Síntese da zeólita SSZ-13 por rotas econômicas empregando sementes e diferentes agentes direcionadores de estrutura

Abstract

In this work, the analysis of zeolite SSZ-13 was evaluated with the combined use of crystallization seeds and with alternatives structure directing agents (SDA) hexamethylenetetramine (HTMA), 1- (cis-3-chloroalyl) - 3,5,7-triazo-1- azoniaadamantane chloride (CTA) and the 5-ethyl-1-azo-3,7- dioxabicyclo[3.3.0]octane chloride (CEDO). The results show that there is no formation of SSZ-13 for directing agent free synthesis even with the presence of crystallization seeds, for the conditions studied there was formation of the zeolite P. Among the selected directing agent, for hexamethylenetetramine, due to its lower cost, different synthesis routes were evaluated. For the experiments carried out without the addition of seeds and with HTMA the results indicated the formation of zeolite P in all studied crystallization times. However, the use of seeds combined with HTMA was effective for the desired zeolitic structure 24 hours of crystallization, after that time, the analyzes indicated the formation of the SSZ-13 phase simultaneously with the zeolite P. For the CEDO and CTA directing agents, only syntheses combined with the use of crystallization seeds were performed. The results using CEDO indicated the formation of SSZ-13 up to 12 hours of crystallization, after that there was the simultaneous formation of zeolite P. With the directing agent CTA, SSZ-13 was formed in 8 hours of crystallization, however from 12 hours, the sample is amorphized.