ORBi: Páez Martínez Carlos - Study of photocatalytic decomposition of hydrogen peroxide over ramsdellite-MnO2 by O2-pressure monitoring

Reference : Study of photocatalytic decomposition of hydrogen peroxide over ramsdellite-MnO2 by O2-p...


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Chemistry Engineering, computing & technology : Materials science & engineering Engineering, computing & technology : Chemical engineering
	To cite this reference:	http://hdl.handle.net/2268/112093

Title :	Study of photocatalytic decomposition of hydrogen peroxide over ramsdellite-MnO2 by O2-pressure monitoring
Language :	English
Author, co-author :	Páez Martínez, Carlos [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Liquet, Dimitri [Université de Liège - ULg > > > Doct. sc. ingé. (chim. appl. - Bologne)]
	Calberg, Cédric [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Lambert, Stéphanie [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Willems, Isabelle [Prayon s.a. > > > >]
	Germeau, Alain [Prayon s.a. > > > >]
	Pirard, Jean-Paul [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Heinrichs, Benoît [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Nanomatériaux et interfaces >]
Publication date :	2011
Journal title :	Catalysis Communications
Publisher :	Elsevier Science
Volume :	15
Pages :	132-136
Peer reviewed :	Yes (verified by ORBi)
Audience :	International
ISSN :	1566-7367
City :	Amsterdam
Country :	The Netherlands
Keywords :	[en] 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.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Fonds de la Recherche Fondamentale Collective - FRFC ; Ministère de la Région Wallonne ; Belgian Interuniversity Attraction Pole INANOMAT (IAP-P6/17)
Permalink :	http://hdl.handle.net/2268/112093
DOI :	10.1016/j.catcom.2011.08.025

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