期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 7, 期 21, 页码 5055-5068出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cy01661a
关键词
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资金
- National Natural Science Foundation of China [21273265, 21503252]
- Strategic Priority Research Program Demonstration of Key Technologies for Clean and Efficient Utilization of Low-rank Coal [XDA07070700]
- Coal base Key Technologies R & D Program of Shanxi Province [MH2014-13]
- Shanxi Provincial Research Foundation for Basic Research [2014021014-6, 201601D021044]
Highly siliceous ZSM-22 was synthesized under hydrothermal conditions with ZSM-22 seeds. Characterization by FT-IR and H-1 and Si-29 NMR spectroscopy confirms that due to the existence of defective sites in the siliceous ZSM-22, acidic silanol groups including vicinal silanol and silanol nests are detected. Acidic silanol groups are considered as the acid sites of siliceous ZSM-22. As a result, siliceous ZSM-22 shows much lower acid site density and lower acid strength than silica-alumina ZSM-22 which contains hydroxyl groups bridging Si and Al as acid sites. In n-dodecane isomerization, Pt/siliceous ZSM-22 shows much higher isomer selectivity than Pt/silica-alumina ZSM-22. Furthermore, a lower loading amount of Pt on siliceous ZSM-22 (about 0.2 wt% Pt) can lead to high isomer selectivity. Owing to the acidic silanol groups and the low acid site density of siliceous ZSM-22, a good balance between metal and acid function in Pt/siliceous ZSM-22 is achieved, which results in a lower allowable Pt loading value and higher isomer selectivity.
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