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MWW structure molecular sieve catalyst, preparation method and application thereof

A molecular sieve and catalyst technology, applied in the field of MWW structure molecular sieve catalyst, preparation and application, can solve the problems of high catalyst strength, pulverization, long time, etc., and achieve the effect of good catalytic performance

Active Publication Date: 2017-12-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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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  • MWW structure molecular sieve catalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] a) Preparation of synthetic molecular sieves with MWW structure: sodium aluminate (Al 2 o 3 43.0 wt%, Na 2 O 35.0% by weight) 13.2 grams, 2.1 grams of sodium hydroxide, 366.0 grams of water, hexamethyleneimine aqueous solution (80.0% by weight of hexamethyleneimine) 103.3 grams, silica sol (SiO 2 40.0% by weight) 250.0 grams are mixed homogeneously, and the material proportion (mol ratio) that gets reaction mixture is:

[0049] SiO 2 / Al 2 o 3 =30

[0050] NaOH / SiO 2 =0.12

[0051] Hexamethyleneimine / SiO 2 =0.5

[0052] h 2 O / SiO 2 =18

[0053] 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 molecular sieve with MWW structure. The weight loss rate of the synthetic MWW structure molecular sieve was tested by roasting at 550°C for 5 hours in an air atmosphere to be 16.4% by weight, and the SiO of the...

Embodiment 2

[0059] Same as [Example 1], except:

[0060] b) 62.0 grams of synthesized molecular sieves with MWW structure, 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%, Na2 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 MWW structure 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.

[0061] c) Calcining the MWW structure molecular sieve catalyst precursor I prepared in step b) at 550° C. under air atmosphere for 6 hours to obtain the MWW structure molecular sieve catalyst precursor II.

[0062] d) Contact the MWW structure molecular sieve catalyst precursor II prepared in step c) with ammonium nitrate solution with a mass fraction of 15% at 60° C. for 3 times for 1 ...

Embodiment 3

[0064] Same as [Example 1], except:

[0065] b) 80.0 grams of synthetic molecular sieves with MWW structure, 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 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 bar-shaped molecular sieve catalyst precursor with a MWW structure molecular sieve content of 97.1 wt%, a binder content of 2.9 wt%, and a four-leaf clover cross section was prepared by extrusion.

[0066] c) Calcining the MWW structure molecular sieve catalyst precursor I prepared in step b) at 550° C. under air atmosphere for 6 hours to obtain the MWW structure molecular sieve catalyst precursor II.

[0067] d) Contact the MWW structure molecular sieve catalyst precursor II prepared in step c) with ammonium nitrate solution with a mass fraction of 15% at 60° C. for 3 times for 1 hour e...

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Abstract

The invention relates to a MWW structure molecular sieve catalyst, a preparation method and an application thereof. The MWW structure molecular sieve catalyst comprises the following components in parts by weight: a) 92-99 parts of a MWW structure 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 MWW structure molecular sieve catalyst, a preparation method and application. Background technique [0002] MWW structure molecular sieve is a general term for a class of molecular sieve materials with MWW structure sheet as the basic unit. The difference between MWW structure molecular sieves lies in the difference in layer spacing and layer-to-layer combination. One of the most important molecular sieves with a MWW structure is MCM-22. [0003] MCM-22 molecular sieve is a new type of silica-alumina molecular sieve material synthesized in 1990 by researchers from Mobil Corporation of the United States. The molecular sieve has two sets of independent 10-membered ring channel systems that are not connected to each other: a set of two-dimensional sinusoidal intersecting channels with an elliptical cross-section and a pore diameter of 0.41 nanometers × 0.51 nanometers; 5.5 nm, and the channel contains a cylindrical 12-membered...

Claims

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Application Information

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IPC IPC(8): B01J29/70C07C15/073C07C15/085C07C2/66
CPCB01J29/7038C07C2/66C07C2529/70C07C15/073C07C15/085Y02P20/52
Inventor 杨为民王振东孙洪敏张斌
Owner CHINA PETROLEUM & CHEM CORP