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Process intensification in photocatalytic decomposition of formic acid over a TiO2 catalyst by forced periodic modulation of concentration, temperature, flowrate and light intensity

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Ellwood, Thomas, Živković, Luka A., Denissenko, Petr, Abiev, Rufat Sh., Rebrov, Evgeny V. and Petkovska, Menka (2021) Process intensification in photocatalytic decomposition of formic acid over a TiO2 catalyst by forced periodic modulation of concentration, temperature, flowrate and light intensity. Processes, 9 (11). 2046. doi:10.3390/pr9112046 ISSN 2227-9717.

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Official URL: http://dx.doi.org/10.3390/pr9112046

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Abstract

The effect of forced periodic modulation of several input parameters on the rate of photocatalytic decomposition of formic acid over a TiO2 thin film catalyst has been investigated in a continuously stirred tank reactor. The kinetic model was adopted based on the literature and it includes acid adsorption, desorption steps, the formation of photocatalytic active sites and decomposition of the adsorbed species over the active titania sites. A reactor model was developed that describes mass balances of reactive species. The analysis of the reactor was performed with a computer-aided nonlinear frequency response method. Initially, the effect of amplitude and frequency of four input parameters (flowrate, acid concentration, temperature and light intensity) were studied. All single inputs provided only a minor improvement, which did not exceed 4%. However, a modulation of two input parameters, inlet flowrate and the acid molar fraction, considerably improved the acid conversion from 80 to 96%. This is equivalent to a factor of two increase in residence time at steady-state operation at the same temperature and acid concentration.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Formic acid, Formic acid -- Oxidation, Titanium dioxide , Photocatalysis, Plasma engineering
Journal or Publication Title: Processes
Publisher: MDPI
ISSN: 2227-9717
Official Date: 15 November 2021
Dates:
DateEvent
15 November 2021Published
10 November 2021Accepted
Volume: 9
Number: 11
Article Number: 2046
DOI: 10.3390/pr9112046
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 17 November 2021
Date of first compliant Open Access: 17 November 2021
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
20-69-46041[RSF] Russian Science Foundationhttp://dx.doi.org/10.13039/501100006769
810182European Commissionhttp://dx.doi.org/10.13039/501100000780
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