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首页> 外文期刊>Journal of Materials Research >Porous AI_2O_3/AI catalyst supports fabricated by an Al(OH)_3/AI mixture and the effect of agglomerates
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Porous AI_2O_3/AI catalyst supports fabricated by an Al(OH)_3/AI mixture and the effect of agglomerates

机译：Al（OH）_3 / AI混合物制备的多孔AI_2O_3 / AI催化剂载体及附聚物的影响

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摘要

Porous A1_2O_3/A1 catalyst supports were fabricated using a mixture of A1(OH)_3 and Al powders, followed by pressureless sintering at a temperature of 600 deg C in vacuum. Different pressures were used to prepare green compacts. High compaction pressure led to a high surface area and good mechanical and electrical properties for the sintered specimens. However, when the Al content in the sintered specimen exceeded a definite value, high compaction pressure decreased the surface area abruptly. Scanning electron microscopy observations revealed that agglomeration in the starting mixture has a significant effect on the microstructure of the sintered specimens. High compaction pressure greatly eliminated the agglomerates and led to a uniform microstructure for the sintered specimens. However, when the Al content in the starting mixture was too high, Al particles in the compacts prepared by the high pressure were largely sintered due to the high compact density so that most of the pores were closed. The present study indicates that a suitable compaction pressure is critical to obtaining superior A1_2O_3/A1 supports.
机译：使用Al（OH）_3和Al粉的混合物制备多孔的Al_2O_3 / Al催化剂载体，然后在真空中于600摄氏度的温度下进行无压烧结。使用不同的压力来制备生坯。高的压制压力导致了烧结样品的高表面积以及良好的机械和电性能。然而，当烧结样品中的Al含量超过确定值时，高的压制压力突然减小了表面积。扫描电子显微镜观察表明，起始混合物中的团聚对烧结样品的微观结构有重大影响。高压实压力极大地消除了附聚物，并导致了烧结试样的均匀微观结构。然而，当起始混合物中的Al含量太高时，由于高的压坯密度，通过高压制备的压坯中的Al颗粒被大量烧结，从而大部分孔被封闭。本研究表明，合适的压实压力对于获得优质的A1_2O_3 / A1支撑至关重要。

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