碳纳米复合吸附材料中添加氧化钙在CO_(2)捕获中的应用研究进展

Research Progress in the Application of Calcium Oxide Added to Carbon Nanocomposite Adsorbents in CO_(2) Capture

随着全球变暖日益严重,降低大气中的CO_(2)浓度已成为全世界关注的问题。碱金属(钠和钾等)碳酸盐因吸附温度低被视为有前途的吸附材料并常用作再生干燥吸附剂。但是基于Na_(2)CO_(3)和K_(2)CO_(3)的吸附剂具有反应速率慢或吸附剂再生温度高等问题,因此制备了Na_(2)CO_(3)-碳纳米复合材料,其得出结论是分解-再生反应温度低于碳酸氢钠的温度。Na_(2)CO_(3)-碳纳米复合材料捕获的CO_(2)容量为220-230mg-CO_(2)/g,反应速度约为碳酸钠的1.5或2倍。CaO作为CO_(2)吸附材料,价格低廉,含量丰富具有很高的理论吸附值,一直是高温CO_(2)吸附领域的研究重点。因此对于CaO基吸附材料做了一些总结,发现通过碱金属碳酸盐负载的CaO其CO_(2)吸附容量有着显著的提升,Na_(2)CO_(3)负载的CaO容量可达到6.27mmol/g,但这方面需要进一步研究。本论文中归纳了几种CO_(2)捕获技术基础上,重点围绕吸附剂在CCS中的研究进展,在采用这些方法时可被用作吸附剂的几种材料进行了概述,对各种吸附剂优缺点进行了归纳,展望了碱土金属CaO吸附剂及其碱金属基吸附剂在CO_(2)排放领域的应用前景。

As global warming becomes more and more serious,reducing the concentration of CO_(2)in the atmosphere has become a worldwide concern.Alkali metal(sodium,potassium,etc.)carbonates are regarded as promising adsorbents due to their low adsorption temperature and are often used as regenerated dry adsorbents.But adsorbents based on Na_(2)CO_(3)and K_(2)CO_(3)have problems such as slow reaction rate or high adsorbent regeneration temperature.Therefore,Na_(2)CO_(3)-carbon nanocomposites were prepared,which concluded that the decomposition-regeneration reaction temperature is lower than that of sodium bicarbonate.The carbon dioxide capacity captured by Na_(2)CO_(3)-carbon nanocomposites is 220-230 mg-CO_(2)·g^(-1),and the reaction rate is about 1.5 or 2 times that of sodium carbonate.As a CO_(2)adsorption material,CaO is inexpensive,rich in content and has a high theoretical adsorption value.It has always been the research focus in the field of high-temperature CO_(2)adsorption.Therefore,some conclusions were made on CaO-based adsorption materials,and it was found that the CO_(2)adsorption capacity of CaO supported by alkali metal carbonate has a significant increase,and the capacity of CaO supported by Na_(2)CO_(3)can reach 6.27 mmol/g,but this aspect requires further research.Based on several CO_(2)capture technologies,this paper focuses on the research progress of adsorbents in CCS.Several materials that can be used as adsorbents when these methods are adopted are summarized,and the advantages and disadvantages of various adsorbents are summarized.A summary was made,and the application prospects of alkaline earth metal CaO adsorbents and their alkali metal-based adsorbents in the field of CO_(2)emissions were prospected.