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A redox model for NO oxidation, NH3 oxidation and high temperature standard SCR over Cu-SSZ-13 by Rohil Daya; Dhruba J. Deka; Anshuman Goswami; Unmesh Menon; Dylan Trandal; William P. Partridge; Saurabh Y. Joshi is a Energy article available to read on EtoBox.

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A kinetic model is developed to predict the influence of temperature and hydrothermal aging on the redox of active Cu sites under standard SCR, NO oxidation and NH 3 oxidation conditions over a practically relevant fullyformulated Cu-SSZ-13 catalyst. NO 2 /N 2 production during NO/NH 3 titration of Cu II sites is utilized to identify rate parameters associated with NO-only RHC (reduction half cycle) and NH 3 -only RHC respectively. Integral N 2 formation during subsequent NO + NH 3 titration is consistent with the production of one NO 2 per two Cu II sites reduced during NO-only RHC and one N 2 per six Cu II sites reduced during NH 3 -only RHC. Decreased reduction of Cu II sites by NO/NH 3 upon hydrothermal aging, along with the production of one NO 2 per two Cu II sites during NO-only RHC, is accordant with the involvement of proximal ZCuOH and oxygen-bridged dimeric Cu II sites. Oxidation of partially solvated and framework coordinated ZCu (Cu I ) sites occurs in presence of O 2 , does not produce N 2 and can lead to the consumption of Brønsted acid sites. A global OHC kinetic model is developed to predict transient and integral N 2 formation during exposure of Cu I sites to a mi

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Author

Rohil Daya; Dhruba J. Deka; Anshuman Goswami; Unmesh Menon; Dylan Trandal; William P. Partridge; Saurabh Y. Joshi

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Energy (Physical Sciences)