摘要
选择两种矿物质含量不同、硫含量相近的炼焦煤进行HCl-HF-CrCl2联合脱除矿物质实验,将脱矿物质后的煤分别在300℃,500℃,700℃和900℃下热解,用XPS研究煤中有机硫形态在热解过程中的变迁规律.将S2p谱用Lorentzian-Gaussian拟合分为3个峰:有机硫化物(163.3eV±0.4eV)、噻吩(164.1eV±0.2eV)和亚砜(166.0eV±0.5eV).结果表明,脱除矿物质后的煤中不存在硫铁矿硫和硫酸盐硫,煤中的有机硫分布是均匀的,以三种形态赋存,即有机硫化物硫、噻吩硫和亚砜硫,在两种脱矿物质后的煤中都未检测到砜类硫.两种煤中的有机硫化物在700℃时分解完全,低温下有机硫化物硫主要以气体形式逸出,高温下低价态的有机硫化物硫可与煤基质结合转化成噻吩硫;噻吩硫含量在300℃以下无明显变化,随温度升高,噻吩硫含量有所增加;亚砜硫在整个热解区间变化无明显规律.
Two coking coals with different content of mineral matter and similar sulfur content were demineralized combined by HCl-HF-CrCl2.The deashed coals were pyrolyzed under argon atmosphere at 300 ℃,500 ℃,700 ℃ and 900 ℃ to get transformation of organic sulfur functionality occurring during pyrolysis.The XPS S2p spectra obtained were curve-resolved into three peaks with Lorentzian-Gaussian method：sulphidic（163.3 eV±0.4 eV）,thiophenic（164.1 eV±0.2 eV） and sulfoxide（166.0 eV±0.5 eV）.It has been demonstrated that there are not exist pyrite and sulfate in deashed coal,and organic sulfur in coal distribution is even,they occurrence in three kinds of form,namely,organic sulfide,thiophenic and sulfoxide,there are not exist sulfone in two deashed coals.The organic sulfide can decomposed completely at 700 ℃ in two coals,which evolved in the form of gas under lower temperature and which can formed thiophenic compounds under higher temperature.The content of thiophenic increase with the temperature rise but has unobvious change before 300 ℃,the change of sulfoxide is irregular.
出处
《煤炭转化》
CAS
CSCD
北大核心
2014年第2期42-46,共5页
Coal Conversion
基金
国家自然科学基金资助项目(21276156)
关键词
有机硫变迁
热解
XPS
organic sulfur transformation
pyrolysis
XPS
