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Investigation of Inorganic Sulfur Decomposition in a Coal-Like Environment During Pyrolysis

徐龙
倪晋仁

Publication date

January 2005

DOI

10.3321/j.issn:0250-3301.2005.02.014

Publisher

环境科学

Journal

issn:0250-3301

Abstract

采用活性焦作为构造煤大分子网络的基质,将无机硫(黄铁矿、硫酸亚铁)混合于其上,形成模拟煤的环境.利用程序升温热解-火焰光度检测器或质谱联用(TPD-FPD/MS)技术和X-射线吸收精细结构(EXAFS)光谱对比研究了FeS2、FeSO4在活性焦上及纯态下热分解过程中硫逸出的动态特征及结构变化.结果表明:担载于活性焦上FeSO4的分解主要发生在200℃～500℃,而纯态FeSO4的分解温度范围为450℃～600℃,说明活性焦的存在使其分解温度显著降低,且硫的逸出情况更为复杂.黄铁矿与活性焦的物理混合并没有使FeS2的分解温度降低,但对其分解程度有一定的影响,并与热解气氛密切相关;温度高于400℃后FeS2分解的硫开始大量逸出,在550℃左右基本失去结构中与铁配位的第2层硫原子而形成FeS.中国博士后科学基金PubMed中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)0269-732

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