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首页> 外文期刊>Journal of Materials Research >New insights on the basicity of ZnAl-Zr hydrotalcites activated at low temperature and their application in transesterification of soybean oil
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New insights on the basicity of ZnAl-Zr hydrotalcites activated at low temperature and their application in transesterification of soybean oil

机译：低温活化的ZnAl-Zr水滑石的碱性及其在大豆油酯交换反应中的应用的新见解

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摘要

ZnAl-Zr(X) hydrotalcite-like materials were synthesized by co-precipitation using a Zn/Al molar ratio of 2 and Zr/Al(X) molar ratios of 0.0, 0.10, and 0.25. The effect of the activation temperature on the catalytic performance of these materials was analyzed, revealing that at relatively low temperature (200 degrees C), the collapse of the material structure is diminished, leading to FAME yields varying from 68 to 82%. This remarkable catalytic activity is related to the formation of hydrotalcite, zincite, and hydrozincite which in turn lead to the generation of Bronsted basic sites and Lewis acid-basic pairs. Incorporation of Zr+4 into the brucite-like structure of hydrotalcites enhances the basicity of ZnAl-Zr(X) catalysts, which correlates well with the increase in catalytic activity observed for these catalysts. The stability of the ZnAl-Zr (0.25) catalyst was further studied, showing insignificant deactivation after five subsequent reaction cycles. A simplified reaction scheme was proposed for the transesterification reaction over these materials.
机译：通过共沉淀使用2的Zn / Al摩尔比和0.0、0.10和0.25的Zr / Al（X）摩尔比共沉淀合成ZnAl-Zr（X）水滑石类材料。分析了活化温度对这些材料的催化性能的影响，发现在相对较低的温度（200摄氏度）下，材料结构的崩溃减少了，导致FAME产率从68％到82％不等。这种显着的催化活性与水滑石，锌矿和水锌矿的形成有关，反过来又导致了布朗斯台德碱性位点和路易斯酸碱对的生成。将Zr + 4掺入水滑石的水镁石状结构中可增强ZnAl-Zr（X）催化剂的碱性，这与这些催化剂所观察到的催化活性的提高非常相关。进一步研究了ZnAl-Zr（0.25）催化剂的稳定性，显示在五个随后的反应循环后失活不明显。提出了在这些材料上进行酯交换反应的简化反应方案。

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