Chemical and physical changes related to the deactivation of alumina used in 
catalytic epoxidation with hydrogen peroxide

Rinaldi, Roberto; Fujiwara, Fred Y.; Schuchhardt, Ulf

doi:10.1016/j.jcat.2006.11.011

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Chemical and physical changes related to the deactivation of alumina used in catalytic epoxidation with hydrogen peroxide

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Rinaldi, Roberto
Research Group Rinaldi, Max-Planck-Institut für Kohlenforschung, Max Planck Society;
Instituto de Química, Universidade Estadual de Campinas, PO Box 6154, 13083-970 Campinas, SP, Brazil;

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Citation

Rinaldi, R., Fujiwara, F. Y., & Schuchhardt, U. (2007). Chemical and physical changes related to the deactivation of alumina used in catalytic epoxidation with hydrogen peroxide. Journal of Catalysis, 245(2), 456-465. doi:10.1016/j.jcat.2006.11.011.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-21AC-C

Abstract

This report addresses several questions regarding the deactivation of alumina in catalytic epoxidation using aqueous 70% H₂O₂. The structural, textural, morphological, and chemical changes of a polycrystalline alumina (γ-Al₂O₃ and boehmite) were studied in five consecutives reactions of 24 h. The chemical and physical processes involved in the transformations during alumina recycling are attributed mainly to the presence of water in the reaction mixture. Water plays a dual role in the catalytic system. On the one hand, water may cause deleterious changes of the structure of γ-Al₂O₃ and its textural properties. On the other hand, the presence of water shifts the adsorption equilibria of the organic molecules (acetic acid, diols, and oligomers), preserving the type Ia AlOH sites, which are active for catalytic epoxidation. In this way, the water in the alumina/H₂O₂ catalytic system seems to be significant in prolonging the lifetime of the catalyst.