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Isobutene from Ethanol: Describing the Synergy between In2O3 and m‐ZrO2

The performances of In2O3/ZrO2, ZrO2 and In2O3 were evaluated in the synthesis of isobutene from ethanol in one‐step. These catalysts were characterized by XRD, EPR, TPD‐H2O, TPD‐NH3, TPD‐ethanol and pyridine adsorption. The In2O3/ZrO2 catalyst is a promising catalytic system for the synthesis of is...

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Bibliographic Details
Published in:ChemCatChem 2019-08, Vol.11 (16), p.4011-4020
Main Authors: Zonetti, Priscila C., Bridi, Vivian L., Gonzalez, Guilherme G., Moreira, Carla R., Alves, Odivaldo C., de Avillez, Roberto R., Appel, Lucia G.
Format: Article
Language:English
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Summary:The performances of In2O3/ZrO2, ZrO2 and In2O3 were evaluated in the synthesis of isobutene from ethanol in one‐step. These catalysts were characterized by XRD, EPR, TPD‐H2O, TPD‐NH3, TPD‐ethanol and pyridine adsorption. The In2O3/ZrO2 catalyst is a promising catalytic system for the synthesis of isobutene from ethanol. The catalytic tests showed that acetone, hydrogen and carbon dioxide are the main co‐products of this synthesis. The In2O3/ZrO2 catalyst can promote the synthesis of isobutene due to the inter‐diffusion process between In2O3 and ZrO2. This phenomenon generates, among others, the Zr insertion and a high concentration of anionic vacancies in the In2O3 lattice. This increases the In2O3/ZrO2 redox properties leading to a high activity of this catalyst for the acetone generation, a key intermediate of the isobutene synthesis. These changes also promote the acid and basic properties of In2O3/ZrO2, which are in charge of the acetaldehyde synthesis, acetone condensation and, finally, dehydration of the intermediates of the isobutene synthesis. Redox to the max: The In2O3/ZrO2 catalyst is a promising system for the isobutene synthesis from ethanol due to the inter‐diffusion process between these oxides, which generates a high concentration of anionic vacancies in the In2O3 lattice. This increases the In2O3/ZrO2 redox properties leading to a high activity of this catalyst for the acetone generation, a key intermediate of this synthesis. The In2O3−ZrO2 interaction also promotes the In2O3/ZrO2 acid and basic properties which are in charge of many steps of this cascade reaction.
ISSN:1867-3880
1867-3899
DOI:10.1002/cctc.201900633