碱金属钾对Ni基催化剂纤维素水蒸气气化活性的影响

曾志伟; 邹俊; 杨海平; 王贤华; 吴春飞; PT William; 陈汉平

碱金属钾对Ni基催化剂纤维素水蒸气气化活性的影响

1.
华中科技大学煤燃烧国家重点实验室, 湖北武汉 430074;
2.
英国利兹大学能源研究所, 利兹, LS29JT, 英国

基金项目: 国家自然科学基金(51376076,51306066)和国家重点基础研究发展规划(973计划,2013CB228102)资助项目

详细信息

通讯作者:
杨海平,Tel:027-87542417,Fax:027-87545526,E-mail:yhping2002@163.com

中图分类号: TK6
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出版历程
- 收稿日期: 2015-05-13
- 修回日期: 2015-08-05
- 刊出日期: 2015-12-30

Influence of potassium on the performance of nickel-based catalyst in the steam gasification of cellulose

1.
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;
2.
Energy Research Institute, The University of Leeds, Leeds, LS29JT, UK

Funds: The project was supported by National Natural Science Foundation of China (51376076, 51306066)and the Major State Basic Research Development Program of China (937 program, 2013CB228102).

摘要

摘要: 采用两段式催化气化方式研究了生物质热解气化过程中碱金属的挥发对Ni基催化剂活性的影响。实验结果表明,负载K盐的纤维素水蒸气催化气化过程中,K挥发后会在催化剂表面沉积,而少量K的存在和表面沉积不但能够提高镍基催化剂的抗积炭能力,而且有助于提高其催化活性,产生更多的氢气。然而纤维素中K的浓度过大,将会抑制Ni基催化剂的效果;K在催化剂上的沉积随催化剂循环次数的增加而增加,K的含量愈高,对催化剂的抑制效果愈明显,从而缩短了催化剂的使用寿命。
- 碱金属 /
- 镍基催化剂 /
- 纤维素 /
- 水蒸气气化
Abstract: The influence of alkali metal volatilization on the performance of nickel-based catalyst in the steam gasification of cellulose biomass was investigated in a two-stage fixed bed reactor. The results show that potassium is deposited on the catalyst surface with the volatilization of potassium salt during the catalytic steam reforming of potassium-loaded cellulose. The existence and deposition of proper amount of potassium may suppress the coke deposition and enhance the activity of nickel-based catalyst, which is of benefit to producing more hydrogen in the steam gasification of biomass. However, excessive amount of potassium loaded in cellulose may reduce the activity of nickel-based catalyst; moreover, with the repetitious operations, potassium is accumulated on the catalyst surface, which may lead to an obvious inhibitory effect on the activity and stability of nickel-based catalyst in the steam gasification of biomass.
- alkali metals /
- nickel-based catalyst /
- cellulose /
- steam gasification

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