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An in situ FTIR study of the plasma- and thermally-driven reaction of isopropyl alcohol at CeO2: Evidence for a loose transition state involving Ce3+?

Lookup NU author(s): Professor Paul Christensen, Zeinab Mashhadani, Mohd Md Ahid, Professor David Manning, Dr Michael Carroll

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Royal Society of Chemistry, 2019.

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Abstract

© 2018 the Owner Societies. This paper reports on the thermally-driven and non-thermal plasma-driven reaction of IsoPropyl Alcohol (IPA) on ceria (CeO2) with the aim to investigate the differences between plasma catalytic interactions and the analogous thermal reactions. Both were studied by in situ infrared spectroscopy: using diffuse reflectance for the thermal reaction and reflectance infrared for the plasma. For the thermal reaction, the activity towards the formation of acetone and acetaldehyde and, at higher temperatures, CO2 was dependent upon the coverage of surface carbonates and bicarbonates, suggesting at least some of these species blocked the relevant active sites. However, for the first time, methane and cold CO was observed and this was interpreted in terms of a roaming mechanism taking place at the surface via a loose transition state. By contrast, the plasma-driven process was not inhibited by adsorbed carbonaceous species producing acetone followed by isophorone and a polymethylacetylene-like polymer. Comparisons are made between the equivalent thermal and plasma reactions of isopropyl alcohol on Macor and tin oxide surfaces. On Macor the plasma produced similar products whereas on tin oxide there was no reaction. This suggests that the selection of catalysts for plasma processing cannot necessarily be determined from the equivalent thermal process.


Publication metadata

Author(s): Christensen PA, Mashhadani ZTAW, Md Ali AHB, Manning DAC, Carroll MA, Martin PA

Publication type: Article

Publication status: Published

Journal: Physical Chemistry Chemical Physics

Year: 2019

Volume: 21

Issue: 3

Pages: 1354-1366

Online publication date: 19/12/2018

Acceptance date: 19/12/2018

Date deposited: 25/02/2019

ISSN (print): 1463-9076

ISSN (electronic): 1463-9084

Publisher: Royal Society of Chemistry

URL: https://doi.org/10.1039/C8CP05983G

DOI: 10.1039/c8cp05983g

PubMed id: 30601497


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