Aldol condensation of acetic acid with formaldehyde to acrylic acid over SiO2-, SBA-15-, and HZSM-5-supported V-P-O catalysts

摘要

Aldol condensation of acetic acid with formaldehyde to acrylic acid was catalyzed by the SiO2-, SBA-15-, and HZSM-5-supported vanadium phosphorous oxide (V-P-O) catalysts prepared by the incipient wetness impregnation. The supports obviously increased the surface areas and changed the acid-base properties of the as-prepared catalysts. V-P-O/SBA-15 catalysts with high acid and alkali quantities exhibited high catalytic activities for the aldol condensation of acetic acid with formaldehyde to acrylic acid. When the V-P-O/SBA-15 catalyst with the P/V mole ratio of 2.0:1 catalyzed the reaction at 330370 degrees C, the acrylic acid selectivities were 90.8-70.2% at the formaldehyde conversions of 14.3-68.7%. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.