Gas-Phase and Aqueous Photocatalytic Oxidation of Methylamine: The Reaction Pathways
Photocatalytic oxidation (PCO) of methylamine (MA) on titanium dioxide in aqueous and gaseous phases was studied. A simple batch glass reactor for aqueous PCO and an annular continuous flow reactor for the gas-phase PCO were used. Maximum aqueous PCO efficiency was achieved in alkaline media. Two me...
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| Format: | Article |
| Language: | English |
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Wiley
2007-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2007/32524 |
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| author | Anna Kachina Sergei Preis German Charles Lluellas Juha Kallas |
| author_facet | Anna Kachina Sergei Preis German Charles Lluellas Juha Kallas |
| author_sort | Anna Kachina |
| collection | DOAJ |
| description | Photocatalytic oxidation (PCO) of methylamine (MA) on titanium dioxide in aqueous
and gaseous phases was studied. A simple batch glass reactor for aqueous PCO and an
annular continuous flow reactor for the gas-phase PCO were used. Maximum aqueous PCO efficiency was achieved in alkaline media. Two mechanisms of aqueous PCO—decomposition to formate and ammonia, and oxidation of organic nitrogen directly to nitrite—lead ultimately to CO2, water, ammonia, and
nitrate: formate and nitrite were observed as intermediates. A part of the ammonia formed in the reaction was oxidized to nitrite and nitrate. Volatile PCO products of MA included ammonia, nitrogen dioxide (NO2), nitrous oxide (N2O), carbon dioxide, and water. Thermal catalytic oxidation (TCO) resulted in the formation of ammonia, hydrogen cyanide, carbon monoxide, carbon dioxide, and water. The gas-phase PCO kinetics is described by the monomolecular Langmuir-Hinshelwood model.
No deactivation of TiO2
catalyst was observed. |
| format | Article |
| id | doaj-art-1b520bec4409477a9e191a1ecd037ca3 |
| institution | OA Journals |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2007-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-1b520bec4409477a9e191a1ecd037ca32025-08-20T02:01:50ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2007-01-01200710.1155/2007/3252432524Gas-Phase and Aqueous Photocatalytic Oxidation of Methylamine: The Reaction PathwaysAnna Kachina0Sergei Preis1German Charles Lluellas2Juha Kallas3Department of Chemical Engineering, Lappeenranta University of Technology, P.O. Box 20, Lappeenranta 53851, FinlandDepartment of Chemical Engineering, Lappeenranta University of Technology, P.O. Box 20, Lappeenranta 53851, FinlandDepartment of Chemical Engineering, University of Barcelona, c/Martí i Franquès 1-11, Barcelona 08028, SpainDepartment of Chemical Engineering, Lappeenranta University of Technology, P.O. Box 20, Lappeenranta 53851, FinlandPhotocatalytic oxidation (PCO) of methylamine (MA) on titanium dioxide in aqueous and gaseous phases was studied. A simple batch glass reactor for aqueous PCO and an annular continuous flow reactor for the gas-phase PCO were used. Maximum aqueous PCO efficiency was achieved in alkaline media. Two mechanisms of aqueous PCO—decomposition to formate and ammonia, and oxidation of organic nitrogen directly to nitrite—lead ultimately to CO2, water, ammonia, and nitrate: formate and nitrite were observed as intermediates. A part of the ammonia formed in the reaction was oxidized to nitrite and nitrate. Volatile PCO products of MA included ammonia, nitrogen dioxide (NO2), nitrous oxide (N2O), carbon dioxide, and water. Thermal catalytic oxidation (TCO) resulted in the formation of ammonia, hydrogen cyanide, carbon monoxide, carbon dioxide, and water. The gas-phase PCO kinetics is described by the monomolecular Langmuir-Hinshelwood model. No deactivation of TiO2 catalyst was observed.http://dx.doi.org/10.1155/2007/32524 |
| spellingShingle | Anna Kachina Sergei Preis German Charles Lluellas Juha Kallas Gas-Phase and Aqueous Photocatalytic Oxidation of Methylamine: The Reaction Pathways International Journal of Photoenergy |
| title | Gas-Phase and Aqueous Photocatalytic Oxidation of Methylamine: The Reaction Pathways |
| title_full | Gas-Phase and Aqueous Photocatalytic Oxidation of Methylamine: The Reaction Pathways |
| title_fullStr | Gas-Phase and Aqueous Photocatalytic Oxidation of Methylamine: The Reaction Pathways |
| title_full_unstemmed | Gas-Phase and Aqueous Photocatalytic Oxidation of Methylamine: The Reaction Pathways |
| title_short | Gas-Phase and Aqueous Photocatalytic Oxidation of Methylamine: The Reaction Pathways |
| title_sort | gas phase and aqueous photocatalytic oxidation of methylamine the reaction pathways |
| url | http://dx.doi.org/10.1155/2007/32524 |
| work_keys_str_mv | AT annakachina gasphaseandaqueousphotocatalyticoxidationofmethylaminethereactionpathways AT sergeipreis gasphaseandaqueousphotocatalyticoxidationofmethylaminethereactionpathways AT germancharleslluellas gasphaseandaqueousphotocatalyticoxidationofmethylaminethereactionpathways AT juhakallas gasphaseandaqueousphotocatalyticoxidationofmethylaminethereactionpathways |