Abstract
The relative contents of Cu+ and Cu2+ in solutions of anhydrous Nieuwland catalyst and CuCl2-added anhydrous Nieuwland catalyst were detected by X-ray photoelectron spectroscopy (XPS). Results indicated that Cu+ could be transformed into Cu2+ during the process of acetylene dimerization into monovinylacetylene, leading to deactivation of the catalyst. Moreover, the addition of Cu2+ inhibited the oxidation of Cu+ into Cu2+ and enhanced the performance and lifetime of the catalyst. The optimum molar ratio of Cu+ to Cu2+ was approximately 2:1; at this ratio, up to 40% acetylene conversion may be achieved.
Highlights
Results indicated thatratioDimerization into monovinylacetylene, leading to deactivation of the catalyst
Monovinylacetylene (MVA), an acetylene downstream product, is extensively used to synthesize
Cu could be used as a co‐catalyst to enhance catalytic the concentration of Cu or Cu resulted in lower acetylene conversion rates, which indicated that an Increasing concentration ofwas
Summary
Dimerization into monovinylacetylene, leading to deactivation of the catalyst. Addition of Cu inhibited the oxidation of Cu into Cu and enhanced the performance and lifetime of the catalyst. The optimum molar ratio of Cu+ to Cu2+ was approximately 2:1; at this ratio, up to Keywords: monovinylacetylene; acetylene dimerization; anhydrous Nieuwland catalyst; Cu+ -Cu2+.
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