A Novel High-Activity Zn-Co Catalyst for Acetylene Acetoxylation

Peijie He,Mingyuan Zhu,Liuhua Huang,Xueyi Wu,Bin Dai,Zhuang Xu,Xugen Wang

doi:10.3390/catal8060239

Peijie He, Mingyuan Zhu + Show 5 more

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https://doi.org/10.3390/catal8060239

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Abstract

In this paper, Zn(OAc)2/AC and Zn-Co/AC catalysts were prepared and applied in an acetylene acetoxylation reaction. Compared with monometallic Zn(OAc)2/AC catalyst, which is widely applied in industry, the Zn-Co catalysts exhibited excellent catalytic performance. Transmission electron microscopy results displayed that the addition of cobalt improved the dispersity of zinc acetate particles and inhibited catalyst sintering on the catalyst surface. X-ray photoelectron spectra suggested that the Co additive changed the electron density of zinc acetate probably because of the interaction between Zn and Co species. Temperature programmed desorption analysis demonstrated Co additive strengthened the adsorption of acetic acid and weakened the adsorption of acetylene.

Highlights

Vinyl acetate monomer (VAM) production is one of the 50 largest among chemical raw materials in the world, mainly used in the production of polyvinyl acetate, polyvinyl alcohol, acetal resin, etc. [1,2,3]
The acetylene method is characterized by the reaction of C2 H2 with HAc via an acetylene acetoxylation reaction [4]: C2 H2 + CH3 COOH
For acetylene acetoxylation has a number of shortcomings, such as poor mechanical strength, quickly decreasing activity, low production capacity, short catalyst life, and so on

Summary

Introduction

Vinyl acetate monomer (VAM) production is one of the 50 largest among chemical raw materials in the world, mainly used in the production of polyvinyl acetate, polyvinyl alcohol, acetal resin, etc. [1,2,3]. The ethylene method and the acetylene method are the two routes used in the synthesis of vinyl acetate in industry [4,5].The reaction equation of the ethylene method is [5]: C2 H4 + CH3 COOH + 0.5O2 Pd/Au. The acetylene method is characterized by the reaction of C2 H2 with HAc via an acetylene acetoxylation reaction [4]: C2 H2 + CH3 COOH Zn/AC → CH2 CHCOOCH3 (2). For acetylene acetoxylation has a number of shortcomings, such as poor mechanical strength, quickly decreasing activity, low production capacity, short catalyst life, and so on. In order to realize high efficiency production of vinyl acetate, it is very necessary to develop a new catalyst with high activity, high strength and a long life.

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