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Selective dehydration of 2,3-butanediol to 3-buten-2-ol over ZrO2 modified with CaO

Paper ID Volume ID Publish Year Pages File Format Full-Text
39482 45824 2014 8 PDF Available
Title
Selective dehydration of 2,3-butanediol to 3-buten-2-ol over ZrO2 modified with CaO
Abstract

•Vapor-phase catalytic dehydration of 2,3-butanediol was investigated.•3-Buten-2-ol was preferentially produced over CaO/ZrO2 catalysts.•The catalytic active sites were poisoned by both CO2 and NH3 gases over the catalyst.•The formation of 3B2OL from 2,3-BDO proceeds over base–acid concerted sites.•The highest selectivity to 3-buten-2-ol exceeds 76% at 350 °C.

Vapor-phase catalytic dehydration of 2,3-butanediol (2,3-BDO) was investigated over several metal oxides loaded on well-crystallized monoclinic ZrO2. In the dehydration of 2,3-BDO, unsaturated alcohol, i.e. 3-buten-2-ol (3B2OL), was preferentially produced together with major by-products such as butanone and 3-hydroxy-2-butanone over ZrO2-based catalysts. The selectivity to 3B2OL over monoclinic ZrO2 was greatly enhanced by the alkaline-earth oxides such as CaO, SrO, and BaO. At a CaO loading of 3 wt% on the monoclinic ZrO2, a Ca-O-Zr hetero-linkage was formed to generate new basic sites, and the selectivity to 3B2OL exceeded 76% at 350 °C. Poisoning experiments using CO2 and NH3 strongly suggest that the formation of 3B2OL from 2,3-BDO proceeds over base–acid concerted sites.

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Keywords
Unsaturated alcohol; 3-Buten-2-ol; 2,3-Butanediol; Dehydration; Monoclinic ZrO2; Supported alkaline-earth oxides; Base–acid concerted sites
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Selective dehydration of 2,3-butanediol to 3-buten-2-ol over ZrO2 modified with CaO
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 487, October 2014, Pages 226–233
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
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