TS-1/SiO_2 extrudate was post-treated with mixed solution of tetrapropyl ammonium hydroxide(TPAOH)and various ammonium salts solution(NH_4F,(NH_4)_3PO_4,(NH_4)_2CO_3,(NH_4)_2SO_4,NH_4CH_3CO_2,NH_4NO_3,NH_4Cl and(NH_4)...TS-1/SiO_2 extrudate was post-treated with mixed solution of tetrapropyl ammonium hydroxide(TPAOH)and various ammonium salts solution(NH_4F,(NH_4)_3PO_4,(NH_4)_2CO_3,(NH_4)_2SO_4,NH_4CH_3CO_2,NH_4NO_3,NH_4Cl and(NH_4)_2TiF_6).The obtained hierarchical TS-1 catalysts were characterized by many techniques and tested for propylene epoxidation using hydrogen peroxide as an oxidant in a fixed-bed reactor.It was shown that the physicochemical and catalytic properties of the treated TS-1/SiO_2 extrudate depended on the types of ammonium salts added.Compared to the treatment with TPAOH alone,the treatment with a mixed solution of TPAOH and some ammonium salts can greatly improve the catalytic properties of the treated TS-1/SiO_2 extrudate.Some of these ammonium salts were favorable for the incorporation of titanium in the framework,and the beneficial effect depended on the types of ammonium salt.TS-1/SiO_2 extrudate treated with a mixed solution of TPAOH and(NH_4)_3PO_4 exhibited the highest catalyst stability in propylene epoxidation.Such catalytic property can be correlated to high crystallinity,more framework titanium,large specific surface area and large external surface area.展开更多
应用苄基三乙基氯化胺作相转移催化剂,在氢氧化钠水溶液和醇中反应,分离出一种反应中间体离子对Q^+-OR(Q^+=(?)—CH_2(?)(C_2H_5)_3,R=CH_3,C_2H_5)。用实验方法证实了硝基氟苯和醇,氢氧化钠通过季铵盐相转移催化剂合成硝基苯烷醚,该反...应用苄基三乙基氯化胺作相转移催化剂,在氢氧化钠水溶液和醇中反应,分离出一种反应中间体离子对Q^+-OR(Q^+=(?)—CH_2(?)(C_2H_5)_3,R=CH_3,C_2H_5)。用实验方法证实了硝基氟苯和醇,氢氧化钠通过季铵盐相转移催化剂合成硝基苯烷醚,该反应是按照C. M. Starks提出的相转移催化机理进行的。展开更多
基金supported by National Natural Science Foundation of China (No. 21276183)
文摘TS-1/SiO_2 extrudate was post-treated with mixed solution of tetrapropyl ammonium hydroxide(TPAOH)and various ammonium salts solution(NH_4F,(NH_4)_3PO_4,(NH_4)_2CO_3,(NH_4)_2SO_4,NH_4CH_3CO_2,NH_4NO_3,NH_4Cl and(NH_4)_2TiF_6).The obtained hierarchical TS-1 catalysts were characterized by many techniques and tested for propylene epoxidation using hydrogen peroxide as an oxidant in a fixed-bed reactor.It was shown that the physicochemical and catalytic properties of the treated TS-1/SiO_2 extrudate depended on the types of ammonium salts added.Compared to the treatment with TPAOH alone,the treatment with a mixed solution of TPAOH and some ammonium salts can greatly improve the catalytic properties of the treated TS-1/SiO_2 extrudate.Some of these ammonium salts were favorable for the incorporation of titanium in the framework,and the beneficial effect depended on the types of ammonium salt.TS-1/SiO_2 extrudate treated with a mixed solution of TPAOH and(NH_4)_3PO_4 exhibited the highest catalyst stability in propylene epoxidation.Such catalytic property can be correlated to high crystallinity,more framework titanium,large specific surface area and large external surface area.
文摘应用苄基三乙基氯化胺作相转移催化剂,在氢氧化钠水溶液和醇中反应,分离出一种反应中间体离子对Q^+-OR(Q^+=(?)—CH_2(?)(C_2H_5)_3,R=CH_3,C_2H_5)。用实验方法证实了硝基氟苯和醇,氢氧化钠通过季铵盐相转移催化剂合成硝基苯烷醚,该反应是按照C. M. Starks提出的相转移催化机理进行的。
