Applied Catalysis A: General p. 148 - 163 (2019)
Update date:2022-08-18
Topics:
Kim, Wooyoung
Shin, Wookyun
Lee, Kyoung Jun
Cho, YongSeok
Kim, Hyung Soon
Filimonov, Igor N.
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 < K ≈ Cs. Selectivity to 2,3-epoxybutane (BTO) formed by dehydrative epoxidation increases with the M/P ratio in the order Na < K ≤ Cs. Methyl ethyl ketone (MEK) and isobutyraldyde (IBA) formed by the rearrangement are produced by isolated Br?nsted acid centers. Conjugated acid-base pairs are probably composed of the end groups of polyphosphates having both acid P-OH and base P–O??M+ moieties. Isolated Br?nsted acid centers are probably silica grafted phosphoric acid molecules at low M/P and –PO(OH)2 end groups of oligophosphates at M/P > 1.5. Deactivation rate increases with the increase of M/P ratio in order Na < K < Cs. Deactivation patterns imply that sites responsible for elimination are active in dehydrative epoxidation. Dehydration of 3B2OL smoothly proceeds to BD, but the catalysts deactivate faster compared to BDO dehydration.
View MoreContact:+86-371-67759225
Address:No.32, Jinsuo Road, High-tech Zone
SHANXI JINJIN CHEMICAL INDUSTRIAL CO.,LTD
website:http://www.jinjingroup.com
Contact:4009982989
Address:Economic And Technological Development Zone,Hejin?City,Shanxi Province?,China
Shenzhen Sunrising Industry Co., ltd.
Contact:+86 755 86571158 / 86571159 / 86571160
Address:2108 ZHENYE INT. BUSINESS CENTER,NO.3101-90 QIANHAI RD, NANSHAN,SHENZHEN, CHINA
website:http://www.chemdow.com
Contact:0086-10-82435335
Address:Room 401,Unit 3,4th Floor,Shangdijiayuan,Shangdi East Road, Haidian District,Beijing
Contact:+86 21 34123252
Address:14, 4580 Dushi, Shanghai, China
Doi:10.1016/j.ejmech.2017.01.016
(2017)Doi:10.1002/hlca.19410240134
(1941)Doi:10.1016/j.tetlet.2004.03.117
(2004)Doi:10.1016/j.ultsonch.2013.01.018
(2013)Doi:10.1016/j.molstruc.2020.127774
(2020)Doi:10.1007/BF00566191
()