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化学学报
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化学学报 ›› 1994, Vol. 52 ›› Issue (7): 716-721. 上一篇    下一篇

研究论文

固体高辨核磁共振技术对改性金属离子在HZSM-5分子筛中的行为研究

陈;戴林森;薛志元   

  1. 复旦大学化学系;复旦大学分析测试中心
  • 发布日期:1994-07-15

A high-resolution solid-state nuclear magnetic resonance study of the behaviour of modifying metallic ions in HZSM-5

CHEN;DAI LINSEN;XUE ZHIYUAN   

  • Published:1994-07-15

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使用固体高分辨核样共振技术研究Zn^2+, Ga^3+,等离子在HZSM-5分子筛中的行为。结果表明, Ga^3+离子主要定位于HZSM-5外表面, 不能抑制骨架脱铝; Zn^2+离子进入了HZSM-5内孔道, 取代了桥羟基上部分质子位, 能稳定沸石骨架。Ga^3+,Zn^2+离子均未进入沸石骨架位。骨架脱铝顺序为: GaHZSM-5>ZnHZSM-5》BaHZSM-5≌CaHZSM-5。

关键词: 锌, 化学改性, 吸附, 核磁共振谱法, 热稳定性, 镓, 硅同位素, 氙同位素, 催化活性, 铝同位素

The behavior of modifying metallic ions Zn2+, Ga3+ etc. in HZSM-5 is studied with high-resoln. solid-state NMR using 129Xe, 29Si, 27Al as probes. Experimental results indicate that ion Ga3+ is located mainly on the exterior of HZSM-5 and cannot stabilize the framework, but ion Zn2+ exists inside the channel, replaces the proton's position and stabilizes the framework. Both ions Zn2+ and Ga3+ do not enter into the zeolites framework. The framework dealumination is in accordance with the following order: GaHZSM-5 > HZSM-5 > ZnHZSM-5 ?BaHZSM-5 x CaHZSM-5.

Key words: ZINC, CHEMICAL MODIFICATION, ADSORPTION, NMR SPECTROMETRY, THERMAL STABILITY, GALLIUM, SILICONE ISOTOPES, XENON ISOTOPE, CATALYTIC ACTIVITY, ALUMINIUM ISOTOPES

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