NANOSTRUCTURED TITANIA CATALYST WITH STABILIZED ACIDITY AND PROCESS THEREOF.

摘要

The present invention is related to the process for obtaining a nanostructured titania catalyst with stabilized acidity, called TNT-IMP; through the sol-gel method and hydrotreatment and thermal activation; constituted basically by titanium oxide, specially characterized of being as nanostructures in its evolution nanocrystals-nanotubes-nanocrystals, that gives special physicochemical properties such as: high specific area, purity and phases stability, acidity stability and different types of active acid sites, such as a capacity to disperse and stabilize metallic particles with high activity mainly in catalytic processes. The process for obtaining the nanostructured titania catalyst with stabilized acidity, called TNT-IMP that consists on providing a process for obtaining a nanostructured titania catalyst where the dimension of the nanostructure crystal size of the nanocrystals-nanotubes-nanocrystals nanostructures of the titania catalyst depend on the particular handling or joint of the variables of the sol-gel and hydrothermal methods, referring to the sol-gel method, such as; the types of titania metal alkoxides used, the characteristics of the solvents, the relation alkoxide/water and the media in which the hydrolysis is carried out, that can be acid or basic in the hydrothermal process, the variables such as: concentration of an alkaline base, temperature, aging time and washing conditions and finally the thermal treatment of activation of catalysts. The process for obtaining the nanostructure titania catalyst with stabilized acidity, called TNT-IMP where the dryings steps at ranges of 70 to 80 DEG C, in periods of time of 4 to 12 hours and the calcination step in a range of 300 to 600 DEG C, in a period of time of 3 to 9 hours, determine the evolution of nanocrystals-nanotubes-nanocrystals structures with special physicochemical properties, giving special characteristics to the TNT-IMP catalyst, such as the capacity to disperse and stabilize active metal pa rticles with high activity and selectivity mainly in catalytic processes. A TNT-IMP nanostructured titania catalyst with a high acidity grade and different types of acid sites (Lewis/Brönsted), stabilized at high temperature and with resistance to deactivation by temperature, which gives the catalyst a specific acidity for catalytic processes.