Solid acid catalyzed biodiesel production by simultaneous esterification and transesterification
Solid acid catalyzed biodiesel production by simultaneous esterification and transesterification
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DOI：
10.1039/b605713f
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发表时间：
2006-01-01
期刊：
影响因子：
9.8
通讯作者：
Dalai, Ajay Kumar
中科院分区：
文献类型：
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作者：
Kulkarni, Mangesh G.;Gopinath, Rajesh;Dalai, Ajay Kumar
12-将磷钨酸（TPA）浸渍在水合氧化锆、二氧化硅、氧化铝和活性炭等4种不同载体上，考察了TPA作为固体酸催化剂对低质量菜籽油（游离脂肪酸含量不超过20wt%）制备生物柴油的催化性能。水合氧化锆负载TPA被认为是最有前途的催化剂，表现出最高的酯产率（类似于77%）。FTIR、XRD和N2吸附分析表明，TPA与ZrO2表面羟基的强相互作用产生的刘易斯酸中心是其高活性的原因。此外，用最具活性的催化剂即TPA负载的水合氧化锆进行反应参数的优化，并且发现在200 ° C、1：9的油与醇摩尔比和3wt%的催化剂负载量下，可以获得90wt%的最大酯产率。催化剂被回收和重复使用，活性损失可以忽略不计。
12-Tungstophosphoric acid (TPA) impregnated on four different supports such as hydrous zirconia, silica, alumina and activated carbon was evaluated as solid acid catalysts for the biodiesel production from low quality canola oil containing upto 20 wt% free fatty acids. The hydrous zirconia supported TPA was found to be the most promising catalyst exhibiting the highest ester yield (similar to 77%). The FTIR, XRD and nitrogen adsorption analysis revealed that the Lewis acid sites generated by the strong interaction of TPA and surface hydroxyl groups of zirconia are responsible for their higher activity. Further, the optimization of reaction parameters was carried out with the most active catalysts i.e. TPA supported hydrous zirconia and it was found that at 200 degrees C, 1:9 oil to alcohol molar ratio and 3 wt% catalysts loading a maximum ester yield of 90 wt% could be obtained. The catalysts were recycled and reused with negligible loss in activity.