Reactive interaction of isopropanol with Co3O4 (111) and Pt/Co3O4(111) model catalysts

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10439710" target="_blank" >RIV/00216208:11320/21:10439710 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=TBIlpBcry0" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=TBIlpBcry0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jcat.2021.04.005" target="_blank" >10.1016/j.jcat.2021.04.005</a>

Result language

angličtina

Original language name

Reactive interaction of isopropanol with Co3O4 (111) and Pt/Co3O4(111) model catalysts

Original language description

The structure and chemical composition of the catalyst may change under reaction conditions resulting in changes of the active sites and, thereby, loss of selectivity. In this work, we investigated the reactive interaction of isopropanol with well-defined Co3O4(1 1 1)/Ir(1 0 0) and Pt/Co3O4 (1 1 1)/Ir(1 0 0) model catalysts by means of synchrotron radiation photoelectron spectroscopy (SRPES), near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS), scanning tunneling microscopy (STM), and temperature programmed desorption (TPD). We found that adsorption at 150 K yields molecularly adsorbed isopropanol on both model catalysts accompanied by small fractions of isopropoxide and enolate species on Co3O4(1 1 1) and supported Pt nanoparticles, respectively. The reactive interaction of isopropanolderived species with the model catalysts upon annealing in UHV and in 1 x10(-7) mbar and 1 mbar of isopropanol results in the reduction of Co3O4 (1 1 1) followed by its conversion to CoO(1 1 1) and, finally, to metallic Co and Pt-Co alloy. The mechanism of isopropanol decomposition reveals remarkable sensitivity to the oxidation state and morphology of the model catalysts. On as-prepared Pt/Co3O4(1 1 1) catalyst, Pt particles densely cover the Co3O4(1 1 1) substrate steering isopropanol decomposition to acetone and hydrogen. Selective channels towards acetone and propene, both accompanied by water, open after temperature-driven sintering of the supported Pt particles. The selectivity of these channels is controlled by the degree of reduction of the Co3O4(1 1 1) substrate and the chemical composition of the supported nanoparticles. At high degrees of reduction of Co3O4(1 1 1), the formation of both propene and acetone through selective channels decline due to the strong preference for C-C bond scission. Under NAP conditions, the formation of acetone resumes after complete reduction of model catalysts to metallic Co and Pt-Co alloy. (C) 2021 Elsevier Inc. All rights reserved.

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

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2021

Confidentiality

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

Name of the periodical

Journal of Catalysis

ISSN

0021-9517

e-ISSN

—

Volume of the periodical

398

Issue of the periodical within the volume

Jun

Country of publishing house

US - UNITED STATES

Number of pages

14

Pages from-to

171-184

UT code for WoS article

000658706400005

EID of the result in the Scopus database

2-s2.0-85107433235