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Zeolite molecular sieve catalyst and preparation method thereof

A technology of zeolite molecular sieve and catalyst, which is applied in the field of zeolite molecular sieve catalyst and its preparation, and can solve the problems of low selectivity and short service life of low-carbon olefins

Inactive Publication Date: 2012-03-21
SHANGHAI FUYU NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst is a composite molecular sieve catalyst. In the MTP reaction, it overcomes the shortcomings of the short service life of the high SAR H-ZSM-5 zeolite molecular sieve catalyst alone, and solves the problem of low-carbon olefins as the main product of the low SAR H-ZSM-5 zeolite molecular sieve catalyst alone. Disadvantages of low selectivity

Method used

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  • Zeolite molecular sieve catalyst and preparation method thereof
  • Zeolite molecular sieve catalyst and preparation method thereof
  • Zeolite molecular sieve catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] SAR=255H-ZSM-5 zeolite molecular sieve powder crystal produced by Shanghai Fuxu Molecular Sieve Co., Ltd., after being pressed into tablets, 5mL of 20-40 mesh particles were taken as a catalyst and packed in a catalytic evaluation reactor at 480 Reaction under the condition of ℃, the mass concentration of methanol is 33%, and the hourly space velocity of methanol liquid is 1h -1 . The average value of its 100-hour methanol dehydration to propylene (MTP) reaction product selectivity is shown in Example 1 in Table 1.

Embodiment 2

[0024] Take 1.92 grams of the raw material solution, dilute it to 15 grams with deionized water and mix it with 10 g of H-ZSM-5 zeolite molecular sieve powder crystals used in Example 1 to form a uniform slurry, which is reacted in a 40 mL autoclave at 180 ° C After 3 hours, the product was filtered, washed, dried, and calcined at 550°C for 6 hours to remove the organic template agent, and the composite zeolite molecular sieve powder crystal was obtained. After tablet molding, 5 mL of 20-40 mesh particles were collected as a catalyst after being crushed and screened, and packed in a catalytic evaluation reactor. The mass ratio of the H-ZSM-5 zeolite molecular sieve to the Silicalite-I zeolite molecular sieve in the catalyst is calculated to be 100:1. The average value of its 100-hour methanol dehydration to propylene (MTP) reaction product selectivity is shown in Example 2 in Table 1.

Embodiment 3

[0026] Take 0.96 g of the raw material solution, dilute it to 15 g with deionized water and mix it with 10 g of the H-ZSM-5 zeolite molecular sieve powder used in Example 1 to form a uniform slurry, which is reacted in a 40 mL autoclave at 180 ° C After 2 hours, the product was filtered, washed, dried, and calcined at 550°C for 6 hours to remove the organic template agent, and the compound zeolite molecular sieve powder crystal was obtained. After tablet molding, 5 mL of 20-40 mesh particles were collected as a catalyst after being crushed and screened, and packed in a catalytic evaluation reactor. The mass ratio of the H-ZSM-5 zeolite molecular sieve to the Silicalite-I zeolite molecular sieve in the catalyst is calculated to be 200:1. The average value of its 100-hour methanol dehydration to propylene (MTP) reaction product selectivity is shown in Example 3 in Table 1.

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Abstract

The invention belongs to the technical field of catalyst, in particular to a zeolite molecular sieve catalyst and a preparation method thereof. The zeolite molecular sieve adopted by the catalyst is formed by compounding H-ZSM-5 with Silicalite-I. The inner core of the composite zeolite molecular sieve is H-ZSM-5 zeolite molecular sieve crystals, and the Silicalite-I zeolite molecular sieve is arranged on the outer surfaces of the crystals. The preparation method of the catalyst of the invention comprises the following steps: reacting in reactant liquid formed by ethyl orthosilicate or gas-phase white carbon black which is adopted as a silicon source and tetrapropylammonium hydroxide which is adopted as guide agent at 160-180 degrees centigrade for 1-6 h under the hot water condition; after growing the surface of the Silicalite-I zeolite molecular sieve outside the surface of the H-ZSM-5 zeolite molecular sieve crystals, filtering, washing, drying, baking and moulding the surfaces of the crystals to obtain the catalyst. The catalyst of the invention is applied to MTP reaction, and has the advantages of high selectivity of light olefins and long service time.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a zeolite molecular sieve catalyst and a preparation method thereof. Background technique [0002] ZSM-5 zeolite molecular sieve is a high-silica zeolite molecular sieve with aluminum-containing framework. It has two-dimensional ten-membered ring channels, that is, ten-membered ring straight channels with a pore size of 0.54nm×0.56nm and ten-membered ring sinusoidal channels with a pore size of 0.51nm. ×0.54nm. The zeolite molecular sieve was developed by Mobil Corporation in 1972 [U.S. Patent 3702886, 1972]. The desodium hydrogen type ZSM-5 (H-ZSM-5) zeolite molecular sieve crystal framework structure has high thermal and hydrothermal stability, the silicon-aluminum molar ratio (SAR) of the framework can be adjusted, and the surface has strong acidity. It has high activity and selectivity to the reaction product. Therefore, it is used as one of the important act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C1/24C07C11/06
CPCY02P20/52
Inventor 龙英才郭娟汪靖
Owner SHANGHAI FUYU NEW MATERIAL TECH
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