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首页> 外文期刊>RSC Advances >Heterogeneous catalysis of transesterification of jatropha curcas oil over calcium-cerium bimetallic oxide catalyst
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Heterogeneous catalysis of transesterification of jatropha curcas oil over calcium-cerium bimetallic oxide catalyst

机译：麻疯树油在钙-铈双金属氧化物催化剂上的非均相催化酯交换反应

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摘要

A series of heterogeneous basic catalysts (mixed oxides of Ca and Ce) with different molar ratios were synthesized via a conventional co-precipitation process using a highly alkaline carbonate salt. Moreover, investigation was conducted batchwise for the transesterification of crude Jatropha curcas oil (JCO) with methanol at 65 degrees C and 1 atm pressure. The bimetallic oxides possess high thermal stability, since X-ray diffraction (XRD) proved that the crystalline phases present in mixed oxide catalysts were preserved well as pure oxide even up to 900 degrees C. The co-precipitation synthesis method provided better interaction between vacancies created by the substitution of calcium (Ca) and cerium (Ce) at pH 11. Moreover, the combination of Ca and Ce reduced the temperature maxima and increased the basicity of catalysts, which exhibited better catalytic activity compared with bulk catalysts (CaO and CeO2). The influences of the Ca/Ce atomic ratio in the mixed oxide catalyst, methanol-oil molar ratio, catalyst amount and reaction time on the fatty acid methyl ester (FAME) content were studied. The suitable molar ratio of Ca-to-Ce was 1, and with the optimum conditions of 4 wt% catalyst dosage and 15% methanol-oil molar ratio, a fatty acid methyl ester (FAME) content of 95% was achieved over CaO-CeO2 catalyst at 65 degrees C. Moreover, the CaO-CeO2 catalyst shows substantial chemical stability and could be reused at least 4 times without major loss in its catalytic activity.
机译：使用高碱性碳酸盐通过常规的共沉淀工艺合成了一系列摩尔比不同的多相碱性催化剂（Ca和Ce的混合氧化物）。此外，在65摄氏度和1个大气压下分批进行了麻疯树粗麻油（JCO）与甲醇的酯交换研究。双金属氧化物具有很高的热稳定性，因为X射线衍射（XRD）证明混合氧化物催化剂中存在的晶相甚至在900摄氏度以下也能很好地保存为纯氧化物。共沉淀合成方法提供了更好的空位相互作用通过在pH值为11时取代钙（Ca）和铈（Ce）产生。此外，Ca和Ce的组合降低了温度最大值并增加了催化剂的碱度，与本体催化剂（CaO和CeO2 ）。研究了复合氧化物催化剂中Ca / Ce原子比，甲醇-油摩尔比，催化剂用量和反应时间对脂肪酸甲酯（FAME）含量的影响。 Ca-Ce的合适摩尔比为1，在4 wt％催化剂用量和15％甲醇-油摩尔比的最佳条件下，相对于CaO-Ce，脂肪酸甲酯（FAME）含量达到95％ CeO2催化剂在65摄氏度。此外，CaO-CeO2催化剂显示出实质的化学稳定性，可以重复使用至少4次，而其催化活性不会受到重大损失。

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