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A kind of ZSM-5 molecular sieve and synthetic method thereof

A technology of ZSM-5 and synthesis method, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of expensive and difficult to obtain template agents, achieve small internal diffusion resistance, The effect of strong adaptability of raw materials and non-agglomeration of grains

Active Publication Date: 2019-05-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a kind of ZSM-5 molecular sieve and synthetic method thereof, to overcome the problem that template agent is expensive and difficult to obtain when preparing thin plate type ZSM-5 molecular sieve in the prior art

Method used

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  • A kind of ZSM-5 molecular sieve and synthetic method thereof
  • A kind of ZSM-5 molecular sieve and synthetic method thereof
  • A kind of ZSM-5 molecular sieve and synthetic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Activate the aluminum source with an inorganic base.

[0039] 2gAl 2 o 3 Powder (pseudoboehmite) was dispersed in 100g deionized water, then 8g NaOH solid was added and stirred at room temperature to fully hydrolyze for 2 hours to prepare B solution;

[0040] (2) Synthesize ZSM-5 zeolite with activated aluminum source.

[0041] 100g silica sol (industrial grade, SiO 2 ≥30wt%) in 100g of deionized water, then add 18g of n-butylamine solution (industrial grade), fully stir at room temperature for 1 hour to make A solution; slowly add the activated B solution to A under stirring In the solution, a uniform gel C was made; 7.5 g of 98% concentrated sulfuric acid was added to the gel C to eliminate the influence of excess NaOH in (1) on the gel. The gel mixture has the following molar composition: SiO 2 / Al 2 o 3 =25, NaOH / SiO 2 = 0.1, NBA / SiO 2 =0.5,H 2 O / SiO 2 =30. The prepared gel was transferred to a synthesis kettle, crystallized at 170°C for about 24 hou...

Embodiment 2

[0043] Repeat Example 1, but add 1 g of nanometer ZSM-5 zeolite crystal seeds to the gel C prepared in step (2), and the seed crystal particle size is <100 nm. A ZSM-5 zeolite product was obtained with a relative crystallinity of 80% and a particle size of 2 μm (c)×0.3 μm (b)×1.5 μm (c).

Embodiment 3

[0045] Repeat Example 1, but add 2g of nanometer ZSM-5 zeolite crystal seeds to the gel C prepared in step (2), and the seed crystal particle size is <100nm. A ZSM-5 zeolite product was obtained with a relative crystallinity of 80% and a particle size of 2 μm (c)×0.2 μm (b)×1.5 μm (c).

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Abstract

The invention discloses a ZSM-5 molecular sieve and a synthesizing method thereof. The synthesizing method comprises the following steps of (1) adjusting the activity of an aluminum source, performing inert treatment on the active aluminum source, and activating the inert aluminum source; (2) adding a template agent into a silicon source solution, stirring the treated aluminum source solution, dripping into the silicon source solution, adding a crystal seed, and preparing into a uniform gel; (3) hydrothermally crystallizing the prepared gel for 1 to 200h at the temperature of 100 to 200 DEG C, filtering a crystallized solid, washing, drying, and calcining, so as to obtain the ZSM-5 molecular sieve, wherein the active aluminum source is one or several of a group formed by aluminum sulfate, aluminum chloride, aluminum nitrate and aluminium isopropoxide; the inert aluminum source is one or several of a group formed by pseudo-boehmite, sodium metaaluminate, aluminium hydroxide and metal aluminum. Thin sheet type ZSM-5 zeolite has the advantages that the straight pore channel is very short, the inner diffusion drag is small, the agglomeration of crystal grains is avoided, and the thin sheet type ZSM-5 zeolite is favorable for processing wearproof catalysts.

Description

technical field [0001] The invention belongs to the field of aluminosilicate zeolite synthesis and relates to a synthesis method of ZSM-5 molecular sieve. Background technique [0002] The ZSM-5 zeolite (USP 3702886) invented by Mobil Petroleum Company of the United States has become a very important shape-selective catalytic material due to its unique pore structure and good catalytic performance. ZSM-5 zeolite is the auxiliary agent and catalyst for many traditional catalytic technologies such as catalytic cracking, toluene disproportionation, benzene and toluene alkylation, and aromatization of low-carbon hydrocarbons. It is also the first choice for emerging coal chemical technologies such as methanol-to-gasoline and methanol-to-propylene. catalyst. The well-known processes developed with ZSM-5 zeolite are: Mobil middle distillate dewaxing process (MDDW), lubricating oil dewaxing process (MLDW), catalytic reforming process, selective reforming of gasoline and M-reformin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/40
CPCC01B39/40C01P2002/72
Inventor 郭洪臣刘家旭刘春燕庞新梅李兆飞李发永
Owner PETROCHINA CO LTD
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