COMPARAÇÃO DE CATALISADORES (VD E MoO3/VD) NA TRANSESTERIFICAÇÃO DO ÓLEO DE SOJA PARA PRODUÇÃO DE BIODIESEL

Abstract

O trabalho teve como objetivo produzir catalisadores heterogêneos a base de argila verde dura natural (VD) e impregnação do óxido de molibidênio. Estes catalisadores foram avaliados na reação de transesterificação do óleo de soja com metanol para produzir biodiesel. Foram avaliados os efeitos do tempo de reação (1, 2, 3, 4, 5 e 6 h) e catalisador (VD e MoO3/VD) sobre a viscosidade cinemática do biodiesel. Os catalisadores (VD e MoO3/VD) foram caracterizados por DRX, FRX-ED, Adsorção física de N2, MEV, IV e TPD. A reação de transesterificação do óleo de soja foi conduzida em reator batelada sem agitação, durante tempos diferentes de reação (1, 2, 3, 4 e 6 horas) a 200 °C, utilizando uma relação óleo de soja/metanol de 1:12 e 5 % de catalisador. O produto obtido foi caracterizado a partir da viscosidade cinemática. Foi observado com o catalisador VD que os valores estão muito distantes aos padrões estabelecidos pela Agência Nacional de Petróleo, Gás Natural e Biocombustíveis (ANP), n° 4 de 2012. Enquanto que os valores de viscosidade com o catalisador MoO3/VD com os tempos de 5 e 6 horas de reação se aproximaram aos padrões estabelecidos pela ANP. Nesse sentido, a inserção do molibdênio na argila verde dura natural proporcionou um efeito positivo ao catalisador.

Organic Structure-Directing Agent Free Synthesis of Mordenite with Seeds, Used as A Support for Mo Catalysts in the Transesterification of Soybean Oil

“…The desired MoO 3 content in the final catalyst were 8 wt%. In a synthesis, 1.0 g of mordenite zeolite was impregnated with an aqueous solution of the molybdenum precursor [40][41][42]. After impregnation, the material was dried in an oven at 80°C for 4 h. Material was calcined in a muffle furnace from room temperature up to 550°C, using a 5°C/min heating ramp remaining at the final temperature (550°C) for 4 h.…”

“…Two phases were observed: the methyl ester and the glycerin. The biodiesel samples were submitted to a washing process to purify the esters with distilled water, then centrifuged at 600 RPM for 30 minutes and dried at 100°C [40][41][42][46][47][48].…”

Synthesis of MoO 3 by pilot‐scale combustion reaction and evaluation in biodiesel production from residual oil

“…Among the solid catalysts studied, molybdenum trioxide and materials based on the transition metal Mo, have been the focus of several technological applications, mainly due to their structural characteristics, as photocatalysts, 9,13 gas sensors, 14 battery applications, 5,15,16 and for biodiesel production 10,12,17,18 . Also, their selectivity and high catalytic activity are primarily related to Lewis and Brønsted‐Lowry acidity 19‐21 …”

“…10,12,17,18 Also, their selectivity and high catalytic activity are primarily related to Lewis and Brønsted-Lowry acidity. [19][20][21] In biodiesel production, heterogeneous catalysts based on molybdenum trioxide are expected to meet the premises of economics and environmental benefits, as already mentioned. 10,17 Studies reporting MoO 3 -or Mobased compounds as catalysts in the production of biodiesel are scarce in the literature; in general, they are used as active phase supported in other materials, for example, W x -Mo y /CaO, CaO-MoO 3 /SBA-15, 16 MoO 3 /B-ZSM-5, 18 and MoPO/Y-Al 2 O 3.…”