Zhang Qiuyun, Ling Dan, Lei Dandan, Wang Jialu, Liu Xiaofang, Zhang Yutao, Ma Peihua
School of Chemistry and Chemical Engineering, Anshun University, Anshun, China.
Engineering Technology Center of Control and Remediation of Soil Contamination of Provincial Science & Technology Bureau, Anshun University, Anshun, China.
Front Chem. 2020 Mar 18;8:129. doi: 10.3389/fchem.2020.00129. eCollection 2020.
In the present study, metal-organic framework Cu-BTC-supported Sn (II)-substituted Keggin heteropoly nanocomposite (SnPW/Cu-BTC) was successfully prepared by a simple impregnation method and applied as a novel nanocatalyst for producing biodiesel from oleic acid (OA) through esterification. The nanocatalyst was characterized by Fourier transform infrared spectrometry (FTIR), wide-angle X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption, thermogravimetrics (TG), and NH-temperature-programmed desorption (NH-TPD). Accordingly, the synthesized nanocatalyst with a SnPW/Cu-BTC weight ratio of 1 exhibited a relatively large specific surface area, appropriate pore size, and high acidity. Moreover, an OA conversion of 87.7% was achieved under optimum reaction conditions. The nanocatalyst was reused seven times, and the OA conversion remained at more than 80% after three uses. Kinetic study showed that the esterification reaction followed first-order kinetics, and the activation energy ( ) was calculated to be 38.3 kJ/mol.
在本研究中，通过简单的浸渍法成功制备了金属有机框架Cu - BTC负载的Sn（II）取代的Keggin杂多纳米复合材料（SnPW/Cu - BTC），并将其用作通过酯化反应由油酸（OA）生产生物柴油的新型纳米催化剂。通过傅里叶变换红外光谱（FTIR）、广角X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、氮吸附 - 脱附、热重分析（TG）和NH3程序升温脱附（NH3 - TPD）对该纳米催化剂进行了表征。因此，合成的SnPW/Cu - BTC重量比为1的纳米催化剂表现出相对较大的比表面积、合适的孔径和高酸度。此外，在最佳反应条件下，油酸转化率达到了87.7%。该纳米催化剂重复使用了七次，三次使用后油酸转化率仍保持在80%以上。动力学研究表明，酯化反应遵循一级动力学，计算得出的活化能（ ）为38.3 kJ/mol。
