Li Ya, Jiang Yunxia
Nantong College of Science and Technology Nantong 226007 PR China
RSC Adv. 2018 Apr 30;8(29):16013-16018. doi: 10.1039/c8ra02713g. eCollection 2018 Apr 27.
This study aimed to explore base catalysts with high transesterification efficiencies to be used for heterogeneous biodiesel production. Palygorskite, a promising low-cost clay mineral, served as a support for KF/CaO to prepare a base catalyst. The base catalyst was prepared a facile impregnation method and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), and N adsorption. Subsequently, the prepared catalyst was used for producing biodiesel the transesterification of commercial soybean oil with methanol. The effects of the catalyst preparation conditions as well as the transesterification parameters, such as the loading amount of KF, calcination temperature, catalyst amount, methanol to oil molar ratio, reaction temperature and water content, on the biodiesel yield were investigated. Results showed that the metal oxide species dispersed on the surface of palygorskite, and the formed KCaF was the main active component for the activity of the catalyst. A maximum biodiesel yield of 97.9% was obtained under the optimal conditions. The separated catalyst could be directly used in the next round of reactions and gave a satisfactory yield. The biodiesel yields decreased from 97.9% to 91.3% from the first to the tenth use of the catalyst particles.
本研究旨在探索具有高酯交换效率的碱催化剂，用于非均相生物柴油生产。坡缕石是一种很有前景的低成本粘土矿物，用作KF/CaO的载体以制备碱催化剂。该碱催化剂采用简便的浸渍法制备，并通过X射线衍射（XRD）、带能谱仪（EDS）的扫描电子显微镜（SEM）和N吸附进行表征。随后，将制备的催化剂用于通过商业大豆油与甲醇的酯交换反应生产生物柴油。研究了催化剂制备条件以及酯交换参数，如KF负载量、煅烧温度、催化剂用量、甲醇与油的摩尔比、反应温度和含水量对生物柴油产率的影响。结果表明，金属氧化物物种分散在坡缕石表面，形成的KCaF是催化剂活性的主要活性成分。在最佳条件下获得了97.9%的最高生物柴油产率。分离出的催化剂可直接用于下一轮反应，并给出了令人满意的产率。从第一次使用到第十次使用催化剂颗粒，生物柴油产率从97.9%降至91.3%。
