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Dehydrogenation of long chain paraffins over supported Pt-Sn-K/Al2O3 catalysts: A study of the alumina support effect

Paper ID Volume ID Publish Year Pages File Format Full-Text
42652 45935 2009 11 PDF Available
Title
Dehydrogenation of long chain paraffins over supported Pt-Sn-K/Al2O3 catalysts: A study of the alumina support effect
Abstract

The support effect on the Pt-Sn-K/Al2O3 catalysts for the long chain paraffins dehydrogenation to mono-olefins has been investigated by the test dehydrogenation reaction of n-octadecane. The catalysts were characterized by using different techniques: BET, MIP, XRD, TEM, SEM, CO-chemisorption, H2-TPR, H2-TPD, NH3-TPD and TG-DTA. Results show that the pore structure and the surface characteristic of the alumina supports strongly affect the catalytic performance. The support effect can be divided into three parts: (I) the BET and pore size distribution govern the Pt dispersion of the catalysts, resulting in influencing the dehydrogenation activity; (II) the inherent acidity controls the acidity of the catalysts, bringing on the different product selectivity; (III) the pore volume provides the effective capability for carbon deposition, thus changing the lifetime of the catalysts. These functions should be adjusted for the alumina supports to achieve an optimal catalytic performance. The ideal catalysts were selected to test the lifetime of the catalysts on the dehydrogenation of n-C16–C19. High activity (the average conversion is 11.6%) and perfect selectivity (the average selectivity is 92%) were exhibited during the reaction time of 960 h.

Graphical abstractThe alumina support effect can be divided into three parts: (I) the BET and PSD govern the Pt dispersion of the catalysts; (II) the inherent acidity controls the acidity of the catalysts; (III) the pore volume provides the effective capability for carbon deposition. These functions should be adjusted to achieve an optimal catalytic dehydrogenation performance.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Dehydrogenation; Long chain paraffins; Alumina support effect; Pore size distribution; Pt-Sn catalysts
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Dehydrogenation of long chain paraffins over supported Pt-Sn-K/Al2O3 catalysts: A study of the alumina support effect
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 356, Issue 1, 1 March 2009, Pages 88–98
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us