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A kind of method for preparing ZSM-22 molecular sieve

A molecular sieve and template technology, applied in molecular sieve catalysts, chemical instruments and methods, crystalline aluminosilicate zeolite, etc., can solve the narrow synthesis phase region, the application limitation of ZSM-22 molecular sieve, and the difficulty in synthesizing ZSM-22 molecular sieve nanometer Flakes and other problems, to achieve the effect of not easy to deposit carbon and expand the scope of application

Active Publication Date: 2022-05-24
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

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  • A kind of method for preparing ZSM-22 molecular sieve
  • A kind of method for preparing ZSM-22 molecular sieve
  • A kind of method for preparing ZSM-22 molecular sieve

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Experimental program
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Embodiment 1

[0042] 3.72 g 1-ethyl bromide pyridine, 0.06 g sodium aluminate, 0.5 g sodium hydroxide and 0.4 g urea were dissolved in 15.5 g deionized water, 10 g of silica sol was slowly added under stirring conditions, and continued to stir for one hour after loading into a stainless steel reactor lined with PTFE, crystallized at 150 °C for 4 days. After crystallization is completed, it is filtered, washed and dried to obtain a ZSM-22 molecular sieve.

[0043] The material ratio (molar ratio) of the reactant is: SiO 2 / Al 2 O 3 =180;1-Ethylpyridine bromide / SiO 2 ＝0.3；OH - / SiO 2 ＝0.2；H 2 O / SiO 2 =18;Urea / SiO 2 ＝0.1。

[0044] Example 1 prepared ZSM-22 molecular sieve SEM photographs such as Figure 1 As shown, its average thickness is about 10 nanometers, and the flaky crystals are randomly interlaced between them, rather than regularly stacked together. The silicon-aluminum ratio of the molecular sieve nanosheets is 145.

Embodiment 2

[0046] In addition to the reactants, the ratio of materials (molar ratio) is: SiO 2 / Al 2 O 3 =100;1-Ethylpyridine bromide / SiO 2 ＝0.5；OH - / SiO2 ＝0.1；H 2 O / SiO 2 =20;Urea / SiO 2 = 0.1, the rest is the same as Example 1.

[0047] SEM photographs of the ZSM-22 molecular sieve obtained as shown Figure 2 As shown, the average thickness is 10 nanometers, and the silicon-aluminum ratio is 101.

Embodiment 3

[0049] In addition to the reactants, the ratio of materials (molar ratio) is: SiO 2 / Al 2 O 3 =20;1-Ethylpyridine bromide / SiO 2 ＝0.3；OH - / SiO 2 ＝0.2；H 2 O / SiO 2 =18;Urea / SiO 2 = 0.1, the rest is the same as Example 1.

[0050] The average thickness of the ZSM-22 molecular sieve was 15 nanometers and the silicon-aluminum ratio was 17.

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Abstract

The invention relates to a method for preparing a ZSM‑22 molecular sieve, which comprises crystallizing a mixture formed of a silicon source, an aluminum source, an alkali source, a template agent, urea and water to obtain the molecular sieve. In the mixture, SiO 2 Si source in terms of Al 2 o 3 Aluminum source in terms of OH ‑ The molar composition of alkali source, urea, templating agent and water is as follows: SiO 2 / Al 2 o 3 15~500; Template / SiO 2 0.01~0.5; OH ‑ / SiO 2 0.01~0.50; H 2 O / SiO 2 9~30; urea / SiO 2 0.005-0.50. The molecular sieve crystal prepared by the method of the invention has a flake shape, a small thickness, and an adjustable silicon-aluminum ratio, thereby meeting different requirements for catalysts in chemical production.

Description

Technical field [0001] The present invention belongs to the field of catalysts, specifically relates to a method for preparing ZSM-22 molecular sieves and molecular sieves prepared by the method. Background [0002] ZSM-22 molecular sieve was first synthesized by Dwyer et al. of the American Company Dwyer in the 1980s, and its main pore channel is a one-dimensional oval straight channel, the pore opening is 10 yuan ring, the pore diameter is 0.46nm×0.57nm, and the unit cell parameters are [Zeolites,1987,(7):393-397]。 [0003] Due to its mild acidic properties and spatial conformation, ZSM-22 molecular sieve is used in the fields of isomerization of linear alkanes, methanol to olefins, aromatic alkylation, hydrocracking, catalytic dewaxing, alkane aromatization and other fields. [0004] Both theoretical and experimental studies have shown that most of the reactions catalyzed by ZSM-22 molecular sieve occur in the orifice, so the crystal morphology is an important factor affectin...

Claims

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Application Information

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Patent Type & Authority Patents(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