Abstract
Metal–organic frameworks (MOFs)-derived materials with a large specific surface area and rich pore structures are favorable for catalytic performance. In this work, MOFs are successfully prepared. Through pyrolysis of MOFs under nitrogen gas, zinc-based catalysts with different active sites for acetylene acetoxylation are obtained. The influence of the oxygen atom, nitrogen atom, and coexistence of oxygen and nitrogen atoms on the structure and catalytic performance of MOFs-derived catalysts was investigated. According to the results, the catalysts with different catalytic activity are Zn-O-C (33%), Zn-O/N-C (27%), and Zn-N-C (12%). From the measurements of X-ray photoelectron spectroscopy (XPS), it can be confirmed that the formation of different active sites affects the electron cloud density of zinc. The electron cloud density of zinc affects the ability to attract CH3COOH, which makes catalysts different in terms of catalytic activity.
Highlights
Shen, G.; Wang, X.; Dai, B.Vinyl acetate (VAc) is a significant chemical raw material globally, which is a colorless and flammable liquid with a sweet ether taste
VAc is mainly used to produce polyvinyl acetate (PVAc), polyvinyl alcohol (PVA), vinyl acetate-ethylene copolymer emulsion (VAE), ethylene-vinyl acetate resin (EVA), and other necessary downstream chemical raw materials, and it has been widely used in coatings, adhesives, vinylon, and other fields [1,2,3]
After continuous exploration and research by predecessors, it is found that the catalyst prepared with zinc as the active component and activated carbon as the carrier shows better catalytic performance in the production of vinyl acetate by the acetylene method [7,8,9]
Summary
Vinyl acetate (VAc) is a significant chemical raw material globally, which is a colorless and flammable liquid with a sweet ether taste. VAc is mainly used to produce polyvinyl acetate (PVAc), polyvinyl alcohol (PVA), vinyl acetate-ethylene copolymer emulsion (VAE), ethylene-vinyl acetate resin (EVA), and other necessary downstream chemical raw materials, and it has been widely used in coatings, adhesives, vinylon, and other fields [1,2,3]. Vinyl acetate is manufactured from petroleum ethylene and calcium carbide acetylene [4]. Given the fact that China features a coal-rich, oil-poor, and low-gas energy structure [5,6], calcium carbide acetylene is the primary source to produce vinyl acetate. After continuous exploration and research by predecessors, it is found that the catalyst prepared with zinc as the active component and activated carbon as the carrier shows better catalytic performance in the production of vinyl acetate by the acetylene method [7,8,9]
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