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Production of 1,3-butadiene in one step catalytic dehydration of 2,3-butanediol
Catalysis Today ( IF 5.3 ) Pub Date : 2018-07-05 , DOI: 10.1016/j.cattod.2018.07.007
N.T.T Nguyen , F. Matei-Rutkovska , M. Huchede , K. Jaillardon , G. Qingyi , C. Michel , J.M.M. Millet

Catalysts able to selectively dehydrate 2,3-butanediol into butadiene have been designed. These catalysts, based on rare-earth orthophosphates showed that 58% selectivity to butadiene could be obtained at total conversion at only 300 °C, and were relatively stable. While the deactivation could be delayed by addition of water to the gas feeds, it could not be avoided and a regeneration was necessary. This regeneration was achieved by a simple heat treatment under air for a few hours at 450 °C. All results showed that Lewis acid sites corresponding to the rare earth cations are involved in the dehydration of 2,3-butanediol into butadiene. This dehydration occurs with the intermediate formation of 3-buten-2ol, probably over acid-base concerted sites and the subsequent dehydration of 3BDOL to butadiene over weak Brønsted acid sites. All types of sites appear present on the catalysts surface and distributed in a relatively optimal way.



中文翻译:

一步催化脱水2,3-丁二醇生产1,3-丁二烯

已经设计了能够选择性地将2,3-丁二醇脱水成丁二烯的催化剂。这些基于稀土正磷酸盐的催化剂显示,仅在300°C的总转化率下,丁二烯的选择性可达58%,并且相对稳定。尽管可以通过向气体进料中加水来延迟失活,但这无法避免,必须进行再生。通过在空气中在450°C下进行简单的几个小时的热处理即可实现这种再生。所有结果表明,对应于稀土阳离子的路易斯酸位点参与了2,3-丁二醇脱水成丁二烯。这种脱水发生在3-丁烯2ol的中间形成过程中,可能在酸碱一致的位点上发生,随后3BDOL在弱的布朗斯台德酸位点上脱水成丁二烯。

更新日期:2018-07-05
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