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用气体分析及IR ,NMR和元素分析等方法研究了真空系统中 2 30和 2 80℃下四丁基锗在ZSM 5沸石表面上的接枝反应 ,并对所得沸石的热稳定性和吸附性质进行了表征 .与作者曾报道的在硅胶及丝光沸石上的反应类似 ,四丁基锗也能与ZSM 5沸石表面上的硅羟基发生缩合反应 ,在其外表面或孔口生成组成为 (≡Si—O) xGe(n C4 H9) 4-x(x =13)的表面有机锗化合物 .在 2 30℃接枝丁基锗基团不影响沸石的结构和表面积 ,仅改变它的孔口大小 .在改性后的沸石上 ,N2 的吸附性质没有改变 ,而不同分子尺寸的烃 ,如正己烷、2 甲基戊烷、2 ,3 二甲基丁烷却呈现出完全不同于起始ZSM 5沸石的择形吸附效应 .
The grafting reaction of tetrabutyl germanium at 2 30 and 2 80 ℃ on the surface of ZSM 5 zeolite in vacuum system was studied by gas analysis, IR, NMR and elemental analysis. The thermal stability and adsorption properties . Similar to the reactions reported by the authors on silica and mordenite, tetrabutyl germanium can also undergo condensation reaction with silanol groups on the surface of ZSM 5 zeolites to form (≡ Si-O) xGe (n C4 H9) 4-x (x = 13) The grafting of the butylgermanium group at 230 ℃ did not affect the structure and surface area of the zeolite but changed its pore size On the modified zeolite, the adsorption properties of N2 are not changed, while the different molecular sizes of hydrocarbons such as n-hexane, 2-methylpentane, 2,3 dimethylbutane showed completely different from the initial ZSM 5 zeolite shape-selective adsorption effect.