Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/52459
Type: Artigo
Title: [M]-CAL-2: MeAPSO-34-like molecular sieves using a lamellar aluminophosphate as precursor
Author: Strauss, Mathias
Martins, Gesley Alex Veloso
Berlier, Gloria
Coluccia, Salvatore
Marchese, Leonardo
Pastore, Heloise O.
Abstract: [M]-CAL-2 (M = Mn, Co and Fe) are metallosilicoaluminophosphates ([M]-APSO) with chabazite-related structure, which are part of the CAL molecular sieves family. They were prepared with a recently developed synthesis based on the use of layered AIPO precursor. The used procedure allowed to obtain high loadings of metal ions and to control the morphology of the crystals. The materials were characterized by structural techniques such as X-ray diffraction, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), thermogravimetry (TGA), and spectroscopic techniques such as UV-Vis and Fourier transformed Infrared (FTIR) with particular attention to the study of their redox functionalities. The results show that [M]-CAL-2 crystals presented rhombohedra morphology and the particles sizes are dependent of the metal concentration in the precursor gel, in addition these particles have a lamellar memory originated from the layered AIPO precursor. The FTIR, UV-Vis and elemental results supported the presence of transition metal ions on the framework of the synthesized materials and allowed to envisage the dependency of the metal and silicon concentrations on a Lowenstein-like ruled substitution mechanism. Finally, the reversible redox behavior of the materials was studied by in situ UV-Vis-NIR spectroscopy. This aspect together with the already shown acidity of CAL samples allowed confirming the acid and redox bifunctionality of the obtained molecular sieves, which can thus be proposed for catalytic applications. (C) 2013 Elsevier Inc. All rights reserved.
[M]-CAL-2 (M = Mn, Co and Fe) are metallosilicoaluminophosphates ([M]-APSO) with chabazite-related structure, which are part of the CAL molecular sieves family. They were prepared with a recently developed synthesis based on the use of layered AlPO precur
Subject: Catalisadores
Aluminofosfatos
Zeolitos
Country: Países Baixos
Editor: Elsevier
Citation: Microporous And Mesoporous Materials. Elsevier Science Bv, v. 187, n. 135, n. 144, 2014.
Rights: fechado
Identifier DOI: 10.1016/j.micromeso.2013.12.020
Address: https://www.sciencedirect.com/science/article/pii/S1387181113006318
Date Issue: 2014
Appears in Collections:IQ - Artigos e Outros Documentos

Files in This Item:
File SizeFormat 
000331674200018.pdf1.6 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.