Novel M (Mg/Ni/Cu)-Al-O-3 layered double hydroxides synthesized by aqueous miscible organic solvent treatment (AMOST) method for CO2 capture
Novel M (Mg/Ni/Cu)-Al-O-3 layered double hydroxides synthesized by aqueous miscible organic solvent treatment (AMOST) method for CO2 capture
复制标题
水相混溶有机溶剂处理（AMOST）方法合成新型M（Mg/Ni/Cu）-Al-O-3层状双氢氧化物用于CO2捕获
DOI：
10.1016/j.jhazmat.2019.03.077
复制
发表时间：
2019
影响因子：
13.6
通讯作者：
Shang Jin
中科院分区：
文献类型：
--
作者：
Shang Shanshan;Hanif Aamir;Sun Mingzhe;Tian Yuanmeng;Ok Yong Sik;Yu Iris K M;Tsang Daniel C W;Gu Qinfen;Shang Jin
层状双氢氧化物（LDHs）由于其在CO2捕集方面的巨大潜力，近年来得到了广泛的研究。然而，严重的血小板聚集和低的比表面积限制了它表现出很高的CO2吸附容量和CO2/N2选择性。本研究首次采用水溶性有机溶剂处理法（AMOST）合成了Ni-Al-CO 3和Cu-Al-CO 3 LDHs。在适用于燃烧后CO2捕集的三种不同温度（50、80、120 °C）下评价合成材料的CO2吸附。通过XRD、N2吸附-脱附、TEM、EDX和TGA等手段对合成的Ni-Al-CO 3 LDH进行表征，发现其具有高比表面积（249.45 m2/g）和高孔容（0.59 cc/g）的纳米花状形貌，由随机排列的二维纳米片组成。实验结果表明，未煅烧的Ni-Al-CO 3 LDH具有上级的CO2捕集性能，在50 °C、1200 mbar条件下，对典型的烟气CO2/N2组成（CO2：N2= 15：85，v/v），最大CO2吸附容量为0.87 mmol/g，理想的CO2/N2选择性为166。这是首次报道的分层Ni-Al-CO 3 LDH表现出更好的CO2捕获性能比已报道的最佳Mg层状双氢氧化物。
Layered double hydroxides (LDHs) have been intensively studied in recent years owing to their great potential in CO2capture. However, the severe aggregation between platelets and low surface area restricted it from exhibiting very high CO2adsorption capacity and CO2/N2selectivity. In this research, we for the first time synthesized Ni-Al-CO3and Cu-Al-CO3LDHs using aqueous miscible organic solvent treatment (AMOST) method. The as-synthesized materials were evaluated for CO2adsorption at three different temperatures (50, 80, 120 °C) applicable to post-combustion CO2capture. Characterized with XRD, N2adsorption-desorption, TEM, EDX, and TGA, we found the newly synthesized Ni-Al-CO3LDH showed a nano-flower-like morphology comprising randomly oriented 2D nanoplatelets with both high surface area (249.45 m2/g) and pore volume (0.59 cc/g). Experimental results demonstrated that un-calcined Ni-Al-CO3LDH is superior in terms of CO2capture among the three LDHs, with a maximum CO2adsorption capacity of 0.87 mmol/g and the ideal CO2/N2selectivity of 166 at 50 °C under 1200 mbar for typical flue gas CO2/N2composition (CO2:N2= 15:85, v/v). This is the first report of a delaminated Ni-Al-CO3LDH showing better CO2capture performance than the well-reported optimal Mg layered double hydroxide.