Vapor-phase hydrolysis of chlorobenzene catalyzed by copper(II) ion-exchanged zirconium phosphate.

概要

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Copper(II) ion-exchanged zirconium phosphate (ZP–Cu(II)) effectively catalyzed the vapor-phase hydrolysis of chlorobenzene to phenol at 450 °C under atmospheric pressure. Per-pass conversion of chlorobenzene was between 12 and 18% with selectivity for phenol from 90 to 95 mol %. The catalytic activity was influenced by the content of copper, the ratio of phosphate to zirconium, and the pH at which copper(II) ions were introduced into zirconium phosphate. ZP–Cu(II) catalyst was amorphous and it turned inactive by thermal treatment at above 800 °C, resulting in a crystalline substance. The active site of ZP–Cu(II) for this hydrolysis reaction appears to be the phosphate groups of ZP bearing copper(II) ion. The reaction seems to proceed <I>via</I> a Rideal mechanism in which an adsorbed chlorobenzene molecule reacts with water in the vapor phase at the catalyst surface. The desorption of hydrogen chloride was rate controlling.
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