Catalytic properties of WOx/SBA-15 for vapor-phase Beckmann rearrangement of cyclohexanone oxime

被引：35
作者：
Bordoloi, Ankur [1 ]
Halligudi, S. B. [2 ]
机构：
[1] Univ Ottawa, Dept Chem, Ctr Catalysis Res & Innovat, Ottawa, ON K1N 6N5, Canada
[2] C MET, Nanosci Lab, CSIR, Pune 411008, Maharashtra, India
来源：
APPLIED CATALYSIS A-GENERAL | 2010年 / 379卷 / 1-2期
关键词：
Beckmann rearrangement; WOx/SBA-15; Vapor-phase reaction; Cyclohexanone oxime; epsilon-Caprolactam; MOLECULAR-SIEVES; EPSILON-CAPROLACTAM; SILICA; EFFICIENT; SBA-15; STABILITY; ZEOLITES; SURFACE;
D O I：
10.1016/j.apcata.2010.03.017
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
WOx/SBA-15 nanocomposite materials with different WOx loadings were prepared by one step hydrothermal synthesis and used in the vapor-phase Beckmann rearrangement of cyclohexanone oxime to e-caprolactam. The catalysts were thoroughly characterized by X-ray diffraction (XRD), sorption analysis, energy dispersive X-ray analysis (EDAX) and Raman spectroscopy. The acidities of the catalysts were estimated by ammonia temperature programmed desorption (NH3-TPD) and Fourier transform infrared studies of adsorbed pyridine (pyridine-FTIR). The optimum temperature for the Beckmann rearrangement was 350 degrees C. Using WOx/SBA-15(20) under the vapor-phase reaction conditions [temperature =350 degrees C. WHSV = 0.6 h(-1), oxime concentration = 2.5% (w/w) in MeOH] gave 79% cyclohexanone oxime conversion with 93%, E-caprolactam selectivity. The epsilon-caprolactam selectivity was found to be dependent on temperature and space velocity. A correlation has been made between the rearrangement activity and acidity and the structural properties of the catalysts. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：141 / 147
页数：7
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