Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2115
Título: Catalytic combustion of toluene on Pt zeolite coated cordierite foams
Autor: Ribeiro, Filipa
Silva, João M.
Silva, Elisabete
Vaz, M. Fátima
Oliveira, Fernando A. C.
Palavras-chave: Cordierite foam
Zeolite washcoating
Toluene combustion
Pt
MFI
Volatile organic-compounds
Compounds vocs
Environmental applications
Oxidation
Reactors
Xylene
Data: 1-Nov-2011
Editora: Elsevier Science BV
Citação: RIBEIRO, Filipa; SILVA, João M.; SILVA, Elisabete; VAZ, M. Fátima; OLIVEIRA, Fernando A. C. - Catalytic combustion of toluene on Pt zeolite coated cordierite foams. Catalysis Today. ISSN 0920-5861. Vol. 176, n.º 1 (2011) p. 93-96.
Resumo: The catalytic properties of Pt based cordierite foam catalysts have been evaluated in catalytic combustion of toluene (800 ppm in air). The catalysts contain identical Pt content (0.1%) which was introduced by three different ways: Pt ion exchange on MFI zeolite and then coating on the foam; Pt ion exchange after zeolite coating and finally Pt directly wet impregnated on the cordierite foam. The catalytic behaviour of Pt foam based catalysts was compared with that of PtMFI zeolite under powder form. Pt exchanged MFI supported on the cordierite foams present an improvement of activity for toluene combustion of about 50 degrees C on the light off temperature (T-50%). The enhanced performance of the structured catalysts is due not only to the open structure of foams and homogeneous thin layers catalyst deposited on their cell walls, but also to the fact that the size and location of Pt particles present in MFI zeolite are changed during the dipping step. Indeed, as prepared Pt samples and those used in the preparation of the slurry were observed by transmission electron microscopy revealing that the chemical interaction of PtMFI zeolite with the binder and detergent, both present in the slurry, leads to an increase of Pt particles size which were found to migrate from internal pores to the external surface of zeolite crystallites thereby increasing catalytic activity. (C) 2011 Elsevier B.V. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2115
ISSN: 0920-5861
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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