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Assessment of the low-temperature EnviNOx® variant for catalytic N2O abatement over steam-activated FeZSM-5

Paper ID Volume ID Publish Year Pages File Format Full-Text
48391 46505 2008 7 PDF Available
Title
Assessment of the low-temperature EnviNOx® variant for catalytic N2O abatement over steam-activated FeZSM-5
Abstract

Remarkable progress towards implementation of catalytic technology for N2O mitigation in nitric acid plants has been experienced in recent years. EnviNOx®, one of the commercial processes developed by Uhde, accomplishes the tail-gas abatement of N2O and NOx over a single reactor using iron-containing zeolite catalysts. Two variants of the process are available depending on the tail-gas temperature. This manuscript evaluates the low-temperature abatement process (<700 K), where NOx and N2O are selectively reduced by NH3 and CH4, respectively. To this end, activity tests in mixtures with N2O, O2, NO, NH3, and CH4 at different temperatures and partial pressures of reactants were carried out over steam-activated FeZSM-5. Ammonia and nitric oxide strongly inhibit the selective catalytic reduction (SCR) of N2O by CH4, shifting the temperature for N2O conversion over 700 K. Controlled ammonia dosing is required for the efficient operation of the low-temperature EnviNOx® variant over the particular iron zeolite used in this study. The optimal inlet NH3 concentration is determined by the NO concentration in the tail-gas and its temperature. In the absence of NO and NH3, the CH4-SCR of N2O over FeZSM-5 is effective above 623 K. Still, this process cannot retrofit a number of existing plants with lower tail-gas temperatures.

Keywords
EnviNOx®; N2O abatement; Decomposition; Reduction; Iron zeolites; FeZSM-5; Tail-gas; Nitric acid plant
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Assessment of the low-temperature EnviNOx® variant for catalytic N2O abatement over steam-activated FeZSM-5
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 77, Issues 3–4, 10 January 2008, Pages 248–254
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