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Ethene production by oxidative dehydrogenation of ethane at short contact times over Pt-Sn coated monoliths

Paper ID Volume ID Publish Year Pages File Format Full-Text
42204 45915 2010 10 PDF Available
Title
Ethene production by oxidative dehydrogenation of ethane at short contact times over Pt-Sn coated monoliths
Abstract

The oxidative dehydrogenation of ethane to ethene was studied in a monolithic reactor at short contact times using a Pt-Sn/Al2O3 catalyst. The catalyst was characterised by Temperature Programmed Reduction (TPR), Scanning Transmission Electron Microscopy as well as H2 and CO chemisorption. Three different preparation methods were used for the Pt-Sn catalyst; two-step impregnation where Pt was impregnated first, two-step impregnation where Sn was impregnated first and co-impregnation. The results from the oxidative dehydrogenation of ethane show that the two-step impregnated catalyst with Sn first gave lower ethene selectivity compared to the other impregnation procedures. TPR results indicate that this could be due to a weaker interaction between Pt and Sn in the catalyst. The Pt-Sn catalyst was also compared to LaMnO3, another catalyst which has been reported to be active for oxidative dehydrogenation of ethane. In these experiments Pt-Sn was found to give superior performance when H2 was added to the feed. Pt-Sn was clearly more active towards the oxidation of hydrogen compared to LaMnO3 which was active towards total combustion of hydrocarbons, even when relatively large amounts of hydrogen were present. It seems that ethene is produced mainly in the gas-phase and that the catalyst is important for the oxidation of hydrogen on the surface thus providing heat to the dehydrogenation reactions. However, the results also indicate that there is some ethene production on the Pt-Sn catalyst, either directly or indirectly.

Graphical abstractThe oxidative dehydrogenation of ethane has been studied in a monolithic reactor. PtSn/Al2O3 and LaMnO3 produce high yields of ethene when operated at short contact times. Pt-Sn was found to give superior performance when H2 was added to the feed. PtSn was clearly more active towards the oxidation of hydrogen compared to LaMnO3.Catalysts: 1 wt% Pt-2 wt% Sn. Feed: C2H6/O2/H2 = 4/1/2, total flow rate 2000 is Nml/min. and the flow rate for ethane is 308 Nml/min. Blue line: PtSn/Al2O3, pink line: PtSn/LaMnO3, red line: LaMnO, and green line: Al2O3.Figure optionsDownload full-size imageDownload high-quality image (139 K)Download as PowerPoint slide

Keywords
Ethane; Ethene; Monolith; Pt; Sn
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Ethene production by oxidative dehydrogenation of ethane at short contact times over Pt-Sn coated monoliths
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 378, Issue 1, 15 April 2010, Pages 1–10
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
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Any Questions? feel free to contact us