Effect of atmosphere on carbon deposition of Ni/Al2O3 and Ni-loaded on lignite char during reforming of toluene as a biomass tar model compound

被引:85
作者
Cao, Jing-Pei [1 ]
Ren, Jie [1 ]
Zhao, Xiao-Yan [1 ]
Wei, Xian-Yong [1 ]
Takarada, Takayuki [2 ]
机构
[1] China Univ Min & Technol, Minist Educ, Key Lab Coal Proc & Efficient Utilizat, Xuzhou 221116, Jiangsu, Peoples R China
[2] Gunma Univ, Div Environm Engn Sci, 1-5-1 Tenjin Cho, Kiryu, Gunma 3768515, Japan
基金
中国国家自然科学基金;
关键词
Carbon deposition; Toluenereforming; Ni-loaded on lignite char; S/C ratio; Deactivation; HYDROGEN-RICH GAS; NICKEL-CATALYSTS; NATURAL-GAS; STEAM; GASIFICATION; PYROLYSIS; METHANE; CO2; DECOMPOSITION; VOLATILES;
D O I
10.1016/j.fuel.2017.12.121
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
Toluene as a model tar compound was used to study the effect of atmosphere on carbon deposition during biomass tar reforming. A novel Ni-loaded on lignite char (Ni/LC) and commercial Ni/Al2O3 was employed for stability evaluation in a thermogravimetric analyzer. The mechanism of coke formation under N-2, H-2 and steam with different steam/carbon (S/C) ratio were investigated during 5 h test. Nickel particle growth is the main reasons responsible for the deactivation of Ni-based catalysts for tar reforming. Steam remarkably suppressed the carbon deposition on Ni/Al2O3, especially in a high S/C ratio. Ni/Al2O3 exhibited high activity and stability for 5 h operation in S/C ratio of 2. H-2 significantly promoted the carbon deposition on Ni/Al2O3 and caused the catalyst deactivation within 0.5 h. Ni/LC exhibited great resistance to coke deposition under inert and H-2 reforming of toluene. The catalysts before and after catalytic cracking were characterized by X-ray diffraction and transmission electron microscopy to investigate the behavior of carbon deposition. Except for H-2 reforming, an obvious change of the Ni crystallite size (NCS) can be found after reforming for 5 h under all conditions used in this study. The NCS in Ni/LC was significantly increased with increasing time and S/C ratio, which should be partly responsible for the deactivation of the Ni/LC.
引用
收藏
页码:515 / 521
页数:7
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