Role of iron catalyst in fate of fuel nitrogen during coal pyrolysis

被引:89
|
作者
Mori, H [1 ]
Asami, K [1 ]
Ohtsuka, Y [1 ]
机构
[1] TOHOKU UNIV,INST CHEM REACT SCI,SENDAI,MIYAGI 98077,JAPAN
关键词
D O I
10.1021/ef960035d
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The fate of fuel nitrogen during the pyrolysis of brown and bituminous coals at 900 degrees C, in the presence of iron precipitated from FeCl3 solution, has been studied with a fluidized bed reactor. The catalysts at 0.2-0.7 wt % Fe promote N-2 formation, whereas they lower nitrogen conversions to HCN, NH3, N-containing oil, tar, and char. The nitrogen distribution is not changed significantly by increasing iron loading. The effect of the iron on nitrogen distribution is larger with brown coal, the conversion to N-2 being approximate to 50 and approximate to 20% for brown and bituminous coals, respectively. The size of iron particles is smaller in brown coal chars, which appears to lead to a larger catalytic effect. Comparison of nitrogen mass balances in the presence and in the absence of iron shows that N-2 comes from not only volatile nitrogen but also char nitrogen. The X-ray diffraction measurements reveal the presence of graphitized carbon as well as cementite (Fe3C) in brown coal chars. These observations suggest that carbon atoms in the char substrate interact with fine particles of metallic iron and that interstitial iron nitrides formed in this process are decomposed to N-2.
引用
收藏
页码:1022 / 1027
页数:6
相关论文
共 50 条
  • [41] Fate of catalyst during catalytic pyrolysis of biomass and relevant model compounds
    Du Shoucheng
    Valla, Julia
    Bollas, Georgios M.
    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 2013, 245
  • [42] The influence of mineral matter and catalyst on nitrogen release during slow pyrolysis of coal and related material: A comparative study
    Wu, ZH
    Sugimoto, Y
    Kawashima, H
    ENERGY & FUELS, 2002, 16 (02) : 451 - 456
  • [43] Nitrogen transformation during coal decoulping combustion I: release behavior of coal-nitrogen during pyrolysis stage
    Xie, Jian-Jun
    Yang, Xue-Min
    Zhu, Wen-Kui
    Ding, Tong-Li
    Song, Wen-Li
    Lin, Wei-Gang
    Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology, 2012, 40 (08): : 919 - 926
  • [44] EFFECT OF ARGON AND NITROGEN ATMOSPHERES AND CRACKING CATALYST ON FLASH PYROLYSIS OF MAKUM COAL
    BANERJEE, NN
    GHOSH, B
    NAIR, CSB
    FUEL, 1977, 56 (02) : 192 - 194
  • [45] Experimental investigation on char nitrogen conversion during coal pyrolysis
    Yan, Xiao
    Che, Defu
    Xu, Tongmo
    Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University, 2004, 38 (09): : 980 - 984
  • [46] The rate of nitrogen release during high pressure coal pyrolysis
    Tomeczek, J
    Gil, S
    PROSPECTS FOR COAL SCIENCE IN THE 21ST CENTURY, 1999, : 665 - 668
  • [47] THE EVOLUTION OF FUEL NITROGEN DURING RAPID COAL DEVOLATILIZATION
    MAN, CK
    GIBBONS, JR
    PENDLEBURY, KJ
    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1992, 203 : 14 - FUEL
  • [48] Impact of temperature and fuel-nitrogen content on fuel-staged combustion with coal pyrolysis gas
    Greul, U
    Spliethoff, H
    Magel, HC
    Schnell, U
    Ruediger, H
    Hein, KRG
    Li, CZ
    Nelson, PF
    TWENTY-SIXTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION, VOLS 1 AND 2, 1996, : 2231 - 2239
  • [49] Occurrence and Fate of Some Trace Elements during Pyrolysis of Yima Coal, China
    Chen Yiwei
    Liu Guijian
    Wang Lei
    Kang Yu
    Yang Jianli
    ENERGY & FUELS, 2008, 22 (06) : 3877 - 3882
  • [50] Fate of the chlorine and fluorine in a sub-bituminous coal during pyrolysis and gasification
    Takeda, M
    Ueda, A
    Hashimoto, H
    Yamada, T
    Suzuki, N
    Sato, M
    Tsubouchi, N
    Nakazato, Y
    Ohtsuka, Y
    FUEL, 2006, 85 (02) : 235 - 242