Acid Properties and Catalysis of MCM-22 with Different Al Concentrations
Acid Properties and Catalysis of MCM-22 with Different Al Concentrations
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DOI：
10.1006/jcat.2001.3463
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发表时间：
2002-02
影响因子：
7.3
通讯作者：
K. Okumura;M. Hashimoto;Takayuki Mimura;M. Niwa
中科院分区：
文献类型：
--
作者：
K. Okumura;M. Hashimoto;Takayuki Mimura;M. Niwa
Abstract MCM-22 with Si/Al 2 ratios of 15–80 were hydrothermally synthesized. The acid properties and catalysis of the prepared MCM-22 were studied. The acid character changed depending on the Al concentration. Bronsted acid sites were dominant in the Si/Al 2 ratios of 42–80. These samples showed broad desorption peaks of NH 3 in the temperature-programmed desorption spectra. On the other hand, in the Si/Al 2 with ratios of 15–28, weak Lewis acid sites were dominant. The ratio of total acid against contained Al was calculated to be 32–51%. The value was characteristically lower than the stoichiometry, which suggested that only a part of Al was incorporated in the MCM-22 framework. The cracking of octane isomer and liquid-phase Friedel–Crafts acylation were carried out over MCM-22 with different amounts of Al. The catalytic performance was correlated with the structure and acid properties of MCM-22.
