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篇目详细内容 |
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【篇名】 |
Influence of Na+ on the synthesis of silicalite-1 catalysts for use in the vapor phase Beckmann rearrangement of cyclohexanone oxime |
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【刊名】 |
Frontiers of Chemical Science and Engineering |
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【刊名缩写】 |
Front. Chem. Sci. Eng |
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【ISSN】 |
2095-0179 |
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【EISSN】 |
2095-0187 |
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【DOI】 |
10.1007/s11705-011-1129-5 |
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【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
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【出版年】 |
2011 |
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【卷期】 |
5
卷4期 |
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【页码】 |
401-408
页,共
8
页 |
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【作者】 |
Rumin YANG;
Fanhui MENG;
Xiao WANG;
Yaquan WANG;
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【关键词】 |
silicalite-1; cyclohexanone oxime; vapor phase Beckmann rearrangement; ε-caprolactam |
【摘要】 |
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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, N2 adsorption, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and NH3 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 ε-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. |
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