Catalytic dehydrogenation and cracking of industrial dipentene over M/SBA-15 (M=A1, Zn) catalysts

被引：66
作者：
Du, JM [1 ]
Xu, HL [1 ]
Shen, J [1 ]
Huang, JJ [1 ]
Shen, W [1 ]
Zhao, DY [1 ]
机构：
[1] Fudan Univ, Dept Chem, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China
来源：
APPLIED CATALYSIS A-GENERAL | 2005年 / 296卷 / 02期
关键词：
dipentene; p-cymene; toluene; M/SBA-15; (M=A1; Zn); catalytic cracking; dehydrogenation;
D O I：
10.1016/j.apcata.2005.08.030
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：
Al- and Zn-containing mesoporous molecular sieves (SBA-15) were prepared by an impregnation method and were used as catalysts for the catalytic dehydrogenation and cracking of industrial dipentene, an important natural feedstock. The catalysts were characterized by X-Ray fluorescence spectroscopy (XRF), X-Ray diffraction (XRD), N-2 adsorption/desorption, transmission electron microscopy (TEM), magic angle spinning nuclear magnetic resonance (Al-27 MAS NMR) and Fourier transform infrared spectroscopy (FT-IR) techniques. The characterization results suggest that the active components were introduced without changing the mesostructure of SBA-15. FT-IR revealed that AUSBA-15 shows weak Bronsted acidity and strong Lewis acidity, while Zn/SBA-15 only possesses moderate Lewis acidity. Dehydrogenation and cracking products, such as toluene, were found in the dipentene conversion over AUSBA-15, while for Zn/SBA-15, p-cymene was the major dehydrogenation product. Along with the strong Bronsted acidity and high cracking activity of HZSM-5, our results suggest that the reaction pathway is determined by the acidic sites. Stability tests showed the deactivation is also related to the acidity. The highest yield of p-cymene reaches to 86.7% on Zn/SBA- 15 at 723 K. (c) 2005 Elsevier B.V. All rights reserved.
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页码：186 / 193
页数：8
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