CCUS carbon capture, utilization and storage is one of the key technologies to deal with global climate change, which has been highly valued by countries all over the world and has increased research and development efforts, but there are still difficulties in industrialization. This paper introduces a green preparation process of zeolite for carbon dioxide adsorption

Ding, Bohao

Du, Tao

Shi, Shang

Wang, YiSong

Zhou, Xinyu

Repository of Belarusian National Technical University (BNTU)

67  References 1. 叶康平, 铁氧体超构材料的电磁波吸收和超散射研究, 2021, 南京大学. 第 90页. 2. Dewar G. Candidates for μ < 0,  < 0 nanostructures. Int J Mod Phys B, 2001, 15: 3258–3265 3. 毕科等, 基于铁磁共振的超材料研究进展. 科学通报, 2013. 58(19): 第1785–1795页. 4. Adenot-Engelvin, A. L., et al., Microwave properties of ferromagnetic composites and metamaterials. Journal of the European Ceramic Society, 2007. 27(2): p. 1029–1033. 5. Adenot-Engelvin, A., C. Dudek and O. Acher, Microwave permeability of met-amaterials based on ferromagnetic composites. Journal of Magnetism and Magnetic Materials, 2006. 300(1): p. 33–37.  УДК 666.3 工业生态与节能——粉煤灰基 CO2吸附沸石绿色制备 周鑫宇 (Zhou Xinyu), 时尚 (Shi Shang), 丁伯豪 (Ding bohao), 杜涛 (Du Tao), 王义松 (Wang YiSong) 东北大学 (Northeastern University) e-mail: 20203355@stu.neu.edu.cn  Summary. CCUS carbon capture, utilization and storage is one of the key technologies to deal with global climate change, which has been highly valued by countries all over the world and has in-creased research and development efforts, but there are still difficulties in industrialization. This paper introduces a green preparation process of zeolite for carbon dioxide adsorption.  Human beings release too much greenhouse gases such as CO2 in production and life, and the anthropogenic increase in atmospheric greenhouse gas concentrations is the main factor of cur-rent and future climate change, and if measures are not taken, CO2 concentrations will continue to increase for many years in the future [1]. As a major CO2 emitter, China is facing arduous CO2 emission reduction tasks, and carbon capture and utilization technology is one of the important technologies to solve this problem. At present, CO2 capture technology has been industrially ap-plied, and the preparation of high-efficiency CO2 adsorbents is the most critical part. Based on the above problems, the research on finding better technologies to prepare high catchability for captur-ing and storing CO2 and optimizing them to achieve the ideal level has been gradually emphasized. At present, there are many mainstream porous adsorption materials in the world,Such as type A zeolite, type X zeolite, ZSM-5, MOFs, etc. [2]. Peter G. Boyd et al. analyzed some porous materials with optimal adsorption for CO2 adsorption separation through comparative studies.Patrick Nugent et al. [3] synthesized metal-organic framework materials with strong carbon capture performance. However, in the existing zeolite synthesis process, it is impossible to avoid the generation of waste liquid, and the treatment process of waste liquid will cause secondary pollution to the environment. In addition, coal, as one of the most stable and effective energy sources in our country, will produce a large amount of fly ash in the process of its combustion. To 2000, China's coal ash emis-sions about 160 million tons. The treatment and utilization of fly ash has become a major environ-mental protection problem in today's world.Many teams have explored the influence of different synthesis methods on the types and properties of zeolite prepared from fly ash for the problem of how to rationally recycle and apply fly ash, a solid waste with huge emissions [4]. Wu Xuecheng's team [5] of Zhejiang University processed fly ash by acid leaching and alkali melting, synthesized various types of zeolite, and studied its adsorption performance, verifying the feasibility of zeolite synthesis from fly ash. According to current theoretical analysis and previous experiments, four reaction parameters can be determined: alkali-ash mass ratio (referred to as alkali-ash ratio