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X type zeolite molecular sieve and method for producing the same

A zeolite molecular sieve and molecular sieve technology are applied in the direction of molecular sieves and alkali exchange compounds, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., which can solve problems such as difficult recovery, and achieve the solution of difficult recovery, strong magnetism and magnetic stability, Good effect of crystal shape

Inactive Publication Date: 2008-07-16
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide X-type zeolite molecular sieve and its preparation method. The X-type zeolite molecular sieve prepared by the method is a magnetic iron-doped X-type molecular sieve, which has strong magnetic properties and magnetic stability. It not only solves the problem that the existing powdered zeolite molecular sieve is difficult to recover in the reaction solution, but also further improves its adsorption performance, and further expands the application range of the zeolite molecular sieve, so that the zeolite molecular sieve can be used in catalytic reactions using iron as a catalyst.

Method used

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  • X type zeolite molecular sieve and method for producing the same
  • X type zeolite molecular sieve and method for producing the same
  • X type zeolite molecular sieve and method for producing the same

Examples

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Embodiment 1

[0027] This example is a comparative example, and a pure X-type zeolite molecular sieve was synthesized under hydrothermal pressure.

[0028] Weigh 23g Na respectively 2 SiO 3 9H 2 O, 11.2g NaAlO 3 , 15.5g NaOH and 10.8g KOH, with 92ml deionized water to configure a molar ratio of 3.5Na 2 O:K 2 O:0.7Al 2 o 3 : 0.9SiO2 2 : 62H 2 The starting material of O was put into a 500ml three-neck flask, aged and stirred at 70°C for 3 hours, then crystallized at 95°C for 2 hours, separated by filtration to obtain a crystalline solid phase substance, and washed with deionized water to medium properties, and finally dry the crystalline solid-phase substance at a temperature of 115°C to obtain X-type zeolite molecular sieves.

[0029] Curve I in Fig. 1 is the X-ray diffraction spectrum of the pure X-type zeolite molecular sieve synthesized in this embodiment, which is consistent with the X-ray diffraction spectrum of the standard pure X-type zeolite molecular sieve. Curve a in Figu...

Embodiment 2

[0031] The first step, the synthesis of iron-doped X-type zeolite molecular sieve

[0032] Take 2g H 2 C 2 o 4 , 0.5g Fe(NO 3 ) 3 Dissolved in 30ml deionized water to prepare a buffer solution of ferric oxalate , take 23g Na 2 SiO 3 9H 2Dissolve O in 50ml of water to form a sodium silicate solution, dissolve 11.2g of sodium aluminate in 40ml of water to form a sodium aluminate solution, dissolve 15.5g of sodium hydroxide and 10.8g of potassium hydroxide in 32ml of water to form two A mixed solution of alkali and alkali, slowly add solution  to solution , while stirring, then dropwise add solution  and solution  mixed solution, while stirring, put the evenly stirred mixture into a three-necked bottle Inside, aged and stirred at a temperature of 70°C for 3 hours, then crystallized at a temperature of 95°C for 2 hours, separated by filtration to obtain a crystalline solid-phase substance, and washed the crystalline solid-phase substance with deionized water to neutr...

Embodiment 3

[0038] The first step, the synthesis of iron-doped X-type zeolite molecular sieve

[0039] Take 0.5g H 2 C 2 o 4 , 0.5g Fe(NO 3 ) 3 Dissolved in 30ml deionized water to prepare a buffer solution of ferric oxalate , take 23g Na 2 SiO 3 9H 2 Dissolve O in 50ml of water to form a sodium silicate solution, dissolve 11.2g of sodium aluminate in 40ml of water to form a sodium aluminate solution, dissolve 15.5g of sodium hydroxide and 10.8g of potassium hydroxide in 32ml of water to form two A mixed solution of alkali and alkali, slowly add solution  to solution , while stirring, then dropwise add solution  and solution  mixed solution, while stirring, put the evenly stirred mixture into a three-necked bottle Inside, aged and stirred at a temperature of 70°C for 3 hours, then crystallized at a temperature of 95°C for 2 hours, separated by filtration to obtain a crystalline solid-phase substance, and washed the crystalline solid-phase substance with deionized water to ne...

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Abstract

The invention relates to an X-shaped zeolite molecular sieve and a method for preparing thereof, relating to a field of zeolite molecular sieve material; The X-shaped zeolite molecular sieve is a magnetic iron-doped X-shaped zeolite molecular sieve; magnetic ferroferric oxide is formed in the zeolite lattice, wherein, quality percentage of Fe occupying the molecular sieve is 1.89 percent to 3.48 percent. The preparing method comprises the steps that, iron-doped X-shaped zeolite molecular sieve is firstly compounded and then the magnetized magnetic iron-doped X-shaped zeolite molecular sieve is prepared through hydrogen reduction; the method results in a structure of Fe3O4 formed in frame of the iron-doped X-shaped zeolite molecular sieve. The magnetic iron-doped X-shaped zeolite molecular sieve has strong magnetism and magnetic stability, which not only solves the problem that the existing powdery zeolite molecular sieve is difficult to be recycled in reaction solution, and further improves absorption property of the sieve, but also enlarge application range of the zeolite molecular sieve, thereby allowing the zeolite molecular sieve to be applied to catalytic reaction in which iron acts as the catalyst.

Description

technical field [0001] The technical solution of the invention relates to the field of zeolite molecular sieve materials, in particular to X-type zeolite molecular sieves and a preparation method thereof. Background technique [0002] The currently synthesized zeolite molecular sieves are powder products. Although fine zeolite molecular sieve crystals have good performance in terms of selectivity, adsorption, ion exchange, thermal stability and catalytic application, the powdered product of zeolite molecular sieve is difficult to separate from the solution it handles, and it is extremely inconvenient to use in industrial production. Therefore, it must be prepared into aggregates with a certain shape and size in practical applications. The current method for preparing such aggregates is to add 20% to 60% of binder to zeolite molecular sieve powder to make particles with certain strength and shape. CN 85100759 Zeolite Molecular Sieve Catalyst and Its Preparation The zeolite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/50C01B39/22
Inventor 曹吉林范红波刘秀伍刘振路
Owner HEBEI UNIV OF TECH
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