Enhanced CO2 sorption performance of CaO/Ca3Al2O6 sorbents and its sintering-resistance mechanism

被引：70

作者：

Jing, Jie-ying ^{[1
]}

Li, Ting-yu

Zhang, Xue-wei

Wang, Shi-dong

Feng, Jie

Turmel, William A.

Li, Wen-ying ^{[1
]}

机构：

[1] Taiyuan Univ Technol, Key Lab Coal Sci & Technol, Minist Educ & Shanxi Prov, Taiyuan 030024, Peoples R China

来源：

APPLIED ENERGY | 2017年 / 199卷

基金：

中国国家自然科学基金;

关键词：

CaO; Ca3Al2O6; Sintering-resistance mechanism; CO2; sorption; Cyclic sorption stability; CAO-BASED SORBENT; HYDROGEN-PRODUCTION; CAPTURE PERFORMANCE; SYNTHETIC SORBENT; STEAM HYDRATION; METHANE; CAPACITY; STABILITY; CATALYST; CYCLE;

D O I：

10.1016/j.apenergy.2017.03.131

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：

CaO-based CO2 sorbents play a significant role in sorption enhanced methane steam reforming process for hydrogen production and CO2 emission reduction. However, the sorbents suffer from decreasing CO2 sorption capacity and stability due to the sintering of CaO grains. In this study, we modified CaO sorbents by incorporating Al to obtain CaO/Ca3Al2O6 sorbents via a modified sol-gel method. CO2 sorption evaluation shows that the relative quantity of CaO to Al2O3 plays an overwhelming role in the CO2 sorption capacity and stability of the CaO/Ca3Al2O6 sorbents. Superior CO2 sorption ratio (51.92% for sorbent C8A2 at 500 degrees C) is achieved, which is 5 times higher than that of the as-synthesized pure CaO sorbent. The high CO2 sorption ratio is due to the existence of inert Ca3Al2O6, which decreases the diffusion resistance of CO2 through product layer during the carbonation reaction. Meanwhile, the superior CO2 cyclic sorption stability is ascribed to the small original surface free energy of the as-synthesized sorbents. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：225 / 233

页数：9

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