摘要
高温条件下固相CaO可直接与CO_(2)反应生成CaCO_(3),CO_(2)捕集率达78.57%(质量分数),是解决碳排放的高效手段。钙循环技术中如何降低CaCO_(3)分解温度、CaO再生和CO_(2)利用是关键问题。研究通过纳米CaCO_(3)和碳粉的低热固固耦合反应同时实现纳米CaO再生和CO_(2)原位转化为CO,使纳米CaCO_(3)分解温度下降46℃,分解速率提高约50%,再生的多孔纳米CaO粒径小而均匀,可再次捕集CO_(2)实现钙循环利用,由CO_(2)转化的CO可应用于工业合成气。纳米CaCO_(3)和碳粉具有原料来源广泛、价格低廉、安全性高、运输便捷等优点,该低热固固耦合反应在低成本前提下具有提高CO_(2)捕集和利用效率的潜力。
At high temperatures,solid-phase CaO can directly react with CO_(2),achieving a capture rate of 78.57 wt%and serving as an efficient means to address carbon emissions.Key challenges in calcium looping technology include reducing the decomposition temperature of CaCO_(3),regenerating CaO,and efficiently utilizing CO_(2).In this study,a low thermal solid-solid coupling reaction between nano-CaCO_(3) and carbon powder was employed to simultaneously regenerate nano-CaO and convert CO_(2) in-situ to CO.This process led to a 46℃reduction in the decomposition temperature of nano-CaCO_(3),accompanied by an approximately 50%increase in decomposition rate.The regenerated porous nano-CaO exhibited small and uniform particle size,facilitating its reuse for CO_(2) capture and achieving calcium looping utilization.The CO produced from the conversion of CO_(2) can be applied in industrial syngas synthesis.Nano-CaCO_(3) and carbon powder offer advantages such as wide availability,low cost,high safety,and convenient transportation.The low thermal solid-solid coupling reaction holds the potential to enhance CO_(2) capture and utilization efficiency under the premise of low cost.
作者
陆子煊
叶献民
蔡正宇
张冰姿
唐美
LU Zixuna;YE Xianmin;CAI Zhengyu;ZHANG Bingzi;TANG Mei(School of Physical Science and Technology,Guangxi University,Nanning 330100,China;School of Materials and Chemistry,China Jiliang University,Hangzhou 310018,China;Saxo Fintech Business School,University of Sanya,Sanya 572022,China;Ecology and Health Institute,Hangzhou Vocational&TechnicalCollege,Hangzhou 310018,China)
出处
《功能材料》
CAS
CSCD
北大核心
2024年第6期6218-6223,共6页
Journal of Functional Materials
基金
国家自然科学基金项目(51502044)。
