负载型NaOH/蒙脱石固体碱催化剂的制备及在生物柴油中的应用

多相催化生产生物柴油因其环境友好和经济效益突出而成为研究热点.以高纯蒙脱石为原料,用HCl酸化制得活性白土,再用Ca(OH)2改性,制备出具有阴离子交换性的碱性蒙脱石,然后负载NaOH制备蒙脱石固体碱催化剂,并将其用于制备生物柴油的酯交换反应.结果表明,在m(NaOH)∶m(碱性蒙脱石)=0.7、负载时间18 h和碱性...

Preparation of supported NaOH/montmorillonite solid base catalyst and its application for biodiesel synthesis

The hotspots due to obtained by aci production technology of biodiesel over heterogeneous catalysts become the research its environmental-benign process and great economic benefits. The activated clay was difying high purity montmorillonite with HCl. Supported NaOH/montmorillonite solid base catalyst was prepared by loading NaOH on alkaline montmorillonite which was abtained from activated clay modified by Ca （OH）2. The as-prepared solid base catalyst was used in the transesterification for biodiesel production. The results showed that the loading amount of NaOH on alkaline montmorillonite was 4.1 mmol·g^-1 under the condition as follows ： mass ratio of NaOH to alkaline montmorillonite 0.7, loading time 18 h,and OH^- content in alkaline montmorillonite 1.41 mmol ·g^-1. The transesterification conversion of soybean oil to biodiesel over the solid base catalyst reached 91.8% ; The catalyst exhibited better catalytic properties than KOH, and the advantages of easy recycle and less pollution for the environment.