一种Fe-MOF(FeBTB,BTB=4,4′,4″-苯-1,3,5-三-苯甲酸)的低温热容探究

Study on Low Temperature Heat Capacity of an Iron-based Metal-Organic Framework Compound,FeBTB(BTB=4,4′,4″-Benzene-1,3,5-Triyl-Tribenzoate)

金属有机骨架化合物具有高表面积与多孔性特征,因而拥有良好的吸附性能。通过溶剂热法合成了一种金属有机骨架化合物FeBTB(BTB=4,4′,4″-苯-1,3,5-三-苯甲酸)。借热重分析(TG)和差示扫描量热法(DSC)可研究FeBTB的热力学性质。对FeBTB热容的测量值和温度进行了拟合,推导出热容与折合温度的多项式,并计算出FeBTB在298.15 K时的热容为441.0 J·K-1·mol-1;同时计算出其在该温度下的焓和熵。经DSC分析测出FeBTB的相变温度、相变焓和熵。

Metal-organic framework compounds have characteristics of high surface area and porosity,so they have excellent adsorption.In this paper,metal-organic framework compound FeBTB(BTB=4,4′,4″-benzene-1,3,5-triyl-tribenzoate) was synthesized by solvothermal reaction.The thermodynamic characteristics of FeBTB were tested by thermogravimetry(TG) and differential scanning calorimetry(DSC).According to the testing heat capacity of FeBTB at different temperatures,a polynomial for heat capacity and reduced temperature,Cp,m-t was derived;and the calculation result of FeBTB heat capacity was 441.0 J·K-1·mol-1 at 298.15 K;the corresponding enthalpy and entropy at the same temperature were also calculated.Phase transition temperature,phase change enthalpy and entropy were determined by DSC analysis.