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煤系高岭土煅烧过程中脱羟基和脱碳动力学：基于气态产物的新型动力学方法

Kinetics of Dehydroxylation and Decarburization of Coal Series Kaolinite during Calcination: A Novel Kinetic Method Based on Gaseous Products.

作者信息

Cheng Simeng, Jiu Shaowu, Li Hui

机构信息

College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.

Shaanxi Ecological Cement Concrete Engineering Technology Center, Xi'an 710055, China.

出版信息

Materials (Basel). 2021 Mar 18;14(6):1493. doi: 10.3390/ma14061493.

DOI:10.3390/ma14061493
PMID:33803732
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8003185/
Abstract

The analysis of gaseous products reveals the characteristics, mechanisms, and kinetic equations describing the dehydroxylation and decarburization in coal series kaolinite. The results show that the dehydroxylation of coal series kaolinite arises from the calcination of kaolinite and boehmite within the temperature range of 350-850 °C. The activation energy for dehydroxylation is 182.71 kJ·mol, and the mechanism conforms to the A2/3 model. Decarburization is a two-step reaction, occurring as a result of the combustion of carbon and the decomposition of a small amount of calcite. The temperature range in the first step is 350-550 °C, and in the second is 580-830 °C. The first step decarburization reaction conforms to the A2/3 mechanism function, and the activation energy is 160.94 kJ·mol. The second step decarburization reaction follows the B3 mechanism function, wherein the activation energy is 215.47 kJ·mol. A comparison with the traditional methods proves that the kinetics method utilizing TG-FTIR-MS is feasible.

摘要

气态产物分析揭示了描述煤系高岭石脱羟基和脱碳过程的特征、机理及动力学方程。结果表明，煤系高岭石的脱羟基作用源于高岭石和勃姆石在350 - 850℃温度范围内的煅烧。脱羟基的活化能为182.71 kJ·mol，其机理符合A2/3模型。脱碳是一个两步反应，是由碳的燃烧和少量方解石的分解导致的。第一步的温度范围是350 - 550℃，第二步是580 - 830℃。第一步脱碳反应符合A2/3机理函数，活化能为160.94 kJ·mol。第二步脱碳反应遵循B3机理函数，其中活化能为215.47 kJ·mol。与传统方法的比较证明，利用TG - FTIR - MS的动力学方法是可行的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/c81435b15347/materials-14-01493-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/8da0dda624fa/materials-14-01493-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/5408e7d35ac3/materials-14-01493-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/e3417beb8755/materials-14-01493-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/e0f0820c9077/materials-14-01493-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/c33042f7c565/materials-14-01493-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/c81435b15347/materials-14-01493-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/8da0dda624fa/materials-14-01493-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/297f2760a933/materials-14-01493-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/b1f87f0e8b5b/materials-14-01493-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/8861d162ea08/materials-14-01493-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/0770bc344c3a/materials-14-01493-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/5408e7d35ac3/materials-14-01493-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/e3417beb8755/materials-14-01493-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/e0f0820c9077/materials-14-01493-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/c33042f7c565/materials-14-01493-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1fbc/8003185/c81435b15347/materials-14-01493-g010.jpg

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