NAP-XPS and In Situ DRIFTS of the Interaction of CO with Au Nanoparticles Supported by Ce1-xEuxO2 Nanocubes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10422930" target="_blank" >RIV/00216208:11320/20:10422930 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-TR.4vhbnB" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-TR.4vhbnB</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.9b10142" target="_blank" >10.1021/acs.jpcc.9b10142</a>

Jazyk výsledku

angličtina

Název v původním jazyce

NAP-XPS and In Situ DRIFTS of the Interaction of CO with Au Nanoparticles Supported by Ce1-xEuxO2 Nanocubes

Popis výsledku v původním jazyce

Control of metal-support interactions is one of the major challenges in heterogeneous catalysis. In this study, we explored the effect of Eu doping on the metal-support interactions in Au/Ce1-xEuxO2 catalysts applied in the oxidation of CO. We probe the catalysts with CO under realistic conditions by near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). NAP-XPS allows in situ investigation of the surface reducibility of the ceria support and charging of the Au nanoparticles. Both parameters are crucial, as they are responsible for the efficiency of Au/ceria catalysts in the CO oxidation. We found that doping of the ceria support with Eu decreases the reducibility of Ce4+ in the Au/Ce1-xEuxO2 system and the population of Au delta+ sites. We identified the available CO adsorption sites on Au/ceria (Au delta-, Au-0, and Au delta+) in the typical temperature window of the CO oxidation reaction by in situ DRIFTS. We found that the difference in the catalytic activity of Au/CeO2 and Au/Ce0.80Eu0.20O2 does not origin from an electronic effect of the Eu dopant or different adsorption sites but from the size of the Au nanoparticles. The most active Au nanoparticles are very small, reactive Au nanoparticles, which are exclusively present on the undoped ceria support.

Název v anglickém jazyce

NAP-XPS and In Situ DRIFTS of the Interaction of CO with Au Nanoparticles Supported by Ce1-xEuxO2 Nanocubes

Popis výsledku anglicky

Control of metal-support interactions is one of the major challenges in heterogeneous catalysis. In this study, we explored the effect of Eu doping on the metal-support interactions in Au/Ce1-xEuxO2 catalysts applied in the oxidation of CO. We probe the catalysts with CO under realistic conditions by near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). NAP-XPS allows in situ investigation of the surface reducibility of the ceria support and charging of the Au nanoparticles. Both parameters are crucial, as they are responsible for the efficiency of Au/ceria catalysts in the CO oxidation. We found that doping of the ceria support with Eu decreases the reducibility of Ce4+ in the Au/Ce1-xEuxO2 system and the population of Au delta+ sites. We identified the available CO adsorption sites on Au/ceria (Au delta-, Au-0, and Au delta+) in the typical temperature window of the CO oxidation reaction by in situ DRIFTS. We found that the difference in the catalytic activity of Au/CeO2 and Au/Ce0.80Eu0.20O2 does not origin from an electronic effect of the Eu dopant or different adsorption sites but from the size of the Au nanoparticles. The most active Au nanoparticles are very small, reactive Au nanoparticles, which are exclusively present on the undoped ceria support.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/LM2018116" target="_blank" >LM2018116: Laboratoř fyziky povrchů - Optická dráha pro výzkum materiálů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

—

Svazek periodika

124

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

5647-5656

Kód UT WoS článku

000526394800017

EID výsledku v databázi Scopus

2-s2.0-85082308993