| 摘要 |
PURPOSE: Catalysts for the oxychlorination of ethylene to dichloroethane (DCE) capable of providing high conversion rates without sacrificing selectivity by working in a fluid bed at high temperatures are provided, and a process in which the catalysts are used is provided. CONSTITUTION: The catalysts for the oxychlorination of ethylene to 1,2-dichloroethane comprise compounds of Cu and Mg supported on alumina and having a copper content, expressed as Cu, of 2 to 8% by weight, wherein the Mg/Cu atomic ratio is from 1.2 to 2.5, with distribution of the copper atoms more inside the particle of the catalyst than on the surface (layer with a thickness of 20-30 Å) and of the magnesium atoms more on the surface(20-30 Å layer) than inside the particle, and in that the specific surface of the catalyst is from 30 to 130 m¬2/g, and wherein the Mg/Cu ratio is from 1.3 to 2 and the distribution of the copper atoms is such that the X/Y ratio is from 1.2 to 2.7 (X is the Al/Cu ratio at the surface and Y is the Al/Cu ratio within the particle of the catalyst) and the distribution of the magnesium atoms is such that the V/Z ratio is from 1.5 to 3 (V is the Al/Mg ratio within the particle of the catalyst, Z is the Al/Mg ratio at the surface).
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