Pandey, J.K. (2015) Bismuth Supported SBA-15 catalyst for vapour phase Beckmann rearrangement reaction of cyclohexanone oxime to �-caprolactam. Applied Catalysis A: General , 497. pp. 51-57. ISSN 0926-860X

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Development of environmental benign as well as low cost metal precursor based catalyst is a challenge for chemical industry. In this work we report Bi promoted SBA-15 catalyst for vapour phase Beckmann rearrangement reaction of cyclohexanone oxime. The three different Bi loaded SBA-15 catalysts are pre-pared and characterized by BET surface area and porosity measurement, small angle X-ray scattering, wide angle X-ray diffraction, field emission scanning electron microscope, high resolution transmis-sion electron microscope, ultraviolet–visible spectroscope, Fourier transform infrared spectroscopy and temperature programmed desorption techniques. Further, catalytic activity is optimized by changingreaction temperature, pre-treatment temperature and pre-treatment time so that 100% cyclohexanoneoxime conversion and 100% caprolactam selectivity has been achieved. Role of solvent, silylation and time on stream has also been examined. The TPD profiles of all three bismuth loaded samples are mainly characterized by weak acidic sites or surface silanol groups. The FTIR profile shows hydroxyl rich surface in the vicinity of bismuth at Bi-SBA-15 (Bi/Si = 1/100). Based on catalyst characterization and activity data correlation, it can be suggested that protonation at oxime oxygen can be triggered by surface silanol in the vicinity of a Lewis acid centre bismuth. The high space-time-yield of caprolactum was 114.3 mol gcat−1h−1was obtained.

Item Type: Article
Subjects: Respiratory Protection Laboratory
Depositing User: Mr. B. R. Panduranga
Date Deposited: 01 May 2017 04:05
Last Modified: 01 May 2017 04:05

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