利用稻壳灰水热合成A型沸石的研究
收稿日期: 2024-05-29
网络出版日期: 2024-07-22
基金资助
黑龙江省省属高等学校基本科研业务费科研项目(2021-KYYWF-1462)
Study on hydrothermal synthesis of A-type zeolite from rice husk ash
Received date: 2024-05-29
Online published: 2024-07-22
稻壳灰是稻谷燃烧后产生的副产物,主要富含无定形二氧化硅,通过资源回收和再加工,不仅可以有效减轻其堆积带来的环境负担,还能获得具有高附加值的A型沸石。以稻壳灰为硅源,经过水热反应合成A型沸石,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM),系统研究了硅铝比[n(SiO2)/n(Al2O3)]、NaOH溶液浓度、反应温度、反应时间对所合成沸石样品的物相组成与微观形貌的影响。结果表明,在n(SiO2)/n(Al2O3)为1.4、NaOH溶液浓度为2.5 mol/L、反应温度为100 ℃、反应时间为6.0 h的条件下,能够合成出晶相单一、结晶度高,并且具有明显立方体形貌、轮廓清晰的A型沸石。利用红外光谱(FT-IR)、热重-差热分析(TG-DTA)、氮气吸附-脱附测试等手段对最佳水热条件下合成的A型沸石进行表征。结果表明,水热产物A型沸石显示出一定的热稳定性,并且孔径均一,比表面积为44.468 m2/g,使其在吸附、催化剂载体等领域具有潜在的应用价值。
程妍 , 于天胤 , 张宏洋 . 利用稻壳灰水热合成A型沸石的研究[J]. 无机盐工业, 2025 , 57(6) : 43 -48 . DOI: 10.19964/j.issn.1006-4990.2024-0297
Rice husk ash,a by-product of rice after combustion,mainly contains amorphous silica.Resource recovery and reprocessing of rice husk ash can not only reduce the environmental burden caused by the accumulation,but also obtain the A-type zeolite with high value.Using rice husk ash as silica source,the A-type zeolite was synthesized through hydrothermal reaction.The effects of Si/Al ratio[n(SiO2)/n(Al2O3)],NaOH solution concentration,reaction temperature and reaction time on the phase composition and microscopic morphology of the synthesized zeolite samples were comprehensively investigated using X-ray diffraction(XRD) and scanning electron microscope(SEM).The results indicated that the A-type zeolite with single crystal phase,high crystallinity and well-defined cubic morphology could be obtained under the conditions of n(SiO2)/n(Al2O3) of 1.4,NaOH solution concentration of 2.5 mol/L,reaction temperature of 100 ℃ and reaction time of 6.0 h.The A-type zeolite synthesized under optimal hydrothermal conditions was characterized using fourier transform infrared spectrometer(FT-IR),thermogravimetric analysis(TG-DTA) and N2 adsorption-desorption test.The results showed that the hydrothermal product A-type zeolite exhibited certain thermal stability,had uniform pore size and specific surface area of 44.468 m2/g,making it potentially useful in fields such as adsorption,catalyst carrier.
Key words: rice husk ash; hydrothermal method; A-type zeolite; thermal stability
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