Synthesis of SAPO-34 Molecular Sieves Templated with Diethylamine and Comparison with Other Templates

doi:10.1016/S1872-2067(11)60325-2

Abstract

Abstract: SAPO-34 molecular sieves were synthesized using diethylamine (DEA) as a template. Influencing factors, such as H₃PO₄ content, H₂O content, Al source, and Si source, were investigated. Pure SAPO-34 could be obtained under the following synthesis gel conditions: 0.7 ≤ n(P₂O₅)/n(Al₂O₃) ≤ 1.2 and 25 ≤ n(H₂O)/n(Al₂O₃) ≤ 100. The Al source has a great influence on the resulting sample composition. SAPO-34 could also be synthesized using triethylamine (TEA), morpholine (MOR), and a DEA-TEA mixture as template, respectively. The products were characterized using X-ray diffraction, X-ray fluorescence, scanning electron microscopy, thermogravimetry, and ²⁹Si MAS NMR. The level of silicon incorporation into the SAPO-34 framework decreased in the following order of SAPO-34 (DEA) > SAPO-34 (MOR) > SAPO-34 (TEA). The Si(4Al) contents in the SAPO-34 frameworks followed the order of SAPO-34 (DEA) ≈ SAPO-34 (MOR) > SAPO-34 (TEA).

Key words: SAPO-34, template, diethylamine, triethylamine, morpholine, synthesis

LIU Guang-Yu, TIAN Peng, LIU Zhong-Min. Synthesis of SAPO-34 Molecular Sieves Templated with Diethylamine and Comparison with Other Templates[J]. Chinese Journal of Catalysis, 2012, 33(1): 174-182.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(11)60325-2

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