The influence of support composition on the activity of Cu:Ce catalysts for selective catalytic reduction of NO by CO in the presence of excess oxygen

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F20%3A43958774" target="_blank" >RIV/49777513:23640/20:43958774 - isvavai.cz</a>

Výsledek na webu

<a href="https://pubs.rsc.org/en/content/articlelanding/2020/nj/c9nj04335g#!divCitation" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2020/nj/c9nj04335g#!divCitation</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c9nj04335g" target="_blank" >10.1039/c9nj04335g</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The influence of support composition on the activity of Cu:Ce catalysts for selective catalytic reduction of NO by CO in the presence of excess oxygen

Popis výsledku v původním jazyce

The catalytic activity of a series of Cu1:Ce3 catalysts supported on different supports (CNTs, AC, TiO2, gamma-Al2O3, and SiC) was studied for NO reduction by CO in the presence of excess oxygen. The effects of the support on the physicochemical properties of the Cu1:Ce3 catalysts were characterized by using SEM, TEM, N2 adsorption–desorption, FTIR spectroscopy, XRD, XPS, CO-TPD, and NO-TPD techniques. The highest activity in the presence of oxygen was observed for the Cu1:Ce3/Al2O3 catalyst, and the NO conversion of 71.8% was obtained at 420 1C in the presence of 5% oxygen. The catalytic activity of the catalysts was significantly related to the synergistic interactions between surface oxygen vacancies and Cu+ species in the catalysts, as well as the electron transfer and metal/support interface. The high activity of the Al2O3 supported catalyst in the presence of oxygen is attributed to the presence of catalytically active centers on the support as well as on the surface of the supported crystallites. The NO conversion slightly increased after increasing the O2 concentration from 2% to 5%, due to the adsorption of more O2 on the surface, thus providing more adsorbed O, which reacted with adsorbed CO to form CO2 and provide oxygen vacancy for NO adsorption and dissociation. The adsorbed O can react with NO and form NO2, which quickly reacts with CO to form N2 and CO2. A possible reaction mechanism was proposed for the reaction in the presence of excess oxygen.

Název v anglickém jazyce

The influence of support composition on the activity of Cu:Ce catalysts for selective catalytic reduction of NO by CO in the presence of excess oxygen

Popis výsledku anglicky

The catalytic activity of a series of Cu1:Ce3 catalysts supported on different supports (CNTs, AC, TiO2, gamma-Al2O3, and SiC) was studied for NO reduction by CO in the presence of excess oxygen. The effects of the support on the physicochemical properties of the Cu1:Ce3 catalysts were characterized by using SEM, TEM, N2 adsorption–desorption, FTIR spectroscopy, XRD, XPS, CO-TPD, and NO-TPD techniques. The highest activity in the presence of oxygen was observed for the Cu1:Ce3/Al2O3 catalyst, and the NO conversion of 71.8% was obtained at 420 1C in the presence of 5% oxygen. The catalytic activity of the catalysts was significantly related to the synergistic interactions between surface oxygen vacancies and Cu+ species in the catalysts, as well as the electron transfer and metal/support interface. The high activity of the Al2O3 supported catalyst in the presence of oxygen is attributed to the presence of catalytically active centers on the support as well as on the surface of the supported crystallites. The NO conversion slightly increased after increasing the O2 concentration from 2% to 5%, due to the adsorption of more O2 on the surface, thus providing more adsorbed O, which reacted with adsorbed CO to form CO2 and provide oxygen vacancy for NO adsorption and dissociation. The adsorbed O can react with NO and form NO2, which quickly reacts with CO to form N2 and CO2. A possible reaction mechanism was proposed for the reaction in the presence of excess oxygen.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/LO1402" target="_blank" >LO1402: CENTEM+</a><br>

Návaznosti

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

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

NEW JOURNAL OF CHEMISTRY

ISSN

1144-0546

e-ISSN

—

Svazek periodika

44

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

709-718

Kód UT WoS článku

000509327200009

EID výsledku v databázi Scopus

2-s2.0-85078434751