SILVA, L. B.; http://lattes.cnpq.br/5128526144025421; SILVA, Lilian Barbosa da.
Résumé:
Zeolites belong to the class of aluminosilicates and are technologically Important because
they exhibited remarkable catalytic properties . The Beta zeolite has been highlighted by
presenting open microporous structure that allows the transfer of materials between
intracristalino space and surroundings , plus the high ratio Si / A l , high acidity, thermal and
hydrothermal stability, making it an interesting material for industry chemical and petroleum
as a support for catalysts. The Cobalt and Molybdenum are active and low cost to provide that
support activity when supported on zeolite Beta metals . These metals have been used in the
preparation of catalysts for use in isomerisation and cracking of oil fractions. In this work
were prepared CoMo catalysts supported on zeolite Beta using the methods of physical
dispersion ( A l ) and wet mixture ( B l ) for the incorporation of metal oxides on the support
to evaluate the surface properties of the catalysts . The textural ratings were obtained by
characterization techniques. The analysis of X- ray diffraction indicated that A l impregnation
method was less efficient with respect to crystal Unity, the B l method in which the crystalline
phase was retained. The chemical composition of the catalysts was measured by Energy
Dispersive X-ray ( EDX) , in which the results showed a composition very close to the
nominal composition proposal. The results showed characteristic bands of FTIR for the Beta
zeolite and its acid character is retained for both impregnation methods . HBlCoMo The
catalysts were subjected to thermal analysis by adsorption of pyridine and identification /
quantification of acid sites by FTIR analysis and TG , respectively, and the results showed an
increase in acid sites of the catalyst impregnated by the method B l and the infrared spectra
showed formation of Bransted acid sites in the catalyst impregnated by the method B l . To the
the BET analysis it was observed that after impregnation of the metals to the support by the
methods A l and Bl external surface areas suffered a decrease and the internal surface area
has increased significantly.