INVESTIGADORES
BOTTA Pablo Martin
artículos
Título:
Occluded cobalt species over ZSM-5 matrix: design, preparation, characterization and magnetic behaviour.
Autor/es:
L.B. PIERELLA; C. SAUX; H.R. BERTORELLO; P.G. BERCOFF; P.M. BOTTA; J. RIVAS
Revista:
MATERIALS RESEARCH BULLETIN
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Año: 2008 p. 2026 - 2035
ISSN:
0025-5408
Resumen:
Co-containing molecular sieves with MFI structure was synthesized by the hydrothermal crystallization method and cobalt was
incorporated in it by wet impregnation at different percentages. Thermal post-treatments were applied to Co-ZSM-5: calcination
and reduction. X ray diffraction (XRD) and FTIR studies confirmed crystallinity, structure and orthorhombic symmetry of the
obtained samples (Co-ZSM-5 calcined and Co-ZSM-5 reduced). The XRD, Raman spectroscopy, SEM and TPR techniques for the
calcined samples showed the presence of Co3O4 which diminished in the reduced samples and Co0 appeared. The magnetic
behavior of the materials was evaluated by magnetization (M) variation with applied magnetic field (H) at different temperatures.
Low magnetization is observed in the calcined samples while high values are attained in the reduced samples, due to the presence of
metallic Co.3O4 which diminished in the reduced samples and Co0 appeared. The magnetic
behavior of the materials was evaluated by magnetization (M) variation with applied magnetic field (H) at different temperatures.
Low magnetization is observed in the calcined samples while high values are attained in the reduced samples, due to the presence of
metallic Co.M) variation with applied magnetic field (H) at different temperatures.
Low magnetization is observed in the calcined samples while high values are attained in the reduced samples, due to the presence of
metallic Co.