采用正硅酸乙酯（TEOS）作硅源，十六烷基三甲基溴化铵（CTAB）为模板剂，在高压（约7 MPa）和373 K下合成了MCM-48介孔分子筛.用XRD、氮气吸附及^(29)Si MAS NMR对样品进行了表征.与常压合成的相比，高压下合成的MCM-48具有更高的热稳...采用正硅酸乙酯（TEOS）作硅源，十六烷基三甲基溴化铵（CTAB）为模板剂，在高压（约7 MPa）和373 K下合成了MCM-48介孔分子筛.用XRD、氮气吸附及^(29)Si MAS NMR对样品进行了表征.与常压合成的相比，高压下合成的MCM-48具有更高的热稳定性和水热稳定性.^(29)Si MAS NMR结果表明，高压有利于分子筛孔壁的聚合，导致分子筛结构更加完善，从而使其具有更高的稳定性.展开更多
The isopropylation of naphthalene with isopropanol over AlMCM- 48 mesoporous molecular sieves was studied. AlMCM- 48 showed high activity and shape selectivity to the isopropylation of naphthalene. Grafting aluminum o...The isopropylation of naphthalene with isopropanol over AlMCM- 48 mesoporous molecular sieves was studied. AlMCM- 48 showed high activity and shape selectivity to the isopropylation of naphthalene. Grafting aluminum on MCM- 48 improved its acidity. It was found that with the increasing of Al content, the performance of AlMCM- 48 catalysts for naphthalene conversion was enhanced. High naphthalene conversion of 89.5％ was achieved over AlMCM- 48 with Si/Al=5.3 under the reaction conditions:n(isopropanol) /n(naphthalene)=2, temperature T=250℃ , time t=4 h.展开更多
文摘采用正硅酸乙酯（TEOS）作硅源，十六烷基三甲基溴化铵（CTAB）为模板剂，在高压（约7 MPa）和373 K下合成了MCM-48介孔分子筛.用XRD、氮气吸附及^(29)Si MAS NMR对样品进行了表征.与常压合成的相比，高压下合成的MCM-48具有更高的热稳定性和水热稳定性.^(29)Si MAS NMR结果表明，高压有利于分子筛孔壁的聚合，导致分子筛结构更加完善，从而使其具有更高的稳定性.
文摘The isopropylation of naphthalene with isopropanol over AlMCM- 48 mesoporous molecular sieves was studied. AlMCM- 48 showed high activity and shape selectivity to the isopropylation of naphthalene. Grafting aluminum on MCM- 48 improved its acidity. It was found that with the increasing of Al content, the performance of AlMCM- 48 catalysts for naphthalene conversion was enhanced. High naphthalene conversion of 89.5％ was achieved over AlMCM- 48 with Si/Al=5.3 under the reaction conditions:n(isopropanol) /n(naphthalene)=2, temperature T=250℃ , time t=4 h.
