期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 223, 期 -, 页码 46-52出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2015.10.026
关键词
Zirconium; Evaporation-induced self-assembly; Lewis acid; Dehydration; Isopropanol
类别
资金
- U.S. Department of Agriculture-National Institute of Food and Agriculture [2011-10006-30362]
- NSF Major Research Instrumentation grants [CBET-1229645, CHE-0923449]
Zirconium ions were incorporated into mesostructured silicate by evaporation-induced self-assembly (EISA) method without the addition of a mineral acid. Zr loadings up to 26.5 wt% were achieved. The BET surface area and the pore volume of the Zr-EISA samples are in the range of 818-614 m(2)/g and 1.2-1.01 cm(3)/g, respectively. Amorphous ordered pore structure was evident from HR-TEM images. Diffuse reflectance UV-Vis spectra reveal that a majority of the Zr exists as isolated framework species and impart Lewis acidity. Pyridine FTIR analysis revealed the presence of both Lewis and Bronsted acid sites in the Zr-EISA samples. The Zr-EISA materials exhibit excellent isopropanol dehydration activity with nearly total olefin selectivity characterized by a moderate activation energy (approximately 86 +/- 1 kJ/mol). (C) 2015 Elsevier Inc. All rights reserved.
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