SMALL-PORE MOLECULAR-SIEVES SAPO-34 AND SAPO-44 WITH CHABAZITE STRUCTURE - A STUDY OF SILICON INCORPORATION
SMALL-PORE MOLECULAR-SIEVES SAPO-34 AND SAPO-44 WITH CHABAZITE STRUCTURE - A STUDY OF SILICON INCORPORATION
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DOI：
10.1021/j100069a018
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发表时间：
1994-05-05
影响因子：
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通讯作者：
CHAKRABARTY, DK
中科院分区：
文献类型：
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作者：
ASHTEKAR, S;CHILUKURI, SVV;CHAKRABARTY, DK
合成了两种不同硅含量的小孔硅取代分子筛SAPO-34和SAPO-44，并用XRD、SEM、FT-IR和热分析对其进行了表征。它们的酸度是通过程序升温解吸氨来定量测定的。这些研究结果以及固态MAS NMR结果表明，大部分硅取代了结构中孤立的磷原子，而少量硅形成了小的硅斑。这种小斑块的形成程度在SAPO-34中比在SAPO-44中更为明显。
Two small-pore silicon-substituted molecular sieves SAPO-34 and SAPO-44 with varying amount of silicon have been synthesized and characterized by XRD, SEM, FT-IR spectroscopy, and thermal analyses. Their acidity has been measured quantitatively by temperature-programmed desorption of ammonia. The results of these studies along with solid-state MAS NMR results show that the major part of silicon substitutes isolated phosphorus atoms in the structure whereas some amount of it forms small silica patches. The extent of formation of such small patches is more noticeable in SAPO-34 than in SAPO-44.