Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/699
Título: Modification of MOR by desilication treatments: Structural, textural and acidic characterization
Autor: Paixão, Viviana
Carvalho, Ana P.
Rocha, João
Fernandes, Auguste
Martins, Angela
Palavras-chave: Mesoporous mordenite
Desilication
FTIR
Al-27 and Si-29 MAS-NMR
Acidity
Data: Jun-2010
Editora: Elsevier Science BV
Citação: Paixão V, Carvalho A P, Rocha J, Fernandes A, Martins A.Modification of MOR by desilication treatments: Structural, textural and acidic characterization. Microporous and Mesoporous Materials. 2010; 131 (1-3): 350-357.
Relatório da Série N.º: 1-3;
Resumo: The effect of several desilication experimental parameters (base concentration, temperature and time) on the characteristics of MOR zeolite was studied. The samples were characterized by X-ray diffraction, Al-27 and Si-29 MAS-NMR, chemical analysis, and FTIR (framework vibration region). The textural characterization was made by N-2 adsorption and the acidity was evaluated by pyridine adsorption followed by FTIR and by the catalytic model reaction of n-heptane cracking. The alkaline treatments promoted the Si extraction from the zeolite framework, without considerable loss of crystallinity and, as it was envisaged, an important increase of the mesoporous structure was attained. A linear correlation between the number of framework Si per unit cell. N-Si and the asymmetric stretching wavenumber, nu(i), was observed. The acidity characterization shows that the desilicated samples exhibit practically the same acid properties than the parent HMOR zeolite. The optimum desilication conditions were those used to obtain sample M/0.2/85/2, i.e., sample treated with 0.2 M NaOH solution at 85 degrees C for 2 h.
Peer review: yes
URI: http://hdl.handle.net/10400.21/699
ISSN: 1387-1811
Aparece nas colecções:ISEL - Eng. Elect. Tel. Comp. - Artigos

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