载体对钾基吸附剂脱除CO2的影响
Effect of Supports on CO2 Adsorption Behavior of Potassium-Based Adsorbents
DOI: 10.12677/HJCET.2020.103026, PDF,    科研立项经费支持
作者: 张嘉豪, 潘 华*, 梅 瑜：浙江树人大学，生物与环境工程学院，浙江 杭州
关键词: 碳酸钾；载体；二氧化碳；吸附剂；K2CO3； Support； CO2； Adsorbents
摘要: 采用浸渍法制备了K2CO3/凹凸棒石和K2CO3/TiO2吸附剂，研究了载体对钾基吸附剂脱除CO2的影响。研究表明：K2CO3/凹凸棒石的CO2吸附容量大于K2CO3/TiO2的CO2吸附容量，在333 K时，K2CO3/凹凸棒石和K2CO3/TiO2的吸附容量分别为74.4 mg/g和51.2 mg/g。钾基吸附剂的比表面积和比孔容对CO2吸附性能无明显的正相关性。载体是钾基吸附剂吸附CO2性能差异的一方面原因，凹凸棒石载体的CO2吸附容量为21 mg/g，TiO2载体的CO2吸附容量为12.8 mg/g。碱金属钾在不同载体中的物相差异是造成CO2吸附性能差别的另一原因，在K2CO3/凹凸棒石中，不仅有K2CO3物相，还检测出K2Ca(CO3)2，而在K2CO3/TiO2中，则有K2CO3和K1.6Ti1.6O3物相。在K2CO3/凹凸棒石吸附CO2过程中，K2CO3和部分K2Ca(CO3)2转化成KHCO3。在K2CO3/TiO2吸附CO2过程中，K2CO3转化成KHCO3，而K1.6Ti1.6O3未参与CO2的吸附。
Abstract: Effect of the supports on CO2 adsorption by potassium-based adsorbents was investigated. Both K2CO3/Attapulgite and K2CO3/TiO2 adsorbents were prepared by impregnation method. The results indicated that the capacity for CO2 adsorption of K2CO3/Attapulgite adsorbents is higher than that of K2CO3/TiO2. CO2 adsorption capacity of K2CO3/Attapulgite and K2CO3/TiO2 was 74.4 mg/g and 51.2 mg/g at 333 K, respectively. No direct correlation between the surface area, pore volume and capture capacity was observed on potassium-based adsorbents. The nature of support plays an important role for CO2 adsorption on potassium-based adsorbents. CO2 adsorption capacity of Attapulgite supports was 21 mg/g. However, CO2 adsorption capacity of TiO2 supports was only 12.8 mg/g. The formation of potassium phase is an important factor for CO2 adsorption on potassium-based adsorbents. Not only K2CO3 but also K2Ca(CO3)2 was detect on K2CO3/Attapulgite. Both K2CO3 and K1.6Ti1.6O3 were detected on K2CO3/TiO2. During the CO2 adsorption process on K2CO3/Attapulgite, K2CO3 and part of K2Ca(CO3)2 transformed into KHCO3. In the case of CO2 ad-sorption process on K2CO3/TiO2, only K2CO3 could be transformed into KHCO3. CO2 could not adsorbed by K1.6Ti1.6O3.
文章引用：张嘉豪, 潘华, 梅瑜. 载体对钾基吸附剂脱除CO2的影响[J]. 化学工程与技术, 2020, 10(3): 208-214. https://doi.org/10.12677/HJCET.2020.103026

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