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The influence of the support nature on physicochemical characteristics (surface acidity, porous structure) of complex oxide compositions B-P-V-W-Ox and their catalytic properties (activity, selectivity) in the reaction of gas-phase aldol condensation of acetic acid with formaldehyde to obtain acrylic acid was studied. It was found that the activity of catalysts varies symbolically with the size of the specific surface, and the selectivity of the formation of acrylic acid is determined by the presence of weak acid centers on the surface of the catalyst. In the presence of the catalyst B-P-V-W-Ox/TiO2 at a temperature of 375°C, acrylic acid was obtained with a yield of ~59% with a selectivity of formation of 92%. [ABSTRACT FROM AUTHOR]