期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 47, 页码 26611-26619出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b09289
关键词
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资金
- U.S. Department of Energy, Office of Science, Division of Basic Energy Sciences [DE-FG-02-03ER15467, DE-AC02-76SF00515]
- CNRS
- French Ministry of Research and Higher Education
- TGIR RMN THC [Fr3050]
The reaction of triisobutylgallium toward meso-H-ZSM-5(250), prepared by desilication of H-ZSM-5, has been studied by IR, high field solid-state NMR, and EXAFS spectroscopies as well as elemental analysis. Grafting occurs selectively on silanol groups, resulting in the monopodal gallium species [( SiO)Ga(i-Bu)(2)]. Since the Bronsted acidic protons remain largely unreacted, control of the surface organometallic chemistry affords a zeolitic material with both gallium sites and significant Bronsted acidity. The resulting bifunctional Ga(i-Bu)(3)/meso-H-ZSM-5(250) shows higher activity and selectivity in propane aromatization than monofunctional meso-H-ZSM-5(250). The aromatic products arise from alkane dehydrogenation on the gallium sites, followed by oligomerization, cyclization, and aromatization of the resulting olefins on the Bronsted acid sites.
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