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Author Yang, Rumin ♦ Meng, Fanhui ♦ Wang, Xiao ♦ Wang, Yaquan
Source SpringerLink
Content type Text
Publisher SP Higher Education Press
File Format PDF
Copyright Year ©2011
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences
Subject Keyword silicalite-1 ♦ cyclohexanone oxime ♦ vapor phase Beckmann rearrangement ♦ ɛ-caprolactam ♦ Industrial Chemistry/Chemical Engineering ♦ Nanotechnology
Abstract Silicalite-1 was hydrothermally synthesized in the presence of different concentrations of Na$^{+}$ using tetrapropylammonium hydroxide (TPAOH) as a template. The synthesis was followed by a base treatment. The silicalite-1samples were characterized using X-ray diffraction, scanning electron microscopy, N$_{2}$ adsorption, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and NH$_{3}$ temperature-programmed desorption. The samples were used as catalysts for the vapor phase Beckmann rearrangement of cyclohexanone oxime. During the synthesis, the sodium ions were incorporated onto the silicalite-1 crystals, but were then removed by the base treatment. All the catalysts exhibited nearly complete conversion of cyclohexanone oxime to ɛ-caprolactam with selectivities grater than 95%. Addition of less than 2.5 mol-% Na$^{+}$ (relative to TPAOH) did not influence the catalytic properties. However, for Na$^{+}$ concentrations ⩽5 mol-%, the particle sizes of silicalite-1 increased and the catalytic activities decreased, which can be attributed to carbon deposition. The results in this work are of great importance for the polymer industry.
ISSN 20950179
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2011-11-12
Publisher Institution Chinese Universities
Publisher Place Heidelberg
e-ISSN 16737474
Journal Frontiers of Chemical Engineering in China
Volume Number 5
Issue Number 4
Page Count 8
Starting Page 401
Ending Page 408

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Source: SpringerLink