Article (Scientific journals)
Study of photocatalytic decomposition of hydrogen peroxide over ramsdellite-MnO2 by O2-pressure monitoring
Páez Martínez, Carlos; Liquet, Dimitri; Calberg, Cédric et al.
2011In Catalysis Communications, 15, p. 132-136
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Keywords :
Manganese dioxide; Hydrogen peroxide decomposition; Photocatalytic activity
Abstract :
[en] The catalytic and photocatalytic activities of ramsdellite type manganese oxide, R-MnO2 were studied from the initial rate of decomposition of H2O2 in aqueous solution. The kinetic study was followed by the production of O2 via gas pressure monitoring (O2-monitored method), in the dark and under visible light irradiation (λ≥400 nm), at 20 °C. Experimental data showed that the rate of H2O2 decomposition, under visible light irradiation and in the dark, obeys the first order kinetic law.While in the dark the H2O2 decomposition rate bymass unit was around 6.88 mmol g−1 s−1, under visible light irradiation theH2O2 decomposition rate achieved a maximal value of 15.13 mmol g−1 s−1. The increase in the H2O2 decomposition, by effect of the visible light, was observed in ranges of catalyst concentrations from 16 to 374 mg L−1. These results reflect the potential of R-MnO2 as a photoactive catalyst, being a consequence of presumed photoreduction of Mn4+centers.
Disciplines :
Chemistry
Chemical engineering
Materials science & engineering
Author, co-author :
Páez Martínez, Carlos ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Liquet, Dimitri ;  Université de Liège - ULiège > Doct. sc. ingé. (chim. appl. - Bologne)
Calberg, Cédric ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Lambert, Stéphanie  ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Willems, Isabelle;  Prayon s.a.
Germeau, Alain;  Prayon s.a.
Pirard, Jean-Paul ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Heinrichs, Benoît ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Nanomatériaux et interfaces
Language :
English
Title :
Study of photocatalytic decomposition of hydrogen peroxide over ramsdellite-MnO2 by O2-pressure monitoring
Publication date :
2011
Journal title :
Catalysis Communications
ISSN :
1566-7367
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
15
Pages :
132-136
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
FRFC - Fonds de la Recherche Fondamentale Collective [BE]
MRW - Ministère de la Région wallonne [BE]
Belgian Interuniversity Attraction Pole INANOMAT (IAP-P6/17)
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