Ambient pressure CO2 hydrogenation over a cobalt/manganese-oxide nanostructured interface: A combined in situ and ex situ study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A90116%2F20%3A10513089" target="_blank" >RIV/00216208:90116/20:10513089 - isvavai.cz</a>

Výsledek na webu

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

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jcat.2020.03.028" target="_blank" >10.1016/j.jcat.2020.03.028</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Ambient pressure CO2 hydrogenation over a cobalt/manganese-oxide nanostructured interface: A combined in situ and ex situ study

Popis výsledku v původním jazyce

We report on a cobalt/manganese-oxide interface catalyst with outstanding activity and selectivity towards methane even at high temperatures and ambient pressure in CO2 hydrogenation. The catalyst was formed from a MnCo2O4-based spinel structure during the oxidative-reductive pretreatment process just before the catalytic tests. Several Mn-, Fe- and Ni-containing cobaltite spinel and reverse spinel structures were tested to find the best overall performer. The reusable MnCo2O4-based structure featured a CO2 consumption rate of similar to 8500 nmol*g(-1)*s(-1). Even though methane is not the thermodynamically favoured product, it was produced with similar to 80% and similar to 50% selectivity at ambient pressure at 673 K and 823 K, respectively. This unexpected finding is linked to the presence of a unique nanostructured Co/Mn(II)O catalyst with a surface composition of Mn3.3Co2.0O4.7 formed after the pretreatment activation step. Over this phase, the reduction of CO2 progresses through bridge bonded formate located at the Co/Mn2+ interface and this is mostly responsible for high temperature methane formation. This hypothesis is proven here by the reported combination of ex-situ XRD, TPR, HRTEM-ED, HAADF-EDX and in-situ NAP-XPS and DRIFTS techniques. (C) 2020 The Authors. Published by Elsevier Inc.

Název v anglickém jazyce

Ambient pressure CO2 hydrogenation over a cobalt/manganese-oxide nanostructured interface: A combined in situ and ex situ study

Popis výsledku anglicky

We report on a cobalt/manganese-oxide interface catalyst with outstanding activity and selectivity towards methane even at high temperatures and ambient pressure in CO2 hydrogenation. The catalyst was formed from a MnCo2O4-based spinel structure during the oxidative-reductive pretreatment process just before the catalytic tests. Several Mn-, Fe- and Ni-containing cobaltite spinel and reverse spinel structures were tested to find the best overall performer. The reusable MnCo2O4-based structure featured a CO2 consumption rate of similar to 8500 nmol*g(-1)*s(-1). Even though methane is not the thermodynamically favoured product, it was produced with similar to 80% and similar to 50% selectivity at ambient pressure at 673 K and 823 K, respectively. This unexpected finding is linked to the presence of a unique nanostructured Co/Mn(II)O catalyst with a surface composition of Mn3.3Co2.0O4.7 formed after the pretreatment activation step. Over this phase, the reduction of CO2 progresses through bridge bonded formate located at the Co/Mn2+ interface and this is mostly responsible for high temperature methane formation. This hypothesis is proven here by the reported combination of ex-situ XRD, TPR, HRTEM-ED, HAADF-EDX and in-situ NAP-XPS and DRIFTS techniques. (C) 2020 The Authors. Published by Elsevier Inc.

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

—

Návaznosti

—

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Journal of Catalysis

ISSN

0021-9517

e-ISSN

1090-2694

Svazek periodika

386

Číslo periodika v rámci svazku

Jun

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

70-80

Kód UT WoS článku

000533629300008

EID výsledku v databázi Scopus

2-s2.0-85083682788