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Method for preparing ZSM-22 molecular sieve

A technology of molecular sieves and templates, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the narrow synthesis phase area, the application limitation of ZSM-22 molecular sieve, and the difficulty in synthesizing ZSM-22 molecular sieve nanosheets and other problems, to achieve the effect of not easy to deposit carbon and expand the scope of application

Active Publication Date: 2021-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] From the above review, it can be seen that although the method of synthesizing ZSM-22 molecular sieve is relatively mature, it is difficult to synthesize ZSM-22 molecular sieve nanosheets, and its synthesis phase area is narrow, which greatly limits the application of ZSM-22 molecular sieve

Method used

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  • Method for preparing ZSM-22 molecular sieve
  • Method for preparing ZSM-22 molecular sieve

Examples

Experimental program
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Embodiment 1

[0042] Dissolve 3.72 grams of 1-ethylpyridinium bromide, 0.06 grams of sodium aluminate, 0.5 grams of sodium hydroxide and 0.4 grams of urea in 15.5 grams of deionized water, slowly add 10 grams of silica sol under stirring conditions, and continue stirring for one hour Put it into a stainless steel reaction kettle lined with polytetrafluoroethylene, and crystallize at 150°C for 4 days. After the crystallization is completed, filter, wash and dry to obtain ZSM-22 molecular sieve.

[0043] The material ratio (molar ratio) of the reactants is: SiO 2 / Al 2 o 3 =180; 1-ethylpyridinium bromide / SiO 2 = 0.3; OH - / SiO 2 =0.2;H 2 O / SiO 2 =18; urea / SiO 2 = 0.1.

[0044] The SEM photograph of the ZSM-22 molecular sieve that embodiment 1 makes is as figure 1 As shown, its average thickness is about 10 nanometers, and the flaky crystals are randomly interlaced rather than stacked together regularly. The silicon-aluminum ratio of the molecular sieve nanosheet is 145.

Embodiment 2

[0046] In addition to the material ratio (molar ratio) of the reactants is: SiO 2 / Al 2 o 3 =100; 1-ethylpyridinium bromide / SiO 2 = 0.5; OH - / SiO 2 =0.1;H 2 O / SiO 2 =20; urea / SiO 2 Except =0.1, all the other are with embodiment 1.

[0047] The SEM photograph of the ZSM-22 molecular sieve that makes is as figure 2 As shown, the average thickness is 10 nm, and the silicon-aluminum ratio is 101.

Embodiment 3

[0049] In addition to the material ratio (molar ratio) of the reactants is: SiO 2 / Al 2 o 3 =20; 1-ethylpyridinium bromide / SiO 2 = 0.3; OH - / SiO 2 =0.2;H 2 O / SiO 2 =18; urea / SiO 2 Except =0.1, all the other are with embodiment 1.

[0050] The prepared ZSM-22 molecular sieve has an average thickness of 15 nanometers and a silicon-aluminum ratio of 17.

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Abstract

The invention relates to a method for preparing a ZSM-22 molecular sieve, which comprises the step of carrying out crystallization treatment on a mixture formed by a silicon source, an aluminum source, an alkali source, a template agent, urea and water to obtain the molecular sieve. In the mixture, the molar composition of a silicon source based on SiO2, an aluminum source based on Al2O3, an alkali source based on OH-, urea, a template agent and water is as follows: the ratio of SiO2 to Al2O3 is 15-500; the ratio of the template agent to SiO2 is 0.01-0.5; \the ratio of OH to SiO2 is 0.01-0.50;the ratio of H2O to SiO2 is 9-30; and the ratio of urea to SiO2 is 0.005-0.50. The molecular sieve crystal prepared by the method provided by the invention has the advantages of sheet morphology, small thickness and adjustable silica-alumina ratio, and meets different requirements for catalysts in chemical production.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a method for preparing ZSM-22 molecular sieve and the molecular sieve prepared by the method. Background technique [0002] ZSM-22 molecular sieve was first synthesized in the 1980s by Dwyer et al. from Mobil Company of the United States. Its main channel is a one-dimensional elliptical straight channel with a 10-membered ring opening and a pore size of 0.46nm×0.57nm. The unit cell parameters are [Zeolites, 1987, (7): 393-397]. [0003] Due to its mild acidic properties and space-selective effect, ZSM-22 molecular sieves are used in the isomerization reaction of linear alkanes, methanol to olefins, aromatics alkylation, hydrocracking, catalytic dewaxing, alkane aromatization, etc. field. [0004] Both theoretical and experimental studies have shown that most of the reactions catalyzed by ZSM-22 molecular sieves occur at the pores, so the crystal morphology is an important ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02B01J29/70
CPCC01B39/02B01J29/7042B01J2229/16C01P2004/03
Inventor 杨为民刘闯王振东祁晓岚孔德金
Owner CHINA PETROLEUM & CHEM CORP
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