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scm-28 molecular sieve and its preparation method and application

A technology of SCM-28 and molecular sieves, which is applied in the direction of molecular sieves and base exchange compounds, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of not obtaining SCM-28 molecular sieves, and achieve simple and easy preparation methods, mild operating conditions, The effect of low cost and high yield

Active Publication Date: 2022-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the current prior art, no new SCM-28 molecular sieve has been obtained

Method used

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  • scm-28 molecular sieve and its preparation method and application
  • scm-28 molecular sieve and its preparation method and application
  • scm-28 molecular sieve and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 0.64 grams of aluminum isopropoxide, add 3.99 grams of deionized water, add 3.34 grams of 30wt% sodium hydroxide solution, stir for 10 minutes and add 19.3 grams of N,N'-(1,4- Phenylene bis(methylene))bis(N-methylpyrrolidine) ammonium hydroxide (hereinafter abbreviated as T) solution, stirred for 15 minutes, added 7.5 g of 40% silica sol, and stirred for 4 hours to obtain the following solution: The synthetic mother liquor composed of molar ratio:

[0042] 0.5Al 2 O 3 :16SiO 2 :3.2T:8Na:480H 2 O

[0043] The above synthetic mother liquor was placed in a closed reaction vessel for crystallization, the crystallization temperature was 175 °C, and the crystallization time was 110 hours. After the crystallization product was washed and dried at 90 °C for 12 hours, it was calcined at 550 °C for 6 hours in an air atmosphere to obtain SCM-28 molecular sieve, it has such as figure 1 XRD pattern shown, with SiO 2 : 0.094Al 2 O 3 chemical composition. The obtained ...

Embodiment 2

[0047] Weigh 0.52 g of aluminum sulfate octadecahydrate, add 3.93 g of deionized water, add 2 g of 30 wt % sodium hydroxide solution, add 15 g of T solution with a weight concentration of 16 wt % after stirring for 10 minutes, add after stirring for 15 minutes 11.72 g of 40% silica sol was stirred for 1 hour to obtain a synthetic mother liquor with the following molar ratio:

[0048] 0.5Al 2 O 3 :50SiO 2 :5T:10Na:900H 2 O

[0049] The above synthetic mother liquor was placed in a closed reaction vessel for crystallization, the crystallization temperature was 205 °C, and the crystallization time was 196 hours. That is, SCM-28 molecular sieve is obtained, which has SiO 2 : 0.031Al 2 O 3 chemical composition, with image 3 XRD pattern shown. The interplanar spacing data of its XRD diffraction are as follows:

[0050]

Embodiment 3

[0052] Weigh 0.256 grams of sodium aluminate, add 0.7 grams of potassium hydroxide, add 7.46 grams of deionized water, add 7.52 grams of T solution with a weight concentration of 16wt% after stirring for 10 minutes, add 2.34 grams of 40% silica sol after stirring for 25 minutes , and after stirring for 1 hour, the synthetic mother liquor having the following molar ratio composition was obtained:

[0053] 0.5Al 2 O 3 :5SiO 2 :1.25T:1Na:4K:270H 2 O

[0054] The above synthetic mother liquor was placed in a closed reaction vessel for crystallization, the crystallization temperature was 240 °C, and the crystallization time was 144 hours. That is, SCM-28 molecular sieve is obtained. It has SiO 2 : 0.37Al 2 O 3 The chemical composition and the interplanar spacing data of XRD diffraction are as follows:

[0055]

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Abstract

The invention discloses an SCM-28 molecular sieve with a novel structure and a preparation method and application thereof. The SCM-28 molecular sieve has the following chemical composition in molar ratio: SiO 2 : nAl 2 O 3 , 0.005≤n≤0.4, the interplanar spacing in the XRD diffraction pattern of the SCM-28 molecular sieve includes and the corresponding relative intensities are 10-60, 10-40, 10-40, 10-40, 30-80, 10 ‑60, 30‑100, 10‑60, 20‑70, 10‑80, 10‑70. The SCM-28 molecular sieve provided by the invention can be used in the fields of catalysis, adsorption and the like.

Description

technical field [0001] The invention relates to an SCM-28 molecular sieve and a preparation method thereof, and the use of the SCM-28 molecular sieve as an adsorbent or a catalyst. Background technique [0002] Porous materials are a class of solid-state compounds with regular pore structures. According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), porous materials can be divided into the following three categories according to their pore diameters: Materials with a pore size less than 2nm are microporous materials. (micropore materials); materials with a pore size between 2 and 50 nm are mesopore materials; materials with a pore size greater than 50 nm are macropore materials, and the pore diameter of zeolite molecular sieves is generally below 2 nm, so they are classified as Microporous material. [0003] Zeolite molecular sieve is a crystalline silicate material composed of silicon-oxygen tetrahedron [SiO 4 ] 4- and the aluminum ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/48B01J29/70B01J20/18
CPCC01B39/48B01J29/70B01J20/18C01P2004/03Y02P20/52
Inventor 陶伟川袁志庆王振东
Owner CHINA PETROLEUM & CHEM CORP