先后采用氨丙基三乙氧基硅烷、甲醛甲酸溶液和溴乙烷对大孔硅胶进行硅烷化、叔胺化和季铵化,制得改性硅胶,并考察了其对环氧乙烷水合制乙二醇的催化性能和催化剂的膨胀情况.结果表明,在n(EO) /n(H2 O) =1/2 2 ,95℃和1 0MPa的条件下,环氧乙烷转化率为95 8% ,乙二醇选择性为97 5 % .反应2 16h后,催化剂几乎没有发生膨胀 The modified silica gel was prepared by using aminopropyl triethoxysilane, formaldehyde formic acid solution and bromoethane for silylation, tertiary amidation and quaternization of macroporous silica gel. And the expansion of the catalyst.The results showed that the conversion of ethylene oxide was 95% at n (EO) / n (H2 O) = 1/2, 95 and 10 MPa 8%, ethylene glycol selectivity of 97 5% .216h after the reaction, the catalyst almost did not swell