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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Formation of mesopores in USY zeolites: A case revisited
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Formation of mesopores in USY zeolites: A case revisited

机译:USY沸石中孔的形成:一个案例的回顾

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摘要

Steaming of NH4Y zeolite at 723 K and 873 K is accompanied by the formation of extra-framework amorphous aluminosilicate and silica gel in addition to earlier observed extra-framework aluminum species. Their occurrence is directly associated with the formation of mesopores. Bulk (intracrystalline) mesopores occur inside the crys- tallite nuclei and surface intercrystalline) mesopores are located nearby the crystallite surface. Corrosion of the zeolite framework results in a loss of crystallinity and, consequently, decreased catalytic activity of the USY catalysts synthesized. Analysis of the reasons of mesopore formation may help to reduce these disadvantages.
机译:NH4Y沸石在723 K和873 K汽化时,除了早期观察到的骨架外铝物种外,还形成骨架外无定形硅铝酸盐和硅胶。它们的出现与中孔的形成直接相关。大块(晶内)中孔出现在冰晶石核内部,表面晶间)中孔位于微晶表面附近。沸石骨架的腐蚀导致结晶度的损失,因此,合成的USY催化剂的催化活性降低。分析中孔形成的原因可能有助于减少这些缺点。

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