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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >A facile synthesis strategy for structural property control of mesoporous alumina and its effect on catalysis for biodiesel production
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A facile synthesis strategy for structural property control of mesoporous alumina and its effect on catalysis for biodiesel production

机译：介孔氧化铝结构性质控制的简便合成策略及其对生物柴油生产催化的影响

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摘要

A facile synthesis route for the production of mesoporous alumina (MA) with tuneable structural properties including BET surface area, pore volume and pore size was systematically investigated by tailoring the amount of template P123 used in the synthesis. The general synthesis strategy was based on a sol-gel process by hydrolysis of aluminium isopropoxide associated with nonionic block copolymer (P123) as the template in a water system. The results showed that the addition of P123 played a crucial role in the synthesis process, leading to very regular variations in the surface area (146.6-261.6 m~2/g), pore volume (0.164-2.152 cm~3/g) and pore size (3.5-29.9 nm). MA-supported K species (MA-K) were prepared using KNO3 as the potassium precursor and adopted as the catalysts for biodiesel production. The introduction of K species to MA caused a reduction in the BET surface area and pore volume, but gave rise to a significant increase in pore size, especially when the K species was higher than 10%. K incorporation resulted in the formation of disordered, but significantly larger mesopores. In catalysis, by introducing 20% molar fraction of K species to MA, very high yield of biodiesel was achieved (92.2%) and further increased to 94.4% with 25% K. Based on the control of structural properties of MA, a series of MA-20K catalysts with the same K loading (20%) but different structural properties were prepared by varying P123 addition and were further tested in biodiesel synthesis. Higher biodiesel yields were obtained over the MAs with higher surface area, pore volume and bigger pore size, which were attributed to the reduced mass transfer limitation in catalysis.
机译：通过调整合成中使用的模板P123的量，系统地研究了生产具有可调结构特性（包括BET表面积，孔体积和孔径）的介孔氧化铝（MA）的简便合成路线。通用合成策略基于溶胶-凝胶工艺，该工艺通过水解与非离子嵌段共聚物（P123）相关的异丙醇铝作为模板在水系统中进行。结果表明，P123的添加在合成过程中起着至关重要的作用，导致表面积（146.6-261.6 m〜2 / g），孔体积（0.164-2.152 cm〜3 / g）和孔径（3.5-29.9 nm）。以KNO3为钾前体制备了MA支撑的K物种（MA-K），并将其用作生物柴油生产的催化剂。向MA中引入K物质导致BET表面积和孔体积的减少，但导致孔径显着增加，尤其是当K物质高于10％时。钾的掺入导致无序但明显更大的中孔的形成。在催化过程中，通过向MA中引入20％的摩尔比的K物种，可实现很高的生物柴油收率（92.2％），并在25％K的情况下进一步提高到94.4％。通过改变P123的添加量来制备具有相同的K负载量（20％）但结构性质不同的MA-20K催化剂，并在生物柴油合成中进行了进一步测试。在具有较高表面积，孔体积和较大孔径的MA上获得了更高的生物柴油产率，这归因于催化过程中传质限制的降低。

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