丁烷-2,3-二醇在Nb2O5.nH2O上脱水的动力学模拟

IF 2.1 4区 化学 Q3 CHEMISTRY, PHYSICAL Progress in Reaction Kinetics and Mechanism Pub Date : 2019-04-10 DOI:10.1177/1468678319825686
Guilin Cheng, Lin-yan Wang, Chengjun Jiang
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引用次数: 2

摘要

本研究采用Nb2O5。用nH2O脱水丁烷-2,3-二醇,丁烷-2,3-二醇可以通过发酵过程从生物质或废气中提取。实验温度范围为220°C ~ 260°C,失重时空速为0.01 ~ 0.05 min−1。主要有三种产品,包括甲基乙基酮、异丁醛和丁二烯。产物收率随反应温度的升高而升高。脱水反应的速率数据可以用Langmuir-Hinshelwood动力学和速率方程中的吸附参数很好地表示,该动力学假设产物的形成在单位点反应中是可逆的。Arrhenius图数据表明,甲基乙基酮、异丁醛和丁二烯脱水反应的表观活化能分别为19.5、24.0和23.7 kJ mol−1。对丁烷-2,3-二醇、甲基乙基酮、异丁醛和丁二烯的吸附能分别为−182.4、−142.1、−136.1和−105.6 kJ mol−1。
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Kinetic modeling of butane-2,3-diol dehydration over Nb2O5.nH2O
This study employed Nb2O5.nH2O for the dehydration of butane-2,3-diol, which could be derived from biomass or waste gas using a fermentation process. The experiments were conducted at a temperature ranging from 220 °C to 260 °C and a weight hourly space velocity of 0.01–0.05 min−1. There are three main products that include methyl ethyl ketone, isobutyraldehyde, and butadiene. The yield of products increased with the reaction temperature. Rate data for the dehydration reaction were well represented by Langmuir–Hinshelwood kinetics with adsorption parameters in the rate equations, which assumed the formation of products was reversible with single-site reaction. The apparent activation energies for the dehydration reaction of methyl ethyl ketone, isobutyraldehyde, and butadiene obtained from the Arrhenius plot data were 19.5, 24.0, and 23.7 kJ mol−1, respectively. The adsorption energies for butane-2,3-diol, methyl ethyl ketone, isobutyraldehyde, and butadiene were −182.4, −142.1, −136.1, and −105.6 kJ mol−1, respectively.
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来源期刊
CiteScore
2.10
自引率
0.00%
发文量
5
审稿时长
2.3 months
期刊介绍: The journal covers the fields of kinetics and mechanisms of chemical processes in the gas phase and solution of both simple and complex systems.
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