Template-free synthesis of AlPO₄-H1, -H2, and -H3 by microwave heating

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• 作者：Kunii ; Katsuyuki ; Narahara ; Kazuhiro ; Yamanaka ; Shoji
• 关键词：Microwave heating ; Template-free synthesis ; AlPO₄-H1 ; AlPO₄-H2(AHT) ; AlPO₄-H3(APC)
• 刊名：Microporous and Mesoporous Materials
• 出版年：2002
• 出版时间：May, 2002
• 年：2002
• 卷：52
• 期：3
• 页码：159-167
• 全文大小：251 K

文摘

Aluminophosphate molecular sieves (AlPO₄'s) were prepared by microwave heating without using organic template reagents. The microwave heating enhanced the crystallization of aluminophosphate gels, and AlPO₄-H1, -H2(AHT), and -H3(APC) were successfully obtained as single phases in a relatively short reaction time. The reaction conditions used for the crystallization of the three kinds of AlPO₄'s were very similar to each other, but the use of different aluminum sources resulted in different structures; amorphous aluminum hydroxide, gibbsite, and boehmite were used for the preparation of AlPO₄-H1, -H2, and -H3, respectively. The crystallization temperatures were 125, 118, and 90 °C, respectively. The addition of hydrochloric acid was needed for the crystallization of AlPO₄-H1 and -H2. The addition of seed crystals and stirring the gels were found to be essential for the crystallization of AlPO₄-H3. Nitrogen and water adsorption properties were also measured.