for short), crystallization time, liquid-solid mass ratio (referred to as liquid-solid ratio for short) and crystallization tempera-ture.Among them, the ratio of alkali to ash affects the concentration of alkali in raw materials, and 68  the addition of NaOH can dissolve the amorphous phase in raw materials, destroy mullite and Shi Ying phases, decompose them, and promote the activation of SiO2 and Al2O3. Liquid-solid ratio plays an important role in the synthesis of zeolite. Too large or too small liquid-solid ratio directly affects the alkalinity of solution and the crystallinity of zeolite products. Li Bo [6] explored the role of liquid-solid ratio in the synthesis of zeolite A. The results showed that when the liquid-solid ratio was 5:1, the mass fraction of zeolite A was 59 %, which was the highest compared with that of zeo-lite A synthesized under other liquid-solid ratios. Crystallization time affects the nucleation and crystal nucleus growth process of zeolite.At the same time, it will affect the crystal particle size of synthetic zeolite. Generally speaking, the higher the crystallization temperature, the larger the parti-cle size of zeolite. The crystallization time will be prolonged if the crystallization temperature is too low; High crystallization temperature will produce hydroxysodalite, resulting in low purity of zeo-lite. Therefore, too high or too low crystallization temperature is not conducive to the synthesis of zeolite A. Lian Xianjin et al. [7] considered the time required for crystallization and the quality of zeolite, and considered that the ideal crystallization temperature was 80~100 ℃. By studying the influence of crystallization time, solid-liquid ratio, silicon aluminum ratio and other conditions on the synthesis of zeolite, as well as the recycling of waste liquid, we analyze how to prepare zeolite with the best performance. The characteristic peaks, crystallinity and cell pa-rameters were analyzed and determined by X-ray diffractometer (D8 ADVANCE, Brooke, Germa-ny); Use a physical adsorption instrument (ASAP 2460, McMurray Teck Instrument Co., Ltd.) to test the nitrogen adsorption desorption isotherm of the sample at liquid nitrogen temperature; Fouri-er infrared spectrum analyzer (Cary-660-FTIR, Agilent Technology Co., Ltd.) was used to analyze the functional group structure of the adsorbent molecule, and the characterization and performance test of the sample were completed. Based on the previous exploration and the above experimental exploration, it is proved that the preparation of fly ash based zeolite A by alkali melting hydrothermal synthesis has extremely high carbon dioxide adsorption performance, and there is still a large amount of Al2O3 and SiO2 in the waste liquid that do not participate in the reaction, so the reaction can continue.Considering the reuse of pollutants and no secondary pollution of waste liquid, a green preparation scheme of zeolite A was designed and optimized.The use of cheap raw materials and template free synthesis methods will contribute to the large-scale application of green synthesis processes in the future. References 1. Meinshausen M, Nicholls Z, Lewis J, et al. The shared socio-economic pathway (SSP) greenhouse gas concentrations and their extensions to 2500[J]. Geoscientific Model Development, 2020, 13(8): 3571–3605. 2. Nugent P, Belmabkhout Y, Burd S D, et al. Porous materials with optimal adsorption ther-modynamics and kinetics for CO2 separation[J]. Nature, 2013, 495(7439):80–84. 3. Boyd P G, Chidambaram A, E García-Díez, et al. Data-driven design of metal–organic frameworks for wet flue gas CO2 capture[J]. Nature, 2019, 576(7786):253-256. 4. 任晓宇, 刘少俊, 曲瑞阳, 等. 制备方法对粉煤灰合成沸石的种类及性能的影响[J]. 煤炭学报, 2020, 45(5):10. 5. 任晓宇. 粉煤灰基沸石的合成、生长机理及其吸附性能的研究[D].浙江大学,2020. 6. 李勃. 粉煤灰合成 A 型沸石处理制革废水试验研究[D]. 兰州：兰州大学，2009. 7. 廉先进，葛宝勋，李凯琦. 用煤矸石作原料合成 A 型沸石分子筛工艺条件的探讨［J］.郑州大学学报：理学版，1998（2）：36-41.   

工业生态与节能——粉煤灰基CO2 吸附沸石绿色制备

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工业生态与节能——粉煤灰基CO2 吸附沸石绿色制备

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