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首页> 外文期刊>Energy & fuels >In Situ Analysis of Catalytic Effect of Calcium Nitrate on Shenmu Coal Pyrolysis with Pyrolysis Vacuum Ultraviolet Photoionization Mass Spectrometry
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In Situ Analysis of Catalytic Effect of Calcium Nitrate on Shenmu Coal Pyrolysis with Pyrolysis Vacuum Ultraviolet Photoionization Mass Spectrometry

机译：裂解真空紫外光电离质谱法原位分析硝酸钙对神木煤裂解的催化作用

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摘要

To investigate the effect of calcium mineral on the product distribution of low-rank coal pyrolysis, a Chinese subbituminous coal (Shenmu coal), and samples with 5% and 10% added calcium content, were selected to study with a homemade pyrolysis vacuum ultraviolet photoionization mass spectrometry (py-VUV-PIMS) system. In this system, secondary reactions of the pyrolysis products were generally inhibited because of in situ sampling, soft ionization, and high vacuum environment, which allowed direct detection of the initial pyrolytic products. Most evolved compounds during temperature programmed heating from 30 to 650 degrees C were ionized by a VUV lamp (10.6 eV). The main products indude five categories: alkenes, dienes, aromatics, phenols, and dihydroxy aromatics, which were formed via homolytic scission of weak bonds in side chains and bridges between aromatic nuclei in coal structure. The calcium mineral additives can dramatically affect pyrolytic product distribution, especially oxygen-containing compounds. The main reason is that calcium mineral plays a catalytic role in deoxygenation, which prompted incorporation of oxygen-containing compounds into corresponding aromatics, and resulted in the product of BTX levels increase significantly. The decrease in relative average molecular weight indicated the conversion of heavier components into lighter species, in terms of the observed m/z of the evolved gas components.
机译：为了研究钙矿物对低阶煤热解产物分布的影响，我们选择了一种中国次烟煤（神木煤）以及添加了5％和10％钙含量的样品，以进行自制的热解真空紫外光电离研究。质谱（py-VUV-PIMS）系统。在该系统中，由于原位采样，软电离和高真空环境，通常可以抑制热解产物的二次反应，从而可以直接检测最初的热解产物。在30至650摄氏度的程序升温下，大多数析出的化合物被VUV灯（10.6 eV）电离。主要产品包括五类：烯烃，二烯，芳族化合物，苯酚和二羟基芳族化合物，它们是通过均裂裂解侧链中的弱键和煤结构中芳核之间的桥而形成的。钙矿物添加剂会极大地影响热解产物的分布，特别是含氧化合物。主要原因是钙矿物质在脱氧中起催化作用，促使含氧化合物掺入相应的芳烃中，并导致产物BTX含量显着增加。相对平均分子量的降低表明，根据所观察到的析出气体组分的m / z，较重的组分转化为较轻的物质。

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  • 来源
    《Energy & fuels》 |2018年第2期|1061-1069|共9页
  • 作者

    Zhou Yang; Li Gang; Jin Lijun; Zhou Jian; Wang Jiaofei; Li Yang; Hu Haoquan;

  • 作者单位

    Dalian Univ Technol, Inst Coal Chem Engn, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China;

    Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China;

    Dalian Univ Technol, Inst Coal Chem Engn, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China;

    Dalian Univ Technol, Inst Coal Chem Engn, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China;

    Dalian Univ Technol, Inst Coal Chem Engn, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China;

    Dalian Univ Technol, Inst Coal Chem Engn, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China;

    Dalian Univ Technol, Inst Coal Chem Engn, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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