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Effect of NOx and C3H6 partial pressures on the activity of Pt-beta-coated cordierite monoliths for deNOx C3H6-SCR

Paper ID Volume ID Publish Year Pages File Format Full-Text
44556 46041 2006 6 PDF Available
Title
Effect of NOx and C3H6 partial pressures on the activity of Pt-beta-coated cordierite monoliths for deNOx C3H6-SCR
Abstract

The influence of NOx and C3H6 partial pressures (from 500 to 2000 ppm) in NOx reduction under O2-rich conditions, catalyzed by a Pt-beta-coated monolith, has been studied. Reactivity measurements in the temperature range from 170 to 240 °C were carried out in a horizontal reactor at 5600 h−1. NOx reduction is not affected by C3H6 and NOx concentration from 170 to 190 °C, only depending on temperature. Above 190 °C, NOx reduction increases as the NOx/C3H6 ratio decreases. The temperatures for the maximum NOx reduction and total C3H6 conversion are not coupled for all gas compositions. At temperatures lower than 200 °C, C3H6–NOx reaction is predominant, and above a certain temperature that depends on the gas composition, the C3H6–O2 reaction is the main C3H6-conversion pathway. This behaviour is consistent with NOx reduction and C3H6 conversion activation energies (72 ± 11 and 133 ± 18 kJ/mol, respectively). At temperature higher than 200 °C, the mass transfer of reactants affects the overall reaction rate. For practical application, the temperature window of the process is between 190 and 220 °C, but the actual temperature must be selected depending on the gas composition.

Keywords
Pt catalyst; Beta zeolite; Cordierite monolith; deNOx
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Effect of NOx and C3H6 partial pressures on the activity of Pt-beta-coated cordierite monoliths for deNOx C3H6-SCR
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 302, Issue 2, 11 April 2006, Pages 244–249
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