TG-MS联用技术研究木薯渣热化学特性

摘要

采用热重分析法和热重质谱联用技术并结合FTIR光谱考察了木薯渣的热化学特性,同时研究了厌氧处理的木薯渣和未经厌氧处理的木薯渣的热失量和气态产物的析出行为,结果表明厌氧处理的木薯渣和未经厌氧处理的木薯渣热解都可以分为3个阶段:水析出阶段(25~200 ℃)、挥发分析出阶段(200~600 ℃)和无机物的分解阶段(600~1 000 ℃),但未经厌氧处理的木薯渣在热解主体阶段有机质释放量高。利用TG-MS联用技术考察了2种原料的热解特性,发现两种木薯渣热解主要析出的气体要是H₂、H₂O、CO、CH₄和CO₂等,且气体生成曲线趋势类似。同时研究不同升温速率和粒径对木薯渣热解过程和氢气产物析出行为的影响,表明升温速率增加,H₂的产率在高温区增加,粒径增大有利于氢气的生成。根据Coats-Redfern积分法计算结果,木薯渣热解主体阶段的可用一级动力学方程描述,升温速率对木薯渣热解的活化能影响不大。

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	高慧
	李复生
	张敏华

关键词：木薯渣热化学特性 TG-MS 富氢气体

Abstract：

The thermochemical property of cassava dregs was investigated by means of thermogravimetric-mass spectrometry and Fourier Transform Infrared Spectrometer (FTIR) methods. The mass loss and evolving rates of the gaseous products during pyrolyisis of anaerobic digested cassava dregs and undigested cassava dregs were also measured. The results showed that the pyrolysis of cassava dregs processes could be divided into three stages: volatilization of water(25—200 ℃), decomposition of organic substances(200—600 ℃), decomposition of inorganic substances(600—1 000 ℃). The amount of the organic substances released from the anaerobic digested cassava dregs was smaller than that from undigested cassava dregs. The pyrolysis behavior of anaerobic digested cassava dregs and undigested cassava dregs were analyzed by coupled TG-MS analyzer. The major gas species of pyrolysis, H₂, H₂O, CO, CH₄, CO₂, were monitored with mass spectrometry and the trend of gas released curve is similar. The hydrogen yield in the pyrolysis is related to the heating rates and particle size. The common tendency for hydrogen product tend are as follows: higher heating rate and larger particle size result in higher hydrogen yield. Based on the results of Coats-Redfern integration method, the pyrolysis of cassava dregs could be described by first-order kinetics equations and increasing heating rate did not show evident influence on the apparent activation.

Keywords： cassava dregs； thermochemical property； TG-MS； hydrogen-rich gases

Received 2014-03-12;

Corresponding Authors: 张敏华,E-mail:mhzhang@tju.edu.cn。 Email: mhzhang@tju.edu.cn

About author: 高慧(1988-),女,硕士研究生,主要从事绿色合成与转化方向研究。

引用本文:

高慧, 李复生, 张敏华.TG-MS联用技术研究木薯渣热化学特性[J]. 化学工业与工程, 2016,33(2): 30-36

Gao Hui, Li Fusheng, Zhang Minhua.Thermochemical Property of Cassava Dregs with TG-MS Analyzer[J]. Chemcial Industry and Engineering, 2016,33(2): 30-36

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