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Experimental and microkinetic modeling of steady-state NO reduction by H2 on Pt/BaO/Al2O3 monolith catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
48408 46505 2008 14 PDF Available
Title
Experimental and microkinetic modeling of steady-state NO reduction by H2 on Pt/BaO/Al2O3 monolith catalysts
Abstract

Experimental results describing the product distribution during the reduction of NO by H2 on Pt/Al2O3 and Pt/BaO/Al2O3 catalysts are presented in the temperature range 30–500 °C and H2/NO feed ratio range of 0.9–2.5. A microkinetic model that describes the kinetics of NO reduction by H2 on Pt/Al2O3 is proposed and most of the kinetic parameters are estimated from either literature data or from thermodynamic constraints. The microkinetic model is combined with the short monolith flow model to simulate the conversions and selectivities corresponding to the experimental conditions. The predicted trends are in excellent qualitative and reasonable quantitative agreement with the experimental results. Both the model and the experiments show that N2O formation is favored at low temperatures and low H2/NO feed ratios, N2 selectivity increases monotonically with temperature for H2/NO feed ratios of 1.2 or less but goes through a maximum at intermediate temperatures (around 100 °C) for H2/NO feed ratios 1.5 or higher. Ammonia formation is favored for H2/NO feed ratios of 1.5 or higher and intermediate temperatures (100–350 °C) buts starts to decompose at a temperature of 400 °C or higher. The microkinetic model is used to determine the surface coverages and explain the trends in the experimentally observed selectivities.

Keywords
NOx; Platinum; Barium; Storage; Reduction; Ammonia; Hydrogen
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Experimental and microkinetic modeling of steady-state NO reduction by H2 on Pt/BaO/Al2O3 monolith catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 77, Issues 3–4, 10 January 2008, Pages 395–408
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
Online Support
Any Questions? feel free to contact us