利用热重-傅里叶变换红外光谱技术研究了大型藻浒苔在CO2气氛下的热解气化过程

IF 2.1 4区 化学 Q3 CHEMISTRY, PHYSICAL Progress in Reaction Kinetics and Mechanism Pub Date : 2019-04-24 DOI:10.1177/1468678319825735
Junrui Cao, Yuhui Ma
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引用次数: 8

摘要

采用热重分析法研究了浒苔(Enteromorpha prolifera)在CO2气氛下的非等温热解和气化过程。采用傅里叶变换红外光谱法和热重法对产物进行了在线测量。采用Coats-Redfern法获得了热解和气化反应的动力学参数。实验结果表明,浒颖在240°C和800°C处有两个导数热重峰,分别表示有机物的热解和焦炭的气化。羧酸、醚和醇是230 ~ 300℃热解过程中主要的可凝产物。在此温度范围内还形成了H2O、CH4和脂肪烃,并在更高温度下不断释放,表明新生成的热解炭进一步聚合。CO主要在700 ~ 900℃之间生成,其产率远高于热解气态产物。Ginstling方程(D4模型)是热解和气化阶段最可能的机理函数,其活化能分别为138.30和93.43 kJ mol−1。
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Pyrolysis and gasification of macroalgae Enteromorpha prolifera under a CO2 atmosphere using the thermogravimetry–Fourier transform infrared spectroscopy technique
Non-isothermal pyrolysis and gasification of Enteromorpha prolifera (also known as Ulva prolifera) under a CO2 atmosphere were investigated by thermogravimetry analysis. The gaseous products were measured online with Fourier transform infrared spectroscopy coupled with thermogravimetry. The kinetic parameters of pyrolysis and gasification reactions were obtained using the Coats–Redfern method. The experimental results showed that Enteromorpha prolifera had two derivative thermogravimetry peaks centered at 240 and 800°C, indicating the pyrolysis of organics and gasification of char, respectively. Carboxylic acids, ethers, and alcohols were the dominating condensable products generated from pyrolysis between 230 and 300°C. H2O, CH4, and aliphatic hydrocarbons were also formed in this temperature range, and they were also continuously released at higher temperatures, indicating further polymerization of the freshly generated pyrolytic char. CO was mainly produced between 700 and 900°C, and its yield was much higher than that of the pyrolytic gaseous products. The Ginstling equation (the D4 model) proved to be the most probable mechanism function for both the pyrolysis and gasification stages, with activation energies of 138.30 and 93.43 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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