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Modified nanometer ZSM-5 molecular sieve catalyst, preparation method and application thereof

A ZSM-5, catalyst technology, applied in the field of modified nano ZSM-5 molecular sieve catalyst and its preparation, can solve the problem of low xylene selectivity, and achieve the effects of prolonging catalyst life, high activity and low reaction temperature

Inactive Publication Date: 2008-04-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low selectivity of p-xylene in USP4,950,835 technology

Method used

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  • Modified nanometer ZSM-5 molecular sieve catalyst, preparation method and application thereof
  • Modified nanometer ZSM-5 molecular sieve catalyst, preparation method and application thereof
  • Modified nanometer ZSM-5 molecular sieve catalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The nanometer NaZSM-5 molecular sieve was exchanged with 0.5N ammonium nitrate solution at 80°C for 3 times for sodium ion exchange, each time for 2 hours. Washing with water, drying at 90-120°C, and roasting at 540°C for 5 hours to prepare nanometer HZSM-5 molecular sieve.

[0043] Reaction conditions: HC (HC is the sum of toluene and methanol) weight space velocity 2h -1 ; Toluene / methanol (mol / mol): 2 / 1; Temperature: 410°C; Atmospheric pressure: H 2 / HC (mol / mol): 8.5. The obtained toluene conversion rate was 38.91%, and the p-xylene selectivity was 76.36%.

[0044] Micron HZSM-5 prepared by the same method, under the same reaction conditions, the conversion rate of toluene is 36.43%, and the selectivity of p-xylene is 76.46%.

Embodiment 2

[0046] The nano HZSM-5 molecular sieve prepared in Example 1 was impregnated with a rare earth solution with a mass ratio of molecular sieve to rare earth of 100:25, dried, and roasted to obtain a rare earth modified nano ZSM-5 molecular sieve. For toluene, methanol alkylation reaction.

[0047] Reaction conditions: HC weight space velocity 2h -1 ; Toluene / methanol (mol / mol): 2 / 1; Temperature: 410°C; Atmospheric pressure: H 2 / HC (mol / mol): 8.5. The obtained toluene conversion rate is 32.80%, and the p-xylene selectivity is 76.65%.

Embodiment 3

[0049] The rare earth modified nano ZSM-5 molecular sieve prepared in Example 2 was impregnated with magnesium acetate solution at room temperature for 5-15 hours, dried and roasted to obtain modified catalysts loaded with 10%, 15%, and 20% MgO respectively , Tablet molding. The effect of different MgO loadings on the catalyst performance was investigated.

[0050] Reaction conditions: HC weight space velocity 2h -1 ; Toluene / methanol (mol / mol): 2 / 1; Temperature: 410°C; Atmospheric pressure: H 2 / HC (mol / mol): 8.5. The reaction results showed that as the MgO loading increased from 10% to 20%, the toluene conversion rate was 26.11-25.14%, and the p-xylene selectivity was 93.35-95.63% (see Table 1).

[0051] In the same way, modified micron ZSM-5 catalysts loaded with 10%, 15%, and 20% MgO were prepared respectively. Under the same reaction conditions, the reaction results were as follows: as the MgO loading increased from 10% to 20%, the toluene conversion The rate is 24.43...

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Abstract

The invention relates to a kind of modifying nanometer ZSM-5 molecular-sieve catalyst and its manufacturing method, and it also can be used to produce para-xylene by base reaction with toluene and alkane methoxide. The catalyst uses the nanometer ZSM-5 molecular-sieve as the parent, and uses aluminium oxide, mixed rare earth and their community as the supporter respectively. The active component modifier, such as the oxidate loading La, Mg or Si, undergoes dipping, desiccating and roasting, and then as a result the catalyst can be acquired. In the reaction that toluene and alkane methoxide producing para-xylene, the catalyst has the advantages of the high selectivity, excellent activity and stability and so on.

Description

technical field [0001] The invention relates to a modified nano ZSM-5 molecular sieve catalyst used in the alkylation of toluene and methanol to produce p-xylene and a preparation method thereof. Background technique [0002] Alkylation of toluene and methanol to produce p-xylene technology: Chinese patent 94110202.5 uses magnesium-mixed rare earth modified ZSM-5 catalyst. The ZSM-5 molecular sieve synthesized with ammonia water as a template has a rare earth weight content of 10-40%, a MgO load of 1.7-4.0%, and the reaction conditions are: toluene, methanol molar ratio 2:1, temperature 465 ° C, toluene weight The airspeed is 2h-1. Toluene conversion 16.0-17.9. The selectivity to p-xylene is 91.6-95.6%. The ZSM-5 molecular sieve synthesized by using ethylenediamine as a template is mixed with rare earth at a ratio of 80% and 20%, and loaded with 3% MgO to prepare a modified catalyst. The reaction conditions are: the molar ratio of toluene and methanol is 2, and the temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C15/08
CPCY02P20/52
Inventor 王祥生丁春华郭新闻
Owner DALIAN UNIV OF TECH
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