The role of chromium in iron-based high-temperature water-gas shift catalysts under industrial conditions
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10439410" target="_blank" >RIV/00216208:11320/21:10439410 - isvavai.cz</a>
Výsledek na webu
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=XhQ1~gmcCO" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=XhQ1~gmcCO</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.apcatb.2021.120465" target="_blank" >10.1016/j.apcatb.2021.120465</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
The role of chromium in iron-based high-temperature water-gas shift catalysts under industrial conditions
Popis výsledku v původním jazyce
Chromium promotion of iron oxide based water-gas shift (WGS) catalysts prepared via co-precipitation/calcination was investigated. Mossbauer spectroscopy and XRD evidence that chromium is incorporated in the calcined hematite (alpha-Fe2O3) precursor irrespective of the doping level (0-12 wt.%). CO-TPR shows chromium delays the reduction of hematite and the active magnetite (Fe3O4) phase. WGS activity was evaluated under realistic conditions for 4 days. Enhanced CO conversion was observed with increased chromium doping. Mossbauer spectra indicate that chromium incorporates into octahedral sites of magnetite and prevents reduction of Fe3+ to Fe2+ during formation of the active phase, leading to an increased Fe3+/Fe2+ ratio in octahedral sites. The higher Fe3+/Fe2+ ratio did not affect the high CO conversion associated with the structural stabilization mechanism of Cr-doping. Interpretation of the Mossbauer spectra was supported by computational modelling of various chromium and vacancy-doped magnetite structures. The bulk structure of an in situ prepared chromium-doped high-temperature WGS catalyst is best described as a partially oxidized chromium-doped magnetite phase. No surface effects of Cr-doping were found.
Název v anglickém jazyce
The role of chromium in iron-based high-temperature water-gas shift catalysts under industrial conditions
Popis výsledku anglicky
Chromium promotion of iron oxide based water-gas shift (WGS) catalysts prepared via co-precipitation/calcination was investigated. Mossbauer spectroscopy and XRD evidence that chromium is incorporated in the calcined hematite (alpha-Fe2O3) precursor irrespective of the doping level (0-12 wt.%). CO-TPR shows chromium delays the reduction of hematite and the active magnetite (Fe3O4) phase. WGS activity was evaluated under realistic conditions for 4 days. Enhanced CO conversion was observed with increased chromium doping. Mossbauer spectra indicate that chromium incorporates into octahedral sites of magnetite and prevents reduction of Fe3+ to Fe2+ during formation of the active phase, leading to an increased Fe3+/Fe2+ ratio in octahedral sites. The higher Fe3+/Fe2+ ratio did not affect the high CO conversion associated with the structural stabilization mechanism of Cr-doping. Interpretation of the Mossbauer spectra was supported by computational modelling of various chromium and vacancy-doped magnetite structures. The bulk structure of an in situ prepared chromium-doped high-temperature WGS catalyst is best described as a partially oxidized chromium-doped magnetite phase. No surface effects of Cr-doping were found.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10403 - Physical chemistry
Návaznosti výsledku
Projekt
—
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2021
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Applied Catalysis B: Environmental
ISSN
0926-3373
e-ISSN
—
Svazek periodika
297
Číslo periodika v rámci svazku
25 June 2021
Stát vydavatele periodika
NL - Nizozemsko
Počet stran výsledku
14
Strana od-do
120465
Kód UT WoS článku
000696992600002
EID výsledku v databázi Scopus
2-s2.0-85109081027