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Method for preparing nano-scale sodalite molecular sieve formed matter

A technology of molding and sodalite, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of reducing the effective specific surface area, reducing the use effect, and unfavorable molecular diffusion in the molecular sieve channels.

Active Publication Date: 2016-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, on the one hand, the effective specific surface area is reduced, and on the other hand, the pores of the molecular sieve are blocked, which is not conducive to the diffusion of molecules, thereby reducing the use effect.

Method used

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  • Method for preparing nano-scale sodalite molecular sieve formed matter
  • Method for preparing nano-scale sodalite molecular sieve formed matter
  • Method for preparing nano-scale sodalite molecular sieve formed matter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Mix 7.4 grams of solid silicon dioxide with 7.4 grams of alumina, add 22 milliliters of 26.2% (mass) NaOH aqueous solution, stir until agglomerated, then extrude with a diameter of 2 mm orifice to obtain strips ;

[0029] (2) Dry the strip at 120°C for 2h, and then bake at 650°C for 4h;

[0030] (3) Put the roasted strips into a crystallization kettle, add 94 ml of 26.2% (mass) NaOH aqueous solution, and crystallize at 70° C. for 4 hours;

[0031] (4) The crystallized strips were washed with 0.01M NaOH aqueous solution, then deionized water until neutral, and dried at 70° C. for 3 hours to obtain a nano-sized sodalite molecular sieve shaped product.

[0032] The feeding formula is SiO 2 :Al 2 o 3 : Na 2 O: H 2 O=1:0.5:12.3:52.3.

[0033] Characterize the final product, the XRD characterization results are as follows figure 1As shown, the peak marked by the triangle in the figure is the characteristic peak of sodalite, and there are peaks of unreacted alumina...

Embodiment 2

[0035] (1) Stir 7.0 grams of solid silicon dioxide and 7.2 grams of pseudoboehmite evenly, add 26 milliliters of 18.0% (mass) NaOH aqueous solution, stir until agglomerated, and then use an orifice plate with a diameter of 8 mm to extrude get strips;

[0036] (2) Dry the strips at 70°C for 8h, and then roast at 680°C for 4h;

[0037] (3) Put the roasted strips into a crystallization kettle, add 94 ml of 20.5% (mass) NaOH aqueous solution, and crystallize at 80° C. for 4 hours;

[0038] (4) Wash the crystallized strips with 0.01M NaOH aqueous solution, and then wash with deionized water until neutral. Dry at 70° C. for 3 hours to obtain a nano-sized sodalite molecular sieve shaped product.

[0039] The feeding formula is SiO 2 :Al 2 o 3 : Na 2 O: H 2 O=1:0.4:10.4:66.7.

[0040] The XRD characterization results are the same as figure 1 . The SEM characterization results of the center of the bar cross section are as follows Figure 4 As shown in , it can be seen that t...

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Abstract

The invention discloses a method for preparing nano-scale sodalite molecular sieve formed matter. The pure nano-scale sodalite molecular sieve formed matter can be prepared under the condition that no organic additive or structure-directing agent exists. The method includes the steps that 1, a solid-phase silicon source and a solid-phase aluminum source are mixed evenly, a first alkaline aqueous solution is added, the mixture is stirred evenly and formed, and formed matter is obtained; 2, the formed matter is dried and then roasted; 3, the roasted formed matter is put into a second alkaline aqueous solution, and after crystallization, the nano-scale sodalite molecular sieve formed matter is obtained.

Description

technical field [0001] The invention relates to a method for preparing a nano-scale sodalite molecular sieve molding, which belongs to the field of inorganic nano-material preparation. Background technique [0002] Sodalite (SOD) is one of the most traditional molecular sieves. It consists of body-centered cubic SOD cages (that is, β cages, consisting of 6 four-membered rings and 8 six-membered rings) through its four-membered rings and six-membered rings. ring connected. Sodalite has a three-dimensional Im3m lattice symmetry structure, the diameter of the orifice of the six-membered ring is about 0.28nm, and the maximum diameter of the skeleton is 0.63nm. Due to the small pore diameter of sodalite, only materials such as He, NH 3 , H 2 O and H 2 Small molecules and some ions pass through, making the separation and storage of small-sized molecules have potential application values, such as separation of hydrogen-containing mixtures and hydrogen storage. At the same time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
Inventor 吉媛媛苗小培付强
Owner CHINA PETROLEUM & CHEM CORP
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