Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.
Bioresour Technol. 2013 Jan;128:305-9. doi: 10.1016/j.biortech.2012.10.152. Epub 2012 Nov 7.
A solid Ca/Al composite oxide-based alkaline catalyst containing Ca(12)Al(14)O(33) and CaO was prepared by chemical synthesis and thermal activation from sodium aluminate solution and calcium hydroxide emulsion. The effect of calcination temperatures ranging from 120 °C to 1000 °C on activity of the catalyst was investigated. The catalyst calcined at 600 °C showed the highest activity with >94% yield of fatty acid methyl esters (i.e. biodiesel) when applied to the transesterification of rapeseed oil at a methanol:oil molar ratio of 15:1 at 65 °C for 3h. Structure and properties of the catalyst were studied and the characterizations with XRD, TGA, FTIR, BET, and SEM demonstrated that the performance of the catalyst was closely related to its specific surface area and crystalline structure. In particular, the generation of crystalline Ca(12)Al(14)O(33) improved the catalytic activity due its synergistic effect with CaO.
一种基于 Ca/Al 复合氧化物的碱性催化剂，含有 Ca(12)Al(14)O(33)和 CaO，由铝酸钠溶液和氢氧化钙乳液通过化学合成和热激活制备而成。考察了煅烧温度（120°C 至 1000°C）对催化剂活性的影响。当应用于在 65°C 下甲醇：油摩尔比为 15:1 的条件下，3 小时的油菜籽油酯交换反应时，在 600°C 下煅烧的催化剂表现出最高的活性，脂肪酸甲酯（即生物柴油）的产率超过 94%。研究了催化剂的结构和性能，XRD、TGA、FTIR、BET 和 SEM 的特性表明，催化剂的性能与其比表面积和结晶结构密切相关。特别是，结晶 Ca(12)Al(14)O(33)的生成由于与 CaO 的协同作用提高了催化活性。
