Preparation, application, and optimization of Zn/Al complex oxides for biodiesel production under sub-critical conditions.
Preparation, application, and optimization of Zn/Al complex oxides for biodiesel production under sub-critical conditions.
复制标题
DOI：
10.1016/j.biotechadv.2010.05.011
复制
发表时间：
2010-09
影响因子：
16
通讯作者：
Wei Jiang;Houfang Lu;Tao Qi;S. Yan;Bin Liang
中科院分区：
文献类型：
--
作者：
Wei Jiang;Houfang Lu;Tao Qi;S. Yan;Bin Liang
酯交换法生产的生物柴油是一种很有前途的绿色燃料。制备了一种用于生物柴油制备的新型多相催化剂Zn/Al复合氧化物。结果表明，由锌/铝原子比为3.74：1的类水滑石前驱体衍生的催化剂在450°C下煅烧得到最高转化率84.25%。XRD、XPS、FI-IF、TG-DTA、BET分析和碱度测试表明，正是类水滑石化合物前驱体的独特结构使催化剂具有大于11.1的高碱度。Zn/Al复合氧化物的最佳反应条件为甲醇亚临界条件：200°C，2.5MPa，催化剂用量1.4%（wt），醇油比24：1。在此条件下，反应90 min，转化率达到84.25%，优于Mg/Al复合氧化物。当油脂原料中游离脂肪酸含量小于6%或含水量小于10%时，转化率大于80%，表现出优异的耐水性和耐游离脂肪酸性。
Biodiesel produced by transesterification is a promising green fuel in the future. A new heterogeneous catalyst, Zn/Al complex oxide, was prepared for biodiesel production. The results showed that the catalyst derived from a hydrotalcite-like precursor with a zinc/aluminum atom ratio of 3.74:1 and calcined at 450°C gave the highest conversion of 84.25%. Analysis of XRD, XPS, FI-IF, TG-DTA, BET and alkalinity tests demonstrated that it is the unique structure of hydrotalcite-like compound precursor that gave the catalyst a high alkalinity greater than 11.1. The optimal reaction condition for Zn/Al complex oxide was under methanol sub-critical condition: 200°C, 2.5MPa, 1.4% (wt) catalyst dosage, and 24:1 methanol to oil ratio. Under these conditions, the conversion reached 84.25% after 90min, which was better than Mg/Al complex oxides. The excellent tolerance to water and free fatty acid was exhibited when the oil feed had fewer than 6% FFA or 10% water content with a conversion greater than 80%.