EDTA-Assisted Impregnation of Zn-Based Catalysts for the Preparation of High-Performance and Low Loss Catalysts in Acetylene Acetoxylation

Impregnation of activated carbon (AC) with Zinc acetate in the presence of ethylene diamine tetraacetic acid (EDTA). Introducing EDTA effectively improves the dispersion of Zn in the catalyst and enhances the adsorption capacity of acetic acid due to the interaction between EDTA and Zn, resulting in an effective increase in the conversion of acetic acid from 50% to 65%. At the same time, as EDTA itself can have a chelating effect with Zn, the introduction can play a certain restraining effect on Zn, thus achieving the effect of inhibiting Zn loss. Even after 180 h of reaction, the Zn loss was very low and the acetate conversion did not decrease at all, and the reason for the inhibition of catalyst deactivation by EDTA was explored. This provides a novel way for developing high-performance and stable catalysts in the acetylation reaction of acetylene.