CONICET | Buscador de Institutos y Recursos Humanos

The main objective of the present work is to study the feasibility of supporting catalysts based on boron-nickel, already developed in previous works, and also to evaluate its catalytic aptitude for a potential use in industrial processes. In a first stage the study was centered in the selection of capable materials to be supported, their consequent characterization and adaptation to the reacting system. Commercial supports as silica gel, alumina and modified materials obtained from expanded Perlite were used. The Perlite is an abundant natural silicoaluminate in the Norwest region of Argentine. It is modified to obtain Rehydroxilated Perlite through hydrothermal treatments, carried out in vapor phase at different temperatures and self-generated pressure. The process to obtain zeolite is carried out in liquid phase with alkaline solutions of NaCl, with variable contents of Al. The better conditions are discussed for the process of superficial corrosion that leads to Rehydroxilated Perlite and with same approach for the bulk modification until obtaining a type of appropriate zeolite adjusting the relationship Si/Al. The physical-chemical characterization of these materials and the determinations of the presence of the species on the surface were carried out using BET, FTIR and DRX. The preparation of the catalysts was carried out following a procedure previously developed in order to obtain the same active species that in the case of the massive (bulk) catalyst. The influence of operative parameters during the impregnation process like order of reactants, speed of agitation, time of aging and it influences from the previous thermal treatment were evaluated. The results point out that the capable materials correspond to commercial silica and Rehydroxilated Perlite. This property could be assigned to the existence of superficial groups OH which allow the anchorage of the nickel boride catalyst.

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