Síntese e aplicação de zeólitas à partir do resíduo da produção de caulim visando o tratamento de biocombustíveis

Abstract

The present work aimed to use the kaolin residue from industries installed in Pará and the residual silicon oxide (OSR), reused from the coating of industrial ovens, as sources of silicon and aluminum, in the synthesis of zeolites. The study aims to apply the products in the treatment of biofuels from the catalytic thermal cracking of biomass. As for the synthesis methodology, the hydrothermal method (aluminum silicate hydrogel) was applied with crystallization from kaolin thermally activated at 700 ° C for 2 hours (metakaolinite). The results obtained by the characterization of the synthesized zeolitic materials, show that in the process developed with the metakaolinite submitted to the hydrothermal reaction in alkaline medium (NaOH 3.5 M) at 110oC for 12 hours, with the OSR as an additional source of silica, it was obtained the zeolite of the NaP2 type, with the incidence of quartz remaining from the reaction. This, in turn, ended up not reacting completely in the aforementioned process parameters. In the synthesis performed also with a time of 12 hours, however, using a temperature of 125oC, in addition to the absence of rest in a static autoclave, there was the formation of faujasite zeolite NaY, as the predominant phase in the product, presenting good crystallinity. This second method indicated that for higher temperatures, there is a better dissolution of quartz in zeolitic crystallization. The simplified test of the adsorptive potential of the faujasite synthesized material NaY, carried out on Biokerosene obtained by cracking bovine tallow with sodium carbonate (Na2CO3) as a catalyst, culminated in a considerable reduction in its acidity of 5,101 mgKOH / g 2,504 mgKOH / g evidencing the applicability of this material in the studied route.