Two-dimensional ultra-thin Me-SAPO-34 molecular sieve thin-sheet material and preparation method thereof

Abstract

The invention discloses a two-dimensional ultra-thin Me-SAPO-34 (ME: Fe, Co or Ni) molecular sieve thin-sheet material, which has the thickness of 1-30 nanometers and a crystal structure of SAPO-34 molecular sieve, wherein the silicon / aluminum atomic ratio is 0.15-0.25, and the mass content of metal ion Me is 0.4-5%. The material has the advantages that the two-dimensional ultra-thin Me-SAPO-34 (Me: Fe, Co or Ni) molecular sieve sheet material is prepared by using cheap and easily-available aluminum phosphate, a silicon source and an organic amine template agent as reactants and combining a chemical stripping method and a gas phase crystallization method. The obtained two-dimensional ultra-thin ME-SAPO-34 (M: Fe, Co or Ni) molecular sieve sheet material has a large specific surface, the content of silicon and metal ions can be adjusted within a certain range, and the method is universal. The material has multiple advantages and can be industrially mass produced. The method uses less template agent, is suitable for industrial mass production, and has low cost and little environmental pollution. The invention discloses a preparation method of the material.

Description

technical field [0001] The invention relates to a two-dimensional ultrathin Me-SAPO-34 molecular sieve sheet material and a preparation method thereof. Background technique [0002] SAPO-34 molecular sieve is the most important member of SAPO series molecular sieves (alumino-silicon phosphate molecular sieve), which has good thermal stability, hydrothermal stability and ion exchange. By introducing metal ions into the SAPO-34 molecular sieve, its catalytic activity can be expanded and improved. For example, the Fe-SAPO-34 molecular sieve obtained by introducing Fe can improve the performance of SAPO-34 molecular sieve in catalytic methanol dehydration to olefin reaction; the Fe-SAPO-34 molecular sieve obtained by introducing Fe can improve the performance of SAPO-34 molecular sieve in catalytic methanol dehydration. The performance of olefin-making reaction; the Co-SAPO-34 molecular sieve obtained by introducing Co can improve the performance of SAPO-34 molecular sieve in c...

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Problems solved by technology

[0004] Summarizing the results of the literature on the preparation of Me-SAPO-34 (Me:Fe, Co or Ni) molecular sieves over the years, it can be found that there is no method to prepare a two-dimensional superstructure with an adjustable silicon-aluminum ratio and a thickness below 30 nanometers. Thin Me-SAPO-34 (Me:Fe, Co or Ni) molecular sieve flake material

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