Abstract
• The photocatalytic partial conversion of maleic acid in green conditions was studied in the presence of TiO 2 based catalysts. • The effect of pH and addition of two different acids were investigated. • The best selectivity towards succinic acid was 23.2 % at 70 % of maleic acid conversion at pH = 1. • Fumaric acid was also formed as another high added value compound. This study reports the anaerobic reduction of maleic acid to succinic acid in aqueous dispersion of different TiO 2 based photocatalysts. Some home prepared and commercial solids containing different polymorphic phases of TiO 2 and loaded with Pt and Ru were compared at different acidic pHs. The aim of the work was to verify the feasibility of the process and to determine the best samples and the optimal experimental conditions of the reaction. The best selectivity towards succinic acid was 23.2 % at 70 % of maleic acid conversion. Fumaric acid was also formed as another high added value compound, and its quantity was related to the experimental conditions and the photocatalyst used.
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