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The role of pore size on the thermal stability of zeolite supported Cu SCR catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
54707 47023 2014 8 PDF Available
Title
The role of pore size on the thermal stability of zeolite supported Cu SCR catalysts
Abstract

•The pore size affects the hydrothermal stability of zeolite supported Cu catalysts.•Small pore catalysts are more stable than large or medium pore catalysts.•In situ XRD experiments were performed to understand the pore size effects.•Destructive Cu/Al2O3 interaction is minimized on the small pore zeolite catalysts.•This is attributed to the steric restriction in the small pore zeolite structure.

A comparison study on the hydrothermal stability of Cu SCR catalysts supported on an 8-ring small pore chabazite and a 12-ring large pore beta zeolite was performed to understand why small pore zeolite supported Cu catalysts are in general hydrothermally more stable than medium pore or large pore zeolite supported Cu catalysts and how different pore sizes affect the hydrothermal stability of the catalysts. In situ XRD hydrothermal experiments show that, even though the parent chabazite and beta zeolites have comparable hydrothermal stability and both can maintain their zeolite framework structure after a 900 °C hydrothermal exposure, the presence of Cu in the Cu/beta catalyst accelerates the collapse of the BEA framework structure at temperatures above 800 °C whereas Cu in the Cu/chabazite catalyst has little effect on the CHA framework structure. The loss of beta zeolite framework structure is due to a detrimental Cu/Al2O3 interaction. It is proposed that the constricting dimensions of the small openings in a small pore zeolite can hinder the destructive Cu/Al2O3 interaction as well as the zeolite dealumination process, hence significantly improving the hydrothermal stability of the small pore zeolite supported Cu catalyst.

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Keywords
Cu/zeolite SCR catalysts; Hydrothermal stability; Zeolite pore size effect; In situ XRD; Cu/Al2O3 interaction
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The role of pore size on the thermal stability of zeolite supported Cu SCR catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 231, 1 August 2014, Pages 56–63
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