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Binderless ZSM-5/beta zeolite symbiotic molecular sieve catalyst and preparation method thereof

A ZSM-5, symbiotic molecular sieve technology, applied in molecular sieve catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of low activity, poor strength, low activity of mechanical mixtures, etc., and achieve improved activity and high strength. , the effect of combining

Active Publication Date: 2012-09-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] One of the technical problems to be solved by the present invention is that the existing ZSM-5 / beta zeolite intergrowth molecular sieve catalyst has low activity when binder is contained, and the ZSM-5 / beta zeolite intergrowth molecular sieve without binder has poor strength and contains The problem of low activity of mechanical mixtures of ZSM-5 and zeolite beta with binder, providing a new binder-free ZSM-5 / zeolite beta intergrowth molecular sieve catalyst

Method used

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  • Binderless ZSM-5/beta zeolite symbiotic molecular sieve catalyst and preparation method thereof
  • Binderless ZSM-5/beta zeolite symbiotic molecular sieve catalyst and preparation method thereof
  • Binderless ZSM-5/beta zeolite symbiotic molecular sieve catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take SiO 2 / Al 2 o 3 Mole ratio is 60 grams of ZSM-5 molecular sieves of 40, adding 40 grams of silica sol and 16 grams of aluminum sulfate with a weight percentage of 40%, after mixing and stirring evenly, add 10 milliliters of 1 mol / liter sodium hydroxide solution, Mix and stir evenly, then extrude into strips, and dry the shaped catalyst at 80°C for 3 hours, then put it into a 200ml autoclave containing 40 grams of a mixed solution of water and tetraethylammonium bromide in the bottom layer of the liner with a mass ratio of 1:1 In the process, the catalyst and liquid water are not in contact. After the autoclave is sealed, put it into the oven, take it out after crystallization at 160°C for 60 hours, then wash it twice, put it in the oven and dry it at 120°C for 3 hours, and put it in the muffle furnace. Heating at 400°C for 2 hours and 550°C for 3 hours to obtain a binder-free ZSM-5 / beta zeolite symbiotic molecular sieve catalyst, wherein the weight percentage of ZS...

Embodiment 2～6

[0030] According to the method of embodiment 1, get SiO respectively 2 / Al 2 o 3 ZSM-5 molecular sieves with molar ratios of 20, 40, 60, 80 and 100 were used as seed crystals, and other conditions were unchanged, and the ratio of raw material composition was shown in Table 1. Catalysts are shown in Table 2.

Embodiment 7～13

[0032] According to the method of Example 1, other conditions remain unchanged, add soluble starch, turnip powder or methyl cellulose in the molding process, the composition ratio of raw materials is shown in Table 1, mix and stir evenly, extrude and form, and then according to the embodiment 1 to make binder-free ZSM-5 / beta zeolite intergrowth molecular sieve catalyst, the results are shown in Table 2.

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Abstract

The invention relates to a preparation method of a binderless ZSM-5 / beta zeolite symbiotic molecular sieve catalyst, mainly solving the problems of the prior art, i.e. a ZSM-5 / beta zeolite symbiotic molecular sieve catalyst has lower activity in case of containing a binder and has poor strength in case of lacking a binder, and a mechanical mixture of the ZSM-5 containing the binder and beta zeolite has lower activity. By adopting the technical scheme that the ZSM-5 / beta zeolite symbiotic molecular sieve contains a binderless ZSM-5 / beta zeolite symbiotic molecular sieve catalyst with the mol ratio of SiO2 / Al2O3 of 20-200, wherein the weight content of a binder is 0-5 percent; the weight ratio of the ZSM-5 to the beta zeolite in the ZSM-5 / beta zeolite symbiotic molecular sieve is (0.15-100): 1, and the formed and roasted catalyst has the mechanical strength of 50-200N / g, the invention favorably solves the problems, and the prepared ZSM-5 / beta zeolite symbiotic molecular sieve catalyst can be used in a reaction for preparing propylene by catalytically cracking naphtha.

Description

technical field [0001] The invention relates to a binder-free ZSM-5 / beta zeolite symbiotic molecular sieve catalyst and a preparation method thereof. Background technique [0002] Molecular sieves are widely used in petrochemical and other fields because of their uniform and regular pore structure, large specific surface area and high thermal stability, and good shape-selective catalytic performance and adsorption performance. Because molecular sieve powder itself has low strength and is easy to disperse and lose, it cannot be directly applied in industry. Therefore, it is necessary to add a binder during molding to increase the strength. In the molded catalyst, because the binder wraps the molecular sieve, resulting in The effective utilization rate of molecular sieves decreases, and the pores of some molecular sieves are blocked, resulting in low specific surface area and low activity of the catalyst. Because the binder has an irregular pore structure, it is difficult for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80B01J29/70B01J29/40B01J37/00C07C11/06C07C11/04C07C4/06
CPCY02P20/52
Inventor 马广伟汪哲明肖景娴
Owner CHINA PETROLEUM & CHEM CORP