2,3-Butanediol dehydration catalyzed by silica-supported alkali phosphates

[Display omitted] •Alkali phosphates are active in 2,3-butanediol dehydration realized via four parallel pathways.•Selectivity to the specific pathway is tuned by the nature of alkali cation and M/P ratio.•Stronger acid-base pairs appear as soon as alkali cations are added to phosphate.•Isolated Brø...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2019-01, Vol.570, p.148-163
Main Authors: Kim, Wooyoung, Shin, Wookyun, Lee, Kyoung Jun, Cho, YongSeok, Kim, Hyung Soon, Filimonov, Igor N.
Format: Article
Language:English
Subjects:
1,3-Butadiene
2,3-Butanediol dehydration
2,3-Epoxy butane
3-Butene-2-ol
Acid-base sites
Acids
Butadiene
Butanediol
Catalysis
Cesium
Deactivation
Dehydration
Elimination/rearrangement
Epoxidation
Methyl ethyl ketone
Phosphates
Phosphoric acid
Polyphosphates
Selectivity
Silica-supported alkali phosphates
Silicon dioxide
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Summary:[Display omitted] •Alkali phosphates are active in 2,3-butanediol dehydration realized via four parallel pathways.•Selectivity to the specific pathway is tuned by the nature of alkali cation and M/P ratio.•Stronger acid-base pairs appear as soon as alkali cations are added to phosphate.•Isolated Brønsted acid centers are responsible for the rearrangement pathway.•Stronger acid-base pairs are responsible for the elimination pathway. Characterization of acid-base centers and catalytic dehydration of 2,3-butanediol (BDO) was performed over a wide range of silica-supported alkali phosphates (M_P/SiO2; M = Na, K, Cs; M:P = 0.5–3 mol:mol). Selectivity to 1,3-butadiene (BD) and 3-butene-2-ol (3B2OL) formed by elimination correlates with the densities of conjugated acid-base pairs and increases in the order Na 
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2018.08.015