Experimental study of CO and propylene co-oxidation on Pt/Al2O3

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F17%3A43914097" target="_blank" >RIV/60461373:22340/17:43914097 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Experimental study of CO and propylene co-oxidation on Pt/Al2O3

Popis výsledku v původním jazyce

The world?s concerns about global warming and undesirable impact of pollutants contained in the exhaust gases on human health lead to gradual tightening of emission limits. Ideally, there is a complete oxidation of fuel to carbon dioxide and water steam during the combustion process. However, there are several undesired by-products due to side reactions. The most significant pollutants in the automotive exhaust gas are carbon monoxide, nitrogen oxides, unburnt hydrocarbons and particulate matter (soot). These components need to be converted into non-toxic nitrogen, carbon dioxide and water using the exhaust gas catalyst. This study is focused on the study of reaction mechanism leading to so called double CO light-off effect. Normally, the CO conversion monotonously increases with temperature as the rate coefficient exponentially increases. However, it has been observed that under certain operating conditions the CO conversion increase in the complete exhaust gas mixture may stop or even reverse in a range of temperatures, and the increase of CO conversion and is achieved again only at much higher temperature. It was reported that during propene oxidation several intermediates appear on the catalyst surface, especially formate (HCCO-) and acetate (CH3OO-). These constituents may accumulate on the catalyst surface and block active platinum sites (Hazlett &amp; Epling, 2016), leading to inhibition of CO oxidation rate. The inhibition diminishes after their complete oxidation at higher temperature. In this paper we investigate the impact of propene oxidation and amount of other constituents in the exhaust gas mixture (namely O2 and NO) on the CO light-off behavior. 64?2000 znaků. Anotace nesmí být totožná s názvem.

Název v anglickém jazyce

Experimental study of CO and propylene co-oxidation on Pt/Al2O3

Popis výsledku anglicky

The world?s concerns about global warming and undesirable impact of pollutants contained in the exhaust gases on human health lead to gradual tightening of emission limits. Ideally, there is a complete oxidation of fuel to carbon dioxide and water steam during the combustion process. However, there are several undesired by-products due to side reactions. The most significant pollutants in the automotive exhaust gas are carbon monoxide, nitrogen oxides, unburnt hydrocarbons and particulate matter (soot). These components need to be converted into non-toxic nitrogen, carbon dioxide and water using the exhaust gas catalyst. This study is focused on the study of reaction mechanism leading to so called double CO light-off effect. Normally, the CO conversion monotonously increases with temperature as the rate coefficient exponentially increases. However, it has been observed that under certain operating conditions the CO conversion increase in the complete exhaust gas mixture may stop or even reverse in a range of temperatures, and the increase of CO conversion and is achieved again only at much higher temperature. It was reported that during propene oxidation several intermediates appear on the catalyst surface, especially formate (HCCO-) and acetate (CH3OO-). These constituents may accumulate on the catalyst surface and block active platinum sites (Hazlett &amp; Epling, 2016), leading to inhibition of CO oxidation rate. The inhibition diminishes after their complete oxidation at higher temperature. In this paper we investigate the impact of propene oxidation and amount of other constituents in the exhaust gas mixture (namely O2 and NO) on the CO light-off behavior. 64?2000 znaků. Anotace nesmí být totožná s názvem.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

<a href="/cs/project/GA17-26018S" target="_blank" >GA17-26018S: Reakční kinetika v oxidačních katalyzátorech pro konverzi dieselových výfukových plynů za nízkých teplot</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

PROCEEDINGS 44th International Conference of the Slovak Society of Chemical Engineering

ISBN

978-80-89597-58-1

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

7

Strana od-do

760-766

Název nakladatele

Slovak Society of Chemical Engineering

Místo vydání

Bratislava

Místo konání akce

Demänovská dolina

Datum konání akce

22. 5. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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