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采用 1 H,2 9Si,2 7Al魔角旋转固体核磁共振 ( MAS NMR)及 1 H-2 9Si交叉极化 ( CP)技术研究丝光沸石水蒸气 /酸浸渍脱铝过程中各种铝物质的结构与性质 .结果表明 ,丝光沸石上骨架铝原子在水分子作用下 ,生成非骨架四配位铝物质 [Al( OH) 3( H2 O) ],分别在 2 7Al谱 δ45和 1 H谱 δ3 .0处出现共振信号 ,这种铝物质不同于扭曲四配位铝 ,在高温下进一步水合生成 Al( OH) 3( H2 O) 2 和 Al( OH) 3( H2 O) 3,即非骨架五配位和六配位铝物质 .1 H-2 9Si CP和1 H谱证实 ,水蒸气脱铝使丝光沸石产生了大量的硅羟基和铝羟基 .
The structures of various aluminum species during the dealumination of mordenite with steam and acid were studied by 1 H, 29Si, 27Al magic angle rotation solid state nuclear magnetic resonance (MAS NMR) and 1 H-2 9Si cross-polarization (CP) (Al (OH) 3 (H 2 O)], respectively, in the 2 7 Al spectrum, δ 45 and 1 H spectrum δ 3, respectively. 0 at the resonance signal, the aluminum material is different from the twisted four-coordinated aluminum, further hydration at high temperature to generate Al (OH) 3 (H 2 O) 2 and Al (OH) 3 Coordination and hexacoordination of aluminum species.1 H-2 9Si CP and 1 H-spectra confirmed that the water vapor dealumination produced a large amount of silanol and aluminum hydroxyl groups in mordenite.