Modeling of two-step CO oxidation light-off on Pt/gamma-Al2O3 in the presence of C3H6 and NOx

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F18%3A43916512" target="_blank" >RIV/60461373:22340/18:43916512 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0926337318302790?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0926337318302790?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apcatb.2018.03.081" target="_blank" >10.1016/j.apcatb.2018.03.081</a>

Result language

angličtina

Original language name

Modeling of two-step CO oxidation light-off on Pt/gamma-Al2O3 in the presence of C3H6 and NOx

Original language description

Abatement of pollutants in automotive exhaust converters can be negatively affected by interactions of reaction intermediates with the catalyst surface. This paper focuses on a specific inhibition of CO oxidation on Pt/gamma-Al2O3 catalyst by C3H6 oxidation intermediates, leading to a so-called two-step CO light-off behavior. Two reaction pathways contributing to a temporary decrease of CO conversion during a temperature-programmed co-oxidation of CO and C3H6 are identified: (i) accumulation of C3H6 oxidation intermediates on the catalyst surface that block active sites and progressively inhibit both CO oxidation and total C3H6 oxidation, and (ii) CO by-product formation during propylene oxidation. The latter pathway seems to play a minor role while the inhibition effect dominates. The phenomenon is most pronounced at lower (nearly stoichiometric) oxygen concentrations and in the presence of NO. This indicates that the initial formation of C3H6 oxidation intermediates is less sensitive to O-2 and NO concentrations, while the total oxidation steps depend more strongly on the actual exhaust gas composition. A novel global reaction kinetic model is proposed that captures all the experimentally observed phenomena including transient accumulation of the reaction intermediates on the catalyst surface and the resulting impact on CO and C3H6 conversion. The developed model covers a wide range of operating conditions, from three-way catalyst (stoichiometric mixture) to diesel oxidation catalyst (lean mixture).

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20402 - Chemical process engineering

Project

<a href="/en/project/GA17-26018S" target="_blank" >GA17-26018S: Low temperature reaction kinetics in oxidation catalysts for diesel exhaust gas aftertreatment</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Applied Catalysis B:Environment

ISSN

0926-3373

e-ISSN

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Volume of the periodical

233

Issue of the periodical within the volume

neuvedeno

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

8

Pages from-to

167-174

UT code for WoS article

000434888600018

EID of the result in the Scopus database

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