Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 16, Issue 1, Pages 57-62Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2010.01.021
Keywords
n-butane; Propylene; Selectivity; Cracking; Si/Al ratio; Dehydrogenation; Total olefins
Funding
- Higher Education Commission, Islamabad, Pakistan
- Beijing Key Laboratory for Green Chemical Reaction Engineering and Technology, Tsinghua University, Beijing, China
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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.
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