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Dehydrogenation of propane over Pt/KL catalyst: Investigating the role of L-zeolite structure on catalyst performance using isotope labeling

Paper ID Volume ID Publish Year Pages File Format Full-Text
41549 45892 2010 7 PDF Available
Title
Dehydrogenation of propane over Pt/KL catalyst: Investigating the role of L-zeolite structure on catalyst performance using isotope labeling
Abstract

Dehydrogenation of propane using an equimolar mixture of propane-d0 and propane-d8 was investigated over 1%Pt/KL and 1%Pt/SiO2 at atmospheric pressure and different reaction temperatures. A normal kinetic isotope effect exists (kH/kD = 1.4–1.5) when the reaction is conducted on Pt/KL at different temperatures (400, 500, and 600 °C), suggesting that C–H bond activation is involved in the kinetically relevant steps. Furtheremore, there is hardly any H–D exchange in the recovered propane during dehydrogenation at temperatures above 400 °C, suggesting that adsorption and subsequent dehydrogenation of propane are essentially irreversible and that C–H bond activation is the rate determining step. Unlike the case of hexane aromatization, the unique structure of L-zeolite does not help in controlling the entry of propane molecules into the lobes of the L-zeolite containing the active sites; hence, bimolecular reactions do occur, leading to coke formation and catalyst deactivation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (88 K)Download as PowerPoint slideResearch highlights▶ An NKIE exists during propane (H and D labeled) dehydrogenation over Pt/KL. ▶ Catalyst deactivation occurred from carbon deposition due to bimolecular reactions. ▶ The unique structure of Pt/KL did not enhance performance with C3 as with C6.

Keywords
Dehydrogenation; Propane; C3H8; C3D8; Pt/KL; L-zeolite; Isotope effect; Diffusion; H–D exchange
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Dehydrogenation of propane over Pt/KL catalyst: Investigating the role of L-zeolite structure on catalyst performance using isotope labeling
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 390, Issues 1–2, 20 December 2010, Pages 264–270
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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Any Questions? feel free to contact us