摘要
为进一步提高LDH基材料的CO_2吸附性能以及吸-脱循环稳定性能,采用浸渍法将碱金属硝酸盐负载在LDH基材料上,分别探究了Mg/Al比、合成pH、碱金属硝酸盐种类和负载量等对其CO_2吸附性能的影响。结果表明,当LDH中Mg/Al比例为20,合成pH为10,负载30%Li0.3Na0.18K0.52NO3后,在最佳煅烧温度500℃,最佳吸附温度260℃的条件下,其CO_2吸附量最大可达到4.64 mmol·g-1。另外,该材料在经历了10个吸-脱附循环过程后,表现出较好的循环稳定性能。通过分析可知,碱金属硝酸盐没有参与CO_2吸附反应,碱金属硝酸盐的负载对LDH的CO_2吸附性能有极大地促进作用。
In order to further improve the CO2 sorption performance and enhance the repeatable sorption-desorption cycling stability of LDH-based materials, alkali metal nitrate was loaded onto LDH-based material by immersion method. The effect of Mg/Al ratio, synthesis of pH, types of alkali metal nitrates and their loading amount on CO2 sorption capacity were investigated. The results showed that the optimal conditions to achieve the maximum sorption performance were indentified, including Mg/Al ratio of LDH is 30, synthetic pH is 10, Li0.3Na0.18K0.52NO3 loading is 30%, calcination temperature is 500 ℃ and sorption temperature is 260 ℃. The maximum CO2 sorption capacity can reach as high as 4.64 mmol·g-1. In addition, the material exhibited good cycling stability during 10 sorption-desorption cycles. According to the analysis, alkali metal nitrates were not participated in the CO2 sorption reaction. Therefore, based on the above-mentioned results, loading with alkali metal nitrates on the LDH greatly promoted the CO2 sorption performance.
作者
王君雅
羊莹
宁平
WANG Junya;YANG Ying;NING Ping(Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2018年第12期3379-3388,共10页
Chinese Journal of Environmental Engineering
基金
云南省教育厅科学研究基金项目(2017ZZX137)
昆工理工大学高层次人才平台建设项目(201722017)
国家自然科学基金青年基金项目(51802135)
关键词
类水滑石
CO2吸附
碱金属硝酸盐
循环稳定性能
layered double hydroxide
C02sorption
alkali metal nitrate
sorption-desorption cycling stability
