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The potential of ZrO2 catalysts for the dehydration of 2,3-butanediol into 3-buten-2-ol: Impact of synthesis method and operating conditions
Journal of Catalysis ( IF 7.3 ) Pub Date : 2022-05-18 , DOI: 10.1016/j.jcat.2022.05.011
Beruk A. Bekele , Jeroen Poissonnier , Joris W. Thybaut

2,3-Butanediol (2,3-BDO) dehydration towards 1,3-butadiene was investigated over commercial and in-house synthesized ZrO2 catalysts in a Berty reactor at intrinsic kinetics conditions. The commercial and ZrO2 catalysts prepared via precipitation (ZrO2-PP) exhibited a higher selectivity towards the undesired methyl ethyl ketone which was attributed to a lack of sufficient acid-base concerted active sites. For ZrO2-PP, this was attributed to its tetragonal crystal structure with weaker adsorption sites. Hydrothermal synthesis allowed producing ZrO2 with a monoclinic crystal structure, with correspondingly more pronounced acidic and basic properties which could be further tuned via calcination. A maximal 3-buten-2-ol, i.e., the desired intermediate for further conversion into 1,3-butadiene, yield amounting to 38% (mol mol−1) could be obtained under a N2 flow at 300 °C, a space time of 1130 kg s mol−1 and 2,3-BDO partial pressure of 0.16 bar over the hydrothermally synthesized catalyst.



中文翻译:

ZrO2 催化剂在 2,3-丁二醇脱水成 3-buten-2-ol 中的潜力:合成方法和操作条件的影响

通过商业和内部合成的 ZrO 2催化剂在 Berty 反应器中在固有动力学条件下研究 2,3-丁二醇 (2,3-BDO) 脱水生成 1,3-丁二烯。通过沉淀制备的商业和 ZrO 2催化剂 (ZrO 2 -PP) 对不需要的甲基乙基酮表现出更高的选择性,这归因于缺乏足够的酸碱协同活性位点。对于ZrO 2 -PP,这归因于其具有较弱吸附位点的四方晶体结构。水热合成允许生产 ZrO 2具有单斜晶体结构,具有相应更明显的酸性和碱性特性,可以通过煅烧进一步调整。在 300 °C的 N 2流下,可以得到最大的 3-buten-2-ol,即进一步转化为 1,3-丁二烯的所需中间体,产率为 38% (mol mol -1 ),a水热合成催化剂上的时空为 1130 kg s mol -1和 0.16 bar 的 2,3-BDO 分压。

更新日期:2022-05-18
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