Acidity Characterization of HZSM-35 Zeolite by Solid-State NMR

被引：0

作者：

Liu Yong ^{[1
,2
]}

Zhang Weiping ^{[1
]}

Xie Sujuan ^{[1
]}

Xu Longya ^{[1
]}

Han Xiuwen ^{[1
]}

Bao Xinhe ^{[1
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

来源：

CHINESE JOURNAL OF CATALYSIS | 2009年 / 30卷 / 02期

关键词：

HZSM-35; zeolite; acidity; solid-state nuclear magnetic resonance; probe molecule; trimethylphosphine; deuterated pyridine; SKELETAL ISOMERIZATION; PROBE MOLECULE; H-FERRIERITE; N-BUTENE; SITES; SPECTROSCOPY; TRIMETHYLPHOSPHINE;

D O I：

暂无

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The accessibility and acidity of HZSM-35 zeolite were studied by high-resolution solid-state MAS NMR spectroscopy after adsorption of deuterated pyridine or trimethylphosphine as probe molecules. The results showed that the probe molecules could enter both the ten-membered ring (10-MR) channels and eight-membered ring (8-MR) cavities. However, the diffusion into the 8-MR cavities was very slow and it took a long time to reach the adsorption equilibrium at 300 degrees C. After adsorption of deuterated pyridine, H-1 MAS NMR spectra showed that there were two types of Bronsted acidic sites with different strength in both the 10-MR channels and 8-MR cavities. After adsorption of trimethylphosphine, the P-31 MAS NMR spectra indicated that there were Lewis acidic sites in HZSM-35 zeolite, but their strength and amount were less than the Bronsted acidic sites.

引用

页码：119 / 123

页数：5

共 21 条

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