Síntese da CTA-MCM-41 a partir de trissilicato de sódio e avaliação na transesterificação de ésteres
Barbosa, Juliana Pereira
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The increasing demand for it in today s world and the problems caused by fossil fuel usage lead to a search for alternative sources that may integrate the world s energy matrix. In this context, because this product is essential to technological, social and environmental development of a country, biofuels like ethanol and biodiesel are strong candidates to minimize the worries about energy availability. Biodiesel is often produced by transesterification reaction using homogeneous catalyst as sodium hydroxide (NaOH) or potassium hydroxide (KOH). However, these materials present issues like the soap formation and need for additional steps in the process to neutralize and purify the product in order to be under specification of Brazilian National Agency of Petroleum, Natural Gas and Biofuels. This fact has stimulated research to find new materials to replace the current route of biofuels production and one promising material is the heterogeneous catalyst. With this motivation, this work presents a new alternative to the synthesis of a solid recently classified as heterogeneous catalyst, the MCM-41, aiming the minimization of costs for its production. The material was synthesized using sodium trisilicate as silica source and it was later tested, without modification, in transesterification reaction between an ester and an alcohol. The results showed catalyst activity and the conversion was around 40%, but its reuse reveals intense loss of activity because of CTA+ cations removal. However, new techniques are under development to guarantee more stability to the catalyst.