Abstract

Examples of acid-base bifunctional catalysis by ZrO 2 and its mixed oxides are summarized. The hydrogenation of olefins, carbon monoxide and aromatic carboxylic acids over ZrO 2 are also examples of acid-base bifunctional catalysis which occur by heterolytic splitting of a hydrogen molecule (H 2) into a proton (H +) and a hydride ion (H −) on the acid-base pair sites. Industrial applications of ZrO 2 catalysts are demonstrated, the importance of acid-base bifunctional catalysis by ZrO 2 and its mixed oxides being emphasized.

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