Magnesium-containing catalysts for the decarboxylation of bio-oil

Today one of the most promising methods for processing of renewable raw feed is pyrolysis, which allow to obtain a liquid organic products (bio-oil) from biomass. To produce а biodiesel fuel the preliminary elevation of biomass is necessary. It is advisable to carry out the process in two stages, the first of which, decarboxylation reduces aggressiveness (acidity) of the feed and the consumption of hydrogen in the second stage. A catalysts based on a noble metals usually are used for decarboxylation. There are also examples of the use of cheaper catalysts based on alkaline earth metals oxides but their lack of stability is a significant problem. We have investigated the activity of catalysts based on MgO in the decarboxylation reaction of biodiesel model compound (pentanoic acid) and the effect of modifying additives on the stability of magnesium-containing catalysts. The process was carried out under an inert atmosphere at a temperature of 350 °С and a pressure of 0,50 MPa. It is shown if to increase the MgO calcination temperature up to 1200 °C and to introduce the stabilizing additives (Al2O3, SiO2 and ZrO2) than deactivation is mainly due to the formation of carbonates and insoluble salts of magnesium, due to which these catalysts are more promising in terms of the possibility of regeneration.

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