Unraveling the Effects of Reducing and Oxidizing Pretreatments and Humidity on the Surface Chemistry of the Ru/CeO2 Catalyst during Propane Oxidation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F25%3A00604979" target="_blank" >RIV/61388955:_____/25:00604979 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/25:10497935 RIV/00216208:11310/25:10497935

Result on the web

<a href="https://hdl.handle.net/11104/0362541" target="_blank" >https://hdl.handle.net/11104/0362541</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.4c08033" target="_blank" >10.1021/acs.jpcc.4c08033</a>

Result language

angličtina

Original language name

Unraveling the Effects of Reducing and Oxidizing Pretreatments and Humidity on the Surface Chemistry of the Ru/CeO2 Catalyst during Propane Oxidation

Original language description

This work investigates the surface chemistry of the Ru/CeO2 catalyst under varying pretreatment conditions and during the oxidation of propane, focusing on both dry and humid environments. Our results show that the Ru/CeO2 catalyst calcined in O2 at 500 °C initiates propane oxidation at 200 °C, achieves high conversion rates above 400 °C, and demonstrates almost no change in activity in the presence of water vapor across the entire studied temperature range of 200–500 °C. Prereduction of the oxidized Ru/CeO2 catalyst in H2 significantly enhances its activity, though this enhancement diminishes at higher temperatures. Adding water to the reaction mixture boosts the low-temperature activity of the prereduced catalyst but decreases it at 300–400 °C. Several ex-situ analytical techniques in combination with the in-situ NAP-XPS analysis reveal that while exposed to oxygen, Ru nanoparticles on the ceria surface oxidize to form RuO2 below 200 °C and volatile RuOx (x > 2) at higher temperatures. The presence of water vapor in the reaction mixture leads to the transformation of RuO2 into ruthenium hydroxide at 200 °C, which, in turn, facilitates propane oxidation. At higher temperatures, the water does not have much influence on the oxidation state of Ru but slightly inhibits its evaporation from the surface. It is also demonstrated that Ru in the Ru/CeO2 catalyst exists predominantly in the Run+ (n > 4) oxidation states at typical VOC oxidation temperatures rather than the expected Ru4+ state.

Czech name

—

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

10403 - Physical chemistry

Project

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

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

1932-7455

Volume of the periodical

129

Issue of the periodical within the volume

3

Country of publishing house

US - UNITED STATES

Number of pages

12

Pages from-to

1746-1757

UT code for WoS article

001398002400001

EID of the result in the Scopus database

2-s2.0-85215840518