Mechanistic Insights of Ethanol Steam Reforming over Ni-CeOx(111): The Importance of Hydroxyl Groups for Suppressing Coke Formation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10319585" target="_blank" >RIV/00216208:11320/15:10319585 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1021/acs.jpcc.5b04310" target="_blank" >http://dx.doi.org/10.1021/acs.jpcc.5b04310</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.5b04310" target="_blank" >10.1021/acs.jpcc.5b04310</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mechanistic Insights of Ethanol Steam Reforming over Ni-CeOx(111): The Importance of Hydroxyl Groups for Suppressing Coke Formation

Popis výsledku v původním jazyce

We have studied the reaction of ethanol and water over Ni-CeO2-x(111) model surfaces to elucidate the mechanistic steps associated with the ethanol steam reforming (ESR) reaction. Our results provide insights about the importance of hydroxyl groups to the ESR reaction over Ni-based catalysts. Systematically, we have investigated the reaction of ethanol on Ni-CeO2-x(111) at varying Ce3+ concentrations (CeO1.8-2.0) with absence/presence of water using a combination of soft X-ray photoelectron spectroscopy(sXPS) and temperature-programmed desorption (TPD). Consistent with previous reports, upon annealing, metallic Ni formed on reduced ceria while NiO was the main component on fully oxidized ceria. Ni is the active phase leading to both the C-C and C-H cleavage of ethanol but is also responsible for carbon accumulation or coking. We have identified a Ni3C phase that formed prior to the formation of coke. At temperatures above 600 K, the lattice oxygen from ceria and the hydroxyl groups fr

Název v anglickém jazyce

Mechanistic Insights of Ethanol Steam Reforming over Ni-CeOx(111): The Importance of Hydroxyl Groups for Suppressing Coke Formation

Popis výsledku anglicky

We have studied the reaction of ethanol and water over Ni-CeO2-x(111) model surfaces to elucidate the mechanistic steps associated with the ethanol steam reforming (ESR) reaction. Our results provide insights about the importance of hydroxyl groups to the ESR reaction over Ni-based catalysts. Systematically, we have investigated the reaction of ethanol on Ni-CeO2-x(111) at varying Ce3+ concentrations (CeO1.8-2.0) with absence/presence of water using a combination of soft X-ray photoelectron spectroscopy(sXPS) and temperature-programmed desorption (TPD). Consistent with previous reports, upon annealing, metallic Ni formed on reduced ceria while NiO was the main component on fully oxidized ceria. Ni is the active phase leading to both the C-C and C-H cleavage of ethanol but is also responsible for carbon accumulation or coking. We have identified a Ni3C phase that formed prior to the formation of coke. At temperatures above 600 K, the lattice oxygen from ceria and the hydroxyl groups fr

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

—

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

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

119

Číslo periodika v rámci svazku

32

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

18248-18256

Kód UT WoS článku

000359683800028

EID výsledku v databázi Scopus

2-s2.0-84939154857