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Method for synthesizing nano K, Ca-CHA zeolite

A zeolite and nanotechnology, applied in the field of preparation of nano K, Ca-CHA zeolite, can solve the problems of application limitation, loss of molecular shape-selective adsorption properties and catalytic properties, difficulty in reflecting the value of molecular sieve adsorption and catalytic properties, etc., reaching the price Effects of low cost, abundant reserves, and easy industrialization

Active Publication Date: 2020-06-16
FUYU ZHANGJIAGANG NEW MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the calcium-rich STI zeolite crystal structure is roasted at 350°C for 2 hours to remove its adsorption and crystallization water, the skeleton is completely destroyed and becomes amorphous aluminosilicate, which loses the molecular shape-selective adsorption properties and properties of zeolite molecular sieve. Catalytic properties, so the application in the fields of catalysis and adsorption is greatly limited, often only the general amorphous aluminosilicate raw materials can be used to produce cement auxiliary materials or coatings, wall fillers, etc.
In individual cases, there are also water purifiers made of ion exchange to remove heavy metal ions, and the value of the adsorption and catalytic properties of molecular sieves is difficult to reflect

Method used

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  • Method for synthesizing nano K, Ca-CHA zeolite
  • Method for synthesizing nano K, Ca-CHA zeolite
  • Method for synthesizing nano K, Ca-CHA zeolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add 50g of roasted STI ore powder and 2.5g of CHA zeolite seed crystals into 450ml of KOH aqueous solution with a concentration of 1.0mol / L, stir vigorously at room temperature for 2 hours and mix them uniformly as reactants. The reactants are poured into 750ml of pressure-resistant stainless steel Put it in a reaction kettle, seal it, place it in a homogeneous reaction oven at 130°C, react under dynamic conditions for 48 hours, take it out, cool it, filter it, wash it with deionized water until the filtrate pH=7-8, then filter it and dry it . The product is identified as CHA crystalline phase through XRD (see figure 2 C). With the XRD powder diffraction spectrum (see figure 2 D) In ​​comparison, the position of the diffraction peak slightly shifts to a larger angle, which is due to the lower SAR of the product synthesized in Example 1, which causes the unit cell to shrink somewhat compared to the unit cell of the H-CHA zeolite standard sample. Table 3 lists the XR...

Embodiment 2

[0060] Add 50g of roasted STI ore powder and 2.5g of CHA zeolite seed crystals into 450ml of KOH aqueous solution with a concentration of 1.0mol / L, stir vigorously at room temperature for 2 hours, mix well and use it as a reactant, and pour the reactant into a 750ml pressure-resistant In a stainless steel reaction kettle, sealed, placed in a homogeneous reaction oven at 150°C, reacted under dynamic conditions for 48 hours, taken out, cooled, filtered, washed with deionized water until the filtrate PH = 7-8, then filtered and dried Dry. The product was identified as CHA crystalline phase by XRD. Table 3 lists the XRF component analysis data of the reaction raw material roasted STI ore powder and the product of Example 2. The SARs of the reaction product and mineral powder raw material are 5.43 and 5.54, which are very close. The content of the two MgO raw materials is 0.19% and the product is 0.0%, which is also almost the same. The content of CaO in the product is 6.35%, wh...

Embodiment 3

[0062] Add 50g of roasted STI ore powder and 2.5g of CHA zeolite seed crystals into 450ml of KOH aqueous solution with a concentration of 2.0mol / L, stir vigorously at room temperature for 2 hours, mix well and use it as a reactant, and pour the reactant into a 750ml pressure-resistant In a stainless steel reaction kettle, sealed, placed in a homogeneous reaction oven at 150°C, reacted under dynamic conditions for 48 hours, taken out, cooled, filtered, washed with deionized water until the filtrate PH = 7-8, then filtered and dried Dry. The product was identified as CHA crystalline phase by XRD. Table 3 lists the XRF component analysis data of the reaction raw material roasted STI ore powder and the product of Example 2. The SARs of the reaction product and mineral powder raw material were 6.42 and 5.43, higher than the latter. The MgO contents of the products are 0.0% and 0.19%, respectively, which are also almost the same. The content of CaO in the product is 7.74%, which ...

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Abstract

The invention relates to a synthesized nano K, Ca-CHA zeolite. Natural calcium-rich STI stilbite mineral powder as a first raw material is roasted at high temperature to obtain amorphous powder, a CHAseed crystal is added into the amorphous powder, and hydrothermal reaction is performed in a KOH aqueous solution to synthesize the nano K, Ca-CHA zeolite. The nano K, Ca-CHA zeolite can be preparedinto nano H, Ca-CHA zeolite. The nano H, Ca-CHA zeolite is used as a second raw material, the second raw material is subjected to ammonium exchange to obtain a first precursor, and the first precursoris roasted to remove ammonia to obtain the nano H, Ca-CHA zeolite. The prepared nano CHA zeolite can be applied to CO2 enrichment and adsorption removal of CO, H2S, HCN, COS, NH3, NOx and other smallmolecular toxic and harmful gases in waste gas, and the preparation method is low in raw material price, simple in synthesis process, free of environmental pollution and easy to industrialize.

Description

technical field [0001] The invention belongs to the technical field of zeolite molecular sieves, and in particular relates to a preparation method of nanometer K,Ca-CHA zeolite. Background technique [0002] The schematic diagram of the skeleton and pore opening structure of CHA zeolite molecular sieve is shown in figure 1 , is given by [SiO 4 ] and [AlO 4 ] Tetrahedral co-oxygen links form tetraoxo rings and hexaoxo ring primary structures d6r cages and cha cages constructed by tetraoxo rings and octaoxo rings, d6r cages and cha cages are connected to each other, and further orderly connected to form an open aperture 0.38×0.38nm pore structure. The cavity of the cha cage is very large, reaching 0.84 × 0.84 × 0.82 nm. [0003] The CHA structure type zeolite was previously found in natural minerals, commonly known as Chabasite, a SiO 2 / Al 2 o 3 Ca-type chabazite with a molar ratio (SAR) of 4 (Nature, 181, 1794-1796, 1958). Due to the small reserves of this natural pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30B01D53/02C01B39/02
CPCB01J20/165B01D53/02C01B39/02B01D2253/108B01D2257/502B01D2257/304B01D2257/408B01D2257/406B01D2257/40B01D2257/308C01P2004/03C01P2002/72Y02P20/151
Inventor 濮鹏翔曹宇凡龙英才
Owner FUYU ZHANGJIAGANG NEW MATERIALS TECH CO LTD
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