Preparation of aluminum fumarate microsphere (mAlFu) adsorbent and its CO2 adsorption characteristic
ZHAO Xingxing,DING Yudong,LIU Qiwei,ZHU Xun,WANG Hong,LIAO Qiang
CO2大量排放是造成全球气候变化的主要原因,减少CO2排放成为全球共识。多孔材料具有较高的CO2吸附能力、更高的效率和较低的再生能耗,是一种被认为可以取代当前液氨法捕集CO2的有效方案。因此开发化学稳定,高CO2吸附容量,成本低的吸附剂是多孔材料应用的关键。富马酸铝吸附剂因其高的比表面积,气体吸附能力在气体分离领域具有较大的应用潜力。为了简化富马酸铝的合成步骤,本项研究以富马酸二钠作为连接源,九水合硝酸铝作为金属源,在室温下快速合成富马酸铝MOF(mAlFu)微球吸附剂,并用于CO2吸附。扫描电镜(SEM)、X射线衍射(XRD)、红外光谱(FT-IR)等表征结果显示成功合成了类微球型mAlFu吸附剂。热重分析显示该吸收剂分解温度为400 ℃,具有较高的热稳定性。孔径分析结果表明:mAlFu吸附剂具有发达的孔道结构。研究mAlFu对CO2的吸附性能,结果表明在303 K,100 kPa条件下,mAlFu的CO2吸收量为2.21 mmol/g。通过构建的mAlFu的构象,基于蒙特卡洛法(GCMC)获得mAlFu的吸附量,通过对比实验值与计算值,结果表明选取模拟参数的计算方法可以用于计算mAlFu的气体吸附。同时计算获得烟气条件下的mAlFu吸附剂的CO2选择性,值为14。循环再生性能表明:mAlFu的CO2吸附能力保持稳定,证明mAlFu吸附剂在CO2捕集领域具有较大的应用潜力。
CO2 emissions are the main cause of global climate change and reducing CO2 emissions is being a global consensus. Porous materials,which with higher CO2 adsorption capacity,higher capture efficiency and lower regeneration energy consumption,are considered an effective method to replace the liquid ammonia method for CO2 capture. It is the key to develop porous materials with the chemically stable,high CO2 adsorption capacity and low-cost in the application of porous materials. Aluminum fumarate (AlFu) adsorbent has shown a great application potential in gas separation owing to high specific-surface area and gas adsorption capacity. In present work,in order to simplify the synthesis steps of aluminium fumarate,disodium fumarate as the linker and aluminium nitrate as the metal source were used to synthesis microsphere-like Al-Fumarate MOF (mAlFu) at room temperature CO2 adsorption. The as-synthesized material was characterized by the Scan Electron Microscopy (SEM),X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR),all the results showed that the synthesized product was mAlFu adsorbent. Thermo gravimetric analysis (TGA) showed that the decomposition temperature of the mAlFu sorbents was 400 ℃,which had high thermal stability. The pore size analysis showed that mAlFu adsorbent had abundant pores. At the same time,the CO2 adsorption performance of mAlFu was investigated,the CO2 uptake of mAlFu was 2.21 mmol/g at 303 K,0.1 MPa. The constructed conformation of mAlFu was used to compute the CO2 adsorption of mAlFu based on the Monte Carlo (GCMC) method. By comparing the experimental and calculated values,the results show that the method of calculating parameters could be used to predict the gas adsorption of mAlFu. Meanwhile,the CO2 selectivity of mAlFu adsorbent was obtained in flue gas,which value was 14. The CO2 cylic regeneration performance of mAlFu had showed the CO2 adsorption capacity remained stable,indicating the sorbents had great potential for CO2 capture.
Aluminum fumarate microsphere sorbents; GCMC; CO2 adsorption simulation; CO2 adsorption experiment; cylic regeneration
主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会