Hydrogen-rich syngas production by catalytic cracking of tar in wastewater under supercritical condition

被引:26
|
作者
Yan, Mi [1 ]
Liu, Jianyong [1 ]
Hantoko, Dwi [1 ]
Kanchanatip, Ekkachai [1 ,2 ]
Grisdanurak, Nurak [2 ]
Cai, Yi [3 ]
Gao, Zengliang [4 ]
机构
[1] Zhejiang Univ Technol, Inst Energy & Power Engn, Hangzhou 310014, Zhejiang, Peoples R China
[2] Thammasat Univ, Ctr Excellence Environm Catalysis & Adsorpt, Fac Engn, Pathum Thani 12120, Thailand
[3] Zhejiang Energy Grp R&D, Hangzhou 310026, Zhejiang, Peoples R China
[4] Zhejiang Univ Technol, Inst Proc Equipment & Control Engn, Hangzhou 310032, Zhejiang, Peoples R China
基金
浙江省自然科学基金;
关键词
Catalytic; Tar cracking; Supercritical water; Syngas; Hydrogen; BIOMASS TAR; COAL-TAR; GASIFICATION; NI/AL2O3; ELECTRICITY; MECHANISMS; OXIDATION; REMOVAL; PHENOL; SYSTEM;
D O I
10.1016/j.ijhydene.2019.05.234
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This paper presents the results from experimental study of syngas production by catalytic cracking of tar in wastewater under supercritical condition. Ni/Al2O3 catalysts were prepared via the ultrasonic assisted incipient wetness impregnation on activated alumina, and calcined at 600 degrees C for 4 h. All catalysts showed mesoporous structure with specific surface area in a range of 146.6-215.3 m(2)/g. The effect of Ni loading (5-30 wt%), reaction temperature (400-500 degrees C), and tar concentration (0.5-7 wt%) were systematically investigated. The overall reaction efficiency and the gas yields, especially for H-2, were significantly enhanced with an addition of Ni/Al2O3 catalysts. With 20%Ni/Al2O3, the H-2 yield increased by 146% compared to the non-catalytic experiment. It is noteworthy that the reaction at 450 degrees C with the addition of 20%Ni/Al2O3 had a comparable efficiency to the reaction without catalyst at 500 degrees C. The maximum H-2 yield of 46.8 mol/kgtar was achieved with 20%Ni/Al2O3 at 500 degrees C and 0.5 wt% tar concentration. The catalytic performance of the catalysts gradually decreased as the reuse cycle increased, and could be recovered to 88% of the fresh catalyst after regeneration. 20%Ni/Al2O3 has a potential to improve H-2 production, as well as a good reusability. Thus, it is considered a promising catalyst for energy conversion of tar in wastewater. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:19908 / 19919
页数:12
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