Effect of Ce, Zr on cyclic performance of CaO-based CO2 sorbents

doi:10.11949/j.issn.0438-1157.20141071

CIESC Journal ›› 2015, Vol. 66 ›› Issue (2): 612-617.DOI: 10.11949/j.issn.0438-1157.20141071

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Effect of Ce, Zr on cyclic performance of CaO-based CO₂ sorbents

ZHANG Lei^1,2, ZHANG Li^1,2, YAN Yunfei^1,2, YANG Zhongqing^1,2, GUO Mingnü¹

1 Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China;
2 School of Power Engineering, Chongqing University, Chongqing 400044, China

Received:2014-07-16 Revised:2014-09-28 Online:2015-02-05 Published:2015-02-05
Supported by:
supported by the Fundamental Research Funds for the Central Universities (CDJZR12140034), the Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education of PRC, the Fund for Visiting Scholars (LLEUTS-201301).

掺杂Ce、Zr对CO₂钙基吸附剂循环特性的影响

张雷^1,2, 张力^1,2, 闫云飞^1,2, 杨仲卿^1,2, 郭名女¹

1 低品位能源利用技术及系统教育部重点实验室(重庆大学), 重庆 400044;
2 重庆大学动力工程学院, 重庆 400044

通讯作者: 张力
基金资助:
中央高校基本科研业务费专项资金(CDJZR12140034);低品位能源利用技术及系统教育部重点实验室访问学者基金项目(LLEUTS-201301)。

Abstract

Abstract:

CaO-based sorbents with Ce and Zr as dopants were prepared by the method of wet mixing and subsequent calcination. The cyclic CO₂ sorption/desorption performance of 24 sorbents was tested with thermogravimetric analyzer (TGA). CeO₂ could increase CO₂ sorption rate in the diffusion-controlled regime because the large quantity of oxygen vacancies in CeO₂ could facilitate CO₂ diffusion through the produced CaCO₃ layer and then react with the uncreated CaO. Dispersion of CeO₂ on CaO could also inhibit agglomeration of CaO crystal and its sintering at high temperature. Stability of CaO in sorption/desorption cycle increased with increasing amount of CeO₂ in the sorbents. With a high Tammann temperature, the newly produced CaZrO₃ from zirconia and calcium oxide could serve as a supporting framework and effectively restrain sintering.

Key words: oxygen vacancy, CaO-based sorbent, adsorption, CO₂ capture, conversion, stability

摘要：

利用湿法混合-煅烧法将元素Ce、Zr掺杂到CO₂钙基吸附剂中,利用热重分析仪(TGA)研究了24种改性钙基吸附剂吸附CO₂的循环特性。研究发现:CeO₂散布在CaO晶粒之间可抑制晶粒融合,对吸附剂烧结有一定的阻碍作用;CeO₂可明显提高吸附剂在扩散控制阶段对CO₂的吸附速率,原因在于CeO₂中丰富的氧空位可促进CO₂以离子迁移的方式穿过表面产物层到达内部与CaO反应;吸附剂中CeO₂含量越高,稳定性越强;ZrO₂与CaO高温化合成具有高塔曼温度的CaZrO₃,均匀分散在CaO晶粒间,构成稳固的支撑骨架,有效抑制了吸附剂烧结。

关键词: 氧空位, 钙基吸附剂, 吸附, 二氧化碳捕集, 转化率, 稳定性

CLC Number:

TK09

ZHANG Lei, ZHANG Li, YAN Yunfei, YANG Zhongqing, GUO Mingnü. Effect of Ce, Zr on cyclic performance of CaO-based CO₂ sorbents[J]. CIESC Journal, 2015, 66(2): 612-617.

张雷, 张力, 闫云飞, 杨仲卿, 郭名女. 掺杂Ce、Zr对CO₂钙基吸附剂循环特性的影响[J]. 化工学报, 2015, 66(2): 612-617.

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Effect of Ce, Zr on cyclic performance of CaO-based CO₂ sorbents

掺杂Ce、Zr对CO₂钙基吸附剂循环特性的影响

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