Kinetic and mechanistic study of CO oxidation over nanocomposite Cu-Fe-Al oxide catalysts

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10423829" target="_blank" >RIV/00216208:11320/20:10423829 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ZjphLhgQg9" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ZjphLhgQg9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/cctc.202000852" target="_blank" >10.1002/cctc.202000852</a>

Result language

angličtina

Original language name

Kinetic and mechanistic study of CO oxidation over nanocomposite Cu-Fe-Al oxide catalysts

Original language description

The oxidation of CO has been studied over Fe-Al and Cu-Fe-Al oxide nanocomposite catalysts prepared by melting of copper, iron, and aluminum nitrates. It was shown that the addition of copper significantly increases the catalytic activity of the Fe-Al nanocomposites. The catalysts were characterized by low-temperature nitrogen adsorption, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). It was found that the catalysts contain Fe(2)O(3)with the hematite structure modified by aluminum. Copper in the three-component catalyst is in the Cu(2+)state, forming CuO and CuFeO(x)clusters on the catalyst surface. An increase in the copper content leads to the formation of a Cu(x)Al(y)Fe(3-x-y)O(4)spinel phase.In situXPS study showed that a treatment of the catalysts in a CO flow leads to the reduction of both copper and iron cations into the metallic state. In contrast, a treatment in a CO/O(2)flow leads only to partial reduction of Cu(2+)to Cu1+, while Fe(3+)are not reduced. The tests of catalytic activity performed in a flow fixed bed reactor using a CO pulse technique showed that the light-off temperature in the oxidation of CO over the Cu-Fe-Al nanocomposite catalysts depends on the copper content. The minimal light-off temperature was achieved over the catalyst containing 5 wt% CuO. In addition, we performed kinetic measurements in a differential reactor and obtained the activation energy and the reaction orders with respect to the reactants. The reaction mechanism of the catalytic oxidation of CO and the origin of active species are discussed.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/LM2018116" target="_blank" >LM2018116: Surface Physics Laboratory - Materials Science Beamline</a><br>

Continuities

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

Publication year

2020

Confidentiality

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

Name of the periodical

ChemCatChem

ISSN

1867-3880

e-ISSN

—

Volume of the periodical

12

Issue of the periodical within the volume

19

Country of publishing house

DE - GERMANY

Number of pages

11

Pages from-to

4911-4921

UT code for WoS article

000567671800001

EID of the result in the Scopus database

2-s2.0-85090060989