期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 234, 期 -, 页码 293-302出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2016.07.024
关键词
Indium; SBA-15; In-situ SANS; SAXS; e-Caprolactam
类别
资金
- Laboratory Directed Research and Development Program
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- Indian School of Mines
- CSIR, Govt. of India [01/2759/13/EMR II]
The Indium doped SBA-15 material was prepared by sol-gel method and tested for vapor phase Beckman rearrangement reaction. Among three indium loading, In/Si ratio of 2/100 was found as an optimum composition in terms of caprolactam selectivity (100%) and cyclohexanone oxime conversion (100%). The catalysts were characterized by N-2 adsorption, small-angle X-rays/neutron scattering (SAXS/SANS), XRD, FESEM, HRTEM, EDX, UV, FTIR and NH3-TPD techniques. In-situ SANS experiment was performed on the adsorption of CO2 to detect the micropores in the mesopore wall. All catalysts samples have highly ordered hexagonal structure with well dispersed indium in the silica matrix. The fine tuning of weak and strong acid sites were found in indium doped SBA-15 (In/Si = 2/100) catalyst. The same catalyst showed optimum catalytic performance, high space time yield 114.4 mol/h/g(cat) and high stability till 6 h of reaction without deactivation. The micro-kinetic analysis showed that there were no external and internal diffusion limitations in the SBA-15 catalyst. The reaction mechanism of Beckmann rearrangement over In-SBA-15 has been elucidated. (C) 2016 Elsevier Inc. All rights reserved.
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