Effect of Si/Al ratio on performance of Pt-Sn-based catalyst supported on ZSM-5 zeolite for n-butane conversion to light olefins

被引：41

作者：

Nawaz, Zeeshan ^{[1
]}

Qing, Shu ^{[1
]}

Gao Jixian ^{[1
]}

Tang, Xiaoping ^{[1
]}

Wei, Fei ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Chem Engn, Beijing Key Lab Green Chem React Engn & Technol, FLOTU, Beijing 100084, Peoples R China

来源：

JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY | 2010年 / 16卷 / 01期

关键词：

n-butane; Propylene; Selectivity; Cracking; Si/Al ratio; Dehydrogenation; Total olefins; DEHYDROGENATION; CRACKING; ISOBUTANE; PROPANE;

D O I：

10.1016/j.jiec.2010.01.021

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The performance of Pt-Sn-based catalyst, supported on ZSM-5 of different Si/Al ratios were investigated for simultaneous dehydrogenation and cracking of n-butane to produce light olefins. The catalysts were characterized by number of physio-chemical techniques including XRF, TEM, IR spectra, NH3-TPD and O-2-pulse analysis. Increase in Si/Al ratio of zeolite support ZSM-5 significantly increased light olefin's selectivity, while feed conversion decreases due to lower acidity of support. The results indicated that both the n-butane cracking and dehydrogenation activity to light olefin's over Pt-Sn/ZSM-5 samples with increasing Si/Al ratios greatly enhanced catalytic performance. The catalysts were deactivated with time-on-stream due to the formation of carbon-containing deposits. A coke deposition was significantly related to catalyst activity, while at higher Si/Al ratio catalyst the coke precursors were depressed. These results suggested that the Pt-Sn/ZSM-5 catalyst of Si/Al ratio 300 is superior in achieving high total olefins selectivity (above 90 wt.%). The Pt-Sn/ZSM-5 also demonstrates resistance towards hydrothermal treatment, as analyzed through the three successive reaction-regeneration cycles. (C) 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

引用

页码：57 / 62

页数：6