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beta molecular sieve catalyst, preparation method and application

A technology of molecular sieves and catalysts, applied in the field of Beta molecular sieve catalysts, preparation and application, can solve the problems of high catalyst strength, low catalytic activity, low catalyst strength, etc., and achieve good catalytic performance

Active Publication Date: 2020-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, silica sol and alumina are used as binders. When the binder dosage is large, the catalyst strength is too high, the molecular sieve content is low, and the catalytic activity is low. When the binder dosage is small, the catalyst strength is low. , severe pulverization; and the problem of long time required for secondary crystallization

Method used

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  • beta molecular sieve catalyst, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] a) Preparation of synthetic Beta molecular sieves: Alkaline silica sol, aluminum sulfate octadecahydrate, tetraethylammonium hydroxide (TEAOH) and water are used as synthetic raw materials, and the above raw materials are prepared according to the material ratio (molar ratio):

[0051] SiO 2 / Al 2 o 3 =25

[0052] TEAOH / SiO 2 =0.20

[0053] h 2 O / SiO 2 =18

[0054] After mixing evenly, put it into a stainless steel reaction kettle, and crystallize at 150°C for 5 days while stirring. After the crystallization is completed, filter, wash and dry to obtain the synthesized Beta molecular sieve. The weight loss rate of the synthesized Beta molecular sieve was tested to be 13.1% by weight by roasting at 550° C. for 5 hours in an air atmosphere.

[0055] b) Alkaline silica sol (SiO 2 40.0% by weight) is silicon source, sodium aluminate (Al 2 o 3 43.0 wt%, Na 2 (235.0% by weight) is the aluminum source, 0.25 gram of sodium aluminate is mixed with 48.1 gram of synt...

Embodiment 2

[0060] Same as [Example 1], except:

[0061] b) 59.6 grams of synthetic state Beta molecular sieve, alkaline silica sol (SiO 2 40.0% by weight) 4.5 grams, 1.05 grams of scallop powder, sodium aluminate (Al 2 o 3 43.0 wt%, Na 2 O 35.0% by weight) 0.25 grams are mixed evenly, silicon aluminum molar ratio SiO 2 / Al 2 o 3 =28.5, alkali-silicon molar ratio alkali / SiO 2 =0.094, a bar-shaped molecular sieve catalyst precursor with a Beta molecular sieve content of 96.3 wt%, a binder content of 3.7 wt%, and a four-leaf clover cross section was prepared by extrusion molding.

[0062] c) Calcining the Beta molecular sieve catalyst precursor I prepared in step b) at 550° C. under air atmosphere for 6 hours to obtain the Beta molecular sieve catalyst precursor II.

[0063] d) Contact the Beta molecular sieve catalyst precursor II prepared in step c) with a 15% ammonium nitrate solution at 60° C. for 3 times for 1 hour each time, separate the solid product, dry it, and roast it to...

Embodiment 3

[0065] Same as [Example 1], except:

[0066] b) 77.0 grams of synthetic Beta molecular sieves, alkaline silica sol (SiO 2 40.0% by weight) 4.5 grams, 1.05 grams of scallop powder, sodium aluminate (Al2 o 3 43.0 wt%, Na 2 O 35.0% by weight) 0.25 g and mix well. Molar ratio of silicon to aluminum to SiO 2 / Al 2 o 3 =28.5, alkali-silicon molar ratio alkali / SiO 2 =0.094, a strip-shaped molecular sieve catalyst precursor with a Beta molecular sieve content of 97.1% by weight, a binder content of 2.9% by weight, and a four-leaf clover cross section was prepared by extrusion.

[0067] c) Calcining the Beta molecular sieve catalyst precursor I prepared in step b) at 550° C. under air atmosphere for 6 hours to obtain the Beta molecular sieve catalyst precursor II.

[0068] d) Contact the Beta molecular sieve catalyst precursor II prepared in step c) with a 15% ammonium nitrate solution at 60° C. for 3 times for 1 hour each time, separate the solid product, dry it, and roast it...

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Abstract

The invention relates to a Beta molecular sieve catalyst, a preparation method and an application thereof. The Beta molecular sieve catalyst comprises the following components in parts by weight: a) 92-99 parts of a Beta molecular sieve, and b) 1-8 parts of an alumino-silica gel binder; wherein the alumino-silica gel binder is obtained by a step that a silicon source and an aluminium source are contacted with alkali.

Description

technical field [0001] The invention relates to a Beta molecular sieve catalyst, a preparation method and application. Background technique [0002] Beta molecular sieves were first successfully synthesized by Mobil in 1967. It has a unique three-dimensional twelve-membered ring channel system, a linear channel with a pore size of 0.76 nm × 0.64 nm, and a curved channel with a pore size of 0.55 nm × 0.55 nm. The estimated structure of Beta molecular sieve is very complex, including multiple crystal forms, such as type A (*BEA structure), type B and type C (BEC structure). Beta molecular sieves are widely used in the petrochemical industry due to their strong acidity and unique pore structure. For example, it is used as an adsorbent for the separation of aromatic hydrocarbons, and as a catalyst for gasoline upgrading, hydroisomerization, hydrocracking, catalytic reforming dewaxing, benzene alkylation, and transalkylation. The catalyst prepared with Beta molecular sieve as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70C07C2/66C07C15/073
CPCB01J29/7007B01J29/7057B01J2229/18B01J2229/42C07C2/66C07C2529/70C07C15/073Y02P20/52
Inventor 杨为民王振东孙洪敏张斌
Owner CHINA PETROLEUM & CHEM CORP
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