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| 表面改性氧化钙高效催化菜籽油制备生物柴油 |
| Biodiesel production from rapeseed oil catalyzed by surfacely modified calcium oxide efficiently |
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| DOI： |
| 中文关键词: 溴代正丁烷 氧化钙 改性 催化 菜籽油 生物柴油 |
| 英文关键词:n-butyl bromide calcium oxide modification catalysis rapeseed oil biodiesel |
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| 中文摘要: |
| 以溴代正丁烷作为改性剂，采用化学键合法对氧化钙进行表面改性，用傅里叶红外光谱（FT-IR）和X-射线衍射（XRD）对改性氧化钙进行了表征,并以此为催化剂催化菜籽油与甲醇酯交换反应制备生物柴油。结果表明，氧化钙表面改性后能够促进反应物向催化剂表面的扩散，提高催化剂的催化效率。在反应温度65℃、溴代正丁烷改性剂用量0.01%(占氧化钙物质的量）、醇油摩尔比15∶1、催化剂用量5%、反应时间3 h条件下，生物柴油产率可达96.6%，而相同条件下未改性氧化钙催化制备生物柴油产率只有89.3%。同时，经过改性后的氧化钙还具有良好的耐水性，在体系含水量为2.0%的条件下仍能保持79.1%的生物柴油产率。FT-IR、XRD表征结果表明，溴代正丁烷改性剂已经化学键合到氧化钙表面，并且改性对氧化钙物相结构以及分散状态影响不明显。 |
| 英文摘要: |
| Using n-butyl bromide as modifier, calcium oxide was surfacely modified by chemical bonding method. The characterizations of modified calcium oxide were determined by FT-IR and XRD. Then biodiesel was prepared by transesterification of rapeseed oil and methanol with modified calcium oxide as catalyst. The results showed that the catalytic performance of modified calcium oxide improved greatly contributing to well diffusion of reactants to the surface of catalyst and the catalytic efficiency was enhanced.The optimal reaction conditions were obtained as follows: reaction temperature 65℃, dosage of n-butyl bromide 0.01% (based on the amount of substance of calcium oxide), molar ratio of methanol to rapeseed oil 15∶1, catalyst dosage 5% and reaction time 3 h. Under these conditions, the yield of biodiesel could reach 96.6%.While the yield of biodiesel was only 89.3% with calcium oxide as catalyst under the same conditions. Furthermore, the modified calcium oxide showed good water-resistance by keeping 79.1% of biodiesel yield with 2.0% water in the reaction system. The characterization results of FT-IR and XRD showed that the modifier had bonded on the surface of calcium oxide, and the phase structure and dispersion state of modified calcium oxide didnt change obviously. |
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