0.05,n(H2O2)/n(S)=4,萃取剂[BMIM]BF4体积V=1 m L时,FCC模拟汽油脱硫率可达95.1%。[C16H33N(CH3)3]3PMo12O40/H2O2/[BMIM]BF4体系具有较好的循环使用能力,循环使用5次后脱硫率没有明显下降。展开更多
文摘Secondary amine based ionic liquid and defective Keggin type heteropoly acid (HPA) are separately used for efficient one-pot four-component synthesis of 1,2,4,5-tetrasubstituted imidazoles assisted by microwave (MW). Eco-friendly solvent free procedure, short reaction time, high yield of products and reusability of catalysts are important features of the synthesis. A comparative study on the efficiency of the two catalysts is reported. This work further demonstrates the alternate use of urea, instead of often used ammonium acetate, as source of nitrogen.
文摘以二苯并噻吩(DBT)溶于正辛烷配制成FCC模拟汽油(硫质量分数为800μg/g),以杂多酸季铵盐[C16H33N-(CH3)3]3PMo12O40为催化剂,H2O2为氧化剂,离子液体[BMIM]BF4为萃取溶剂,考察了催化氧化时间、H2O2用量、催化剂用量及反应温度对FCC模拟汽油氧化萃取耦合脱硫的影响,并探讨了氧化萃取耦合脱硫的反应机理。结果表明:当催化氧化时间t=120 min,反应温度T=60℃,n(催化剂)/n(S)=0.05,n(H2O2)/n(S)=4,萃取剂[BMIM]BF4体积V=1 m L时,FCC模拟汽油脱硫率可达95.1%。[C16H33N(CH3)3]3PMo12O40/H2O2/[BMIM]BF4体系具有较好的循环使用能力,循环使用5次后脱硫率没有明显下降。
