Hard template synthetic composite hole zeolite molecular sieve and its preparing method

Abstract

The present invention relates to inorganic chemistry, physical chemistry and catalytic chemistry technology. The present invention prepares composite pore zeolite molecular sieve with common silicon source and metal atom with doped skeleton as material, and water as solvent, and through hydrothermal treatment and calcinations process to obtain opened channels. In the hydrothermal treatment, material powder is prepared with hard template of rice hull, alkali styrene ion exchange resin or inorganic carbon, or composite template of mixture comprising hard template and organic amine or organic quaternary ammonium salt. The prepared molecular sieve has composite pore structure comprising micro pores and meso pores and pore walls of MFI, BEA, NaY or MOR crystal structure. The prepared molecular sieve may be used widely as adsorbent, catalyst and catalyst carrier in chemical field.

Description

technical field [0001] The invention belongs to the fields of inorganic chemistry, physical chemistry, material chemistry, catalytic chemistry and chemical engineering, and in particular relates to the synthesis of zeolite molecular sieve by template method and its preparation technology. Background technique [0002] As an important part of inorganic microporous crystal materials, molecular sieves are increasingly becoming the starting point for the research of new inorganic materials due to their unique pore structure and exchangeable cation positions. High-quality carrier of new materials such as electricity). In 1961, Barrer and Denny introduced tetramethyl cation into molecular sieve synthesis system and successfully synthesized Na-A molecular sieve with Si / Al>1 [see D.W.Breck, W.G.Eversole, and R.M.Milson, J.Chem.Soc. , 78, (1956), 2338. and D.W.Breck, and J.Y.Smith., Scienct.Am.200, 85, 1959], created the era of organic template synthesis of molecular sieves. Thu...

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Problems solved by technology

However, since zeolite molecular sieves have a smaller specific surface and narrower pores, the diffusion rate of catalytic reactions and the application of catalytic reactions involving macromolecules are greatly limited [see Corma, A.Chem.Rev.97, (1997) , 2373.]

For this reason, Mobil Company has invented MCM-41 series mesoporous molecular sieves [see Kresge, C.T., Leonowicz, M.E., Roth, W.J., Vartuli, J.C. & Beck, J.S.Nature 352, (1992), 710.], this kind of molecular sieve ratio The large surface area and large pore size overcome the shortcomings of zeolite molecular sieves to a certain extent, but due to the amorphous walls of mesoporous molecular sieves, their stability is low, their acidity is low, and their preparation costs are high. These factors limit the Further application of mesoporous molecular sieves [see Corma, A.Chem.Rev.97, (1997), 2373.]

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