化工进展 ›› 2023, Vol. 42 ›› Issue (12): 6620-6630.DOI: 10.16085/j.issn.1000-6613.2023-0090

• 资源与环境化工 • 上一篇    

液化残渣基CO2吸附剂的制备与性能优化

崔倩1(), 王岸楠1, 陈再明2, 孙峤昳1, 王保登1, 王永胜3, 孙楠楠4, 胡剑2, 李井峰5, 熊日华1()   

  1. 1.国家能源集团北京低碳清洁能源研究院,北京 102209
    2.国能浙江宁海发电有限公司,浙江 宁波 315612
    3.中国神华煤制油化工有限公司鄂尔多斯煤制油分公司,内蒙古 鄂尔多斯 017209
    4.中国科学院上海高等 研究院低碳转化科学与工程重点实验室,上海 201210
    5.国家能源投资集团有限责任公司,北京 100011
  • 收稿日期:2023-01-19 修回日期:2023-03-20 出版日期:2023-12-25 发布日期:2024-01-08
  • 通讯作者: 熊日华
  • 作者简介:崔倩(1991—),女,硕士,工程师,研究方向为CCUS、新能源。E-mail:qian.cui.c@chnenergy.com.cn

Preparation and performance optimization of liquefied residue-based CO2 adsorbents

CUI Qian1(), WANG Annan1, CHEN Zaiming2, SUN Qiaoyi1, WANG Baodeng1, WANG Yongsheng3, SUN Nannan4, HU Jian2, LI Jingfeng5, XIONG Rihua1()   

  1. 1.National Institute of Clean and Low Carbon Energy, Beijing 102209, China
    2.Guoneng Zhejiang Ninghai Power Generation Co. , Ltd. , Ningbo 315612, Zhejiang, China
    3.Ordos Coal-to-Oil Sub-Company, China Shenhua Coal-to-Oil Chemical Co. , Ltd. , Ordos 017209, Inner Mongolia, China
    4.CAS Key Lab of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
    5.CHN Energy Investment Group Co. , Ltd. , Beijing 100011, China
  • Received:2023-01-19 Revised:2023-03-20 Online:2023-12-25 Published:2024-01-08
  • Contact: XIONG Rihua

摘要:

以煤液化残渣(CLR)为原料制备CO2吸附剂,在实现碳减排的同时,可有效提高煤直接液化工艺的经济性和环保价值。本文采用神华煤直接液化残渣为碳源,通过预氧化、炭化活化等工艺,制备出了吸附性能较优的CO2吸附剂。利用热重分析仪(TGA)、低温氮吸附仪(BET)、扫描电镜(SEM)以及透射电子显微镜(TEM)等分析手段对吸附材料的微观形貌、孔径结构以及吸附性能进行了表征测试。结果显示,低灰分液化残渣所制备的吸附材料具有更高的比表面积和更多的微孔结构,更有利于CO2的吸附。以低灰分液化残渣为原料,在较优活化条件下(活化剂/原料质量比为1∶1、升温速率5℃/min、活化时间1h)制备的CO2吸附剂表现出良好的吸附性能,在40℃、15%(体积分数)CO2模拟烟气条件下的CO2吸附容量为4.47%(质量分数),在0℃、1bar(1bar=105Pa)条件下的CO2吸附容量可高达27.70%(质量分数),低温吸附性能优异,吸附速率快且具有良好的循环稳定性。

关键词: 煤液化残渣, 二氧化碳, 二氧化碳捕集, 吸附剂, 低温吸附

Abstract:

Using coal liquefaction residue (CLR) as the raw material to prepare CO2 adsorbents can effectively improve the economic and environmental value of direct coal liquefaction process while achieving carbon emission reduction, which is of great significance. The direct liquefaction residue of Shenhua coal was used as carbon source, and the CO2 adsorbents with better adsorption performance were prepared through the process of pre-oxidation and carbonization activation. The microstructure, pore size structure and adsorption properties of the adsorbents were characterized and tested by thermogravimetric analyzer (TGA), low temperature nitrogen adsorption instrument (BET), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results showed that the adsorbents prepared from low ash liquefied residue had higher specific surface area and more microporous structure, which were more conducive to the adsorption of CO2. The CO2 adsorbent prepared from low ash liquefied residue under optimal activation conditions (mass ratio of activator/raw material was 1∶1, heating rate was 5℃/min, activation time was 1h) showed good adsorption performance. The CO2 adsorption capacity at 40℃ and 15%CO2 simulated flue gas was 4.47%. At 0℃ and 1bar, the CO2 adsorption capacity could be up to 27.70%, the low temperature adsorption performance was excellent, the adsorption rate was fast, and it had good cycle stability.

Key words: coal liquefaction residual, carbon dioxide, CO2 capture, adsorbents, low temperature adsorption

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