Ordered phases of reduced ceria as inverse model catalysts

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10389483" target="_blank" >RIV/00216208:11320/19:10389483 - isvavai.cz</a>

Výsledek na webu

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

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apsusc.2018.09.068" target="_blank" >10.1016/j.apsusc.2018.09.068</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Ordered phases of reduced ceria as inverse model catalysts

Popis výsledku v původním jazyce

Inverse model catalysts represent valuable systems for studying metal-oxide interactions and finite size effects in heterogeneous catalysis. To maximize the potential of model catalytic studies, high level of control over model catalyst properties is desirable. Here we introduce experimental approaches for obtaining inverse ceria/copper model catalysts of well-defined crystallographic phases CeO2, iota-Ce7O12, CeO1.67, and c-Ce2O3 supported on Cu (1 1 1). The presented cerium oxide thin films are ultrathin (2 monolayers), discontinuous, and feature highly defined stoichiometry and crystallographic structure with characteristic (1x1), (root 7x root 7) R19 degrees, (3x3), or (4x4) electron diffraction patterns. Compared to thicker films and bulk ceria, the prepared ultrathin cerium oxides exhibit a distinctly different dependence of the lattice constant on the stoichiometry, and show activation barrier preventing their complete oxidation. These phenomena illustrate that metal-oxide interactions and finite size effects strongly influence the behavior of the presented inverse model catalysts indicating their prospective use in disentangling complex functionalities of ceria/copper catalytic systems.

Název v anglickém jazyce

Ordered phases of reduced ceria as inverse model catalysts

Popis výsledku anglicky

Inverse model catalysts represent valuable systems for studying metal-oxide interactions and finite size effects in heterogeneous catalysis. To maximize the potential of model catalytic studies, high level of control over model catalyst properties is desirable. Here we introduce experimental approaches for obtaining inverse ceria/copper model catalysts of well-defined crystallographic phases CeO2, iota-Ce7O12, CeO1.67, and c-Ce2O3 supported on Cu (1 1 1). The presented cerium oxide thin films are ultrathin (2 monolayers), discontinuous, and feature highly defined stoichiometry and crystallographic structure with characteristic (1x1), (root 7x root 7) R19 degrees, (3x3), or (4x4) electron diffraction patterns. Compared to thicker films and bulk ceria, the prepared ultrathin cerium oxides exhibit a distinctly different dependence of the lattice constant on the stoichiometry, and show activation barrier preventing their complete oxidation. These phenomena illustrate that metal-oxide interactions and finite size effects strongly influence the behavior of the presented inverse model catalysts indicating their prospective use in disentangling complex functionalities of ceria/copper catalytic systems.

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

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Applied Surface Science

ISSN

0169-4332

e-ISSN

—

Svazek periodika

465

Číslo periodika v rámci svazku

Jan

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

557-563

Kód UT WoS článku

000449683100064

EID výsledku v databázi Scopus

2-s2.0-85054161888