新型花生壳生物炭基催化剂催化酯交换反应

NOVEL PEANUT SHELL BIOCHAR SUPPORTED CATALYST FOR TRANSESTERIFICATION REACTION

以固体废弃物花生壳为原料,制备一系列固体碱复合催化剂,并应用于酯交换反应实验。催化剂的表征通过扫描电子显微镜(SEM)、X射线能谱(EDS)、X-射线衍射(XRD)、N2吸脱附(BET)、傅里叶变换红外光谱(FTIR)及Hammett指示法进行检测。同时对催化剂的制备条件、催化反应条件及重复利用进行分析。实验结果表明:催化剂30K/PB-600具有优良的催化剂活性,在最佳反应条件下(6%的催化剂用量,7∶1的醇油物质量比和150 min的反应时间)生物柴油的产率可达96.3%;经过8次循环利用后产率仍大于82%,催化剂的失活是由于少量K+的流失。

The peanut shell is utilized as the raw material for the preparation of cost-effective and high-efficiency solid base catalysts for the transesterification reaction.The chemical and structural properties of catalysts are examined by scanning electron microscope(SEM),energy dispersive spectrometer(EDS),X-ray diffraction(XRD),N2 adsorption/desorption,Fourier-transform infrared spectroscopy(FTIR)and the Hammett indicator method.In addition,the effects of catalyst preparation conditions,reaction conditions and the catalyst reusability are studied.The best performance is observed for the resulting 30K/PB-600 catalyst,and over biodiesel yield of 96.3% is achieved at catalyst amount of 6%,methanol/oil molar ratio of 7∶1 and reaction time of 150 min.After 8 repeated use,only a slight deactivation is found(above 82% of yield obtained)due to K+ions leached into reaction media.