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Binder-free mordenite/beta zeolite coexisting molecular sieve catalyst and preparation method thereof

A symbiotic molecular sieve and mordenite technology, which is applied in the direction of molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low activity, low activity, and poor strength of mechanical mixtures, achieve tight combination, improve activity, The effect of increasing content

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 mordenite / beta zeolite intergrowth molecular sieve catalysts have low activity when binders are contained, and the mordenite / beta zeolite intergrowth molecular sieves without binders have poor strength and contain binders. In view of the low activity of mechanical mixtures of mordenite and beta zeolite, a new binder-free mordenite / beta zeolite intergrowth molecular sieve catalyst is provided

Method used

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  • Binder-free mordenite/beta zeolite coexisting molecular sieve catalyst and preparation method thereof
  • Binder-free mordenite/beta zeolite coexisting molecular sieve catalyst and preparation method thereof
  • Binder-free mordenite/beta zeolite coexisting molecular sieve catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Take SiO 2 / Al 2 o 360 grams of mordenite with a molar ratio of 20, add 40 grams of silica sol and 16 grams of aluminum sulfate with a mass percentage of 40%, mix and stir evenly, then add 10 milliliters of 1 mol / liter sodium hydroxide solution, mix and stir Evenly, then the agent bar is molded, and the molded catalyst is dried at 80°C for 3 hours, and then put into an autoclave with 200 milliliters of 40 grams of a mixed solution of 40 grams of mixed solution with tetraethylammonium bromide in a weight ratio of 1:1 at the bottom of the liner, 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 170°C for 60 hours, then wash it twice, put it in the oven for 3 hours at 120°C, and put it into the muffle furnace for 400°C. ℃ for 2 hours, and 550 ℃ for 3 hours to prepare a binder-free mordenite / beta zeolite intergrowth molecular sieve catalyst. Wherein the weight percentage of mordenit...

Embodiment 2～6

[0029] According to the method of embodiment 1, get SiO respectively 2 / Al 2 o 3 Mordenite with a molar ratio of 10, 20, 30, 40 and 20 was used as the seed crystal, and other conditions were kept constant.

Embodiment 7～13

[0031] 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 prepare binder-free mordenite / beta zeolite intergrowth molecular sieve catalyst, the results are shown in Table 2.

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Abstract

The invention relates to a method for preparing a binder-free mordenite / beta zeolite coexisting molecular sieve catalyst, which mainly solves the problems that the conventional mordenite / beta zeolite coexisting molecular sieve catalyst containing a binder has low activity, the binder-free mordenite / beta zeolite coexisting molecular sieve the has low strength and a binder-containing mechanical mixture of the mordenite and beta zeolite has low activity. The binder-free mordenite / beta zeolite coexisting molecular sieve catalyst contains mordenite / beta zeolite coexisting molecular sieves in whichthe molar ratio of SiO2 to Al2O3 is 20-100, wherein the binder is 0 to 5 weight percent; the weight ratio of the mordenite to the beta zeolite in the mordenite / beta zeolite coexisting molecular sieves is 0.2-100:1; and the mechanical strength of the formed catalyst is 50-200 Newton / grain; therefore, the technical scheme better solves the problems, and the prepared binder-free mordenite / beta zeolite coexisting molecular sieve catalyst can be applied to reaction for preparing propylene by catalytic cracking of naphtha.

Description

technical field [0001] The invention relates to a binder-free mordenite / 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80B01J29/70B01J29/18C07C11/06C07C11/04C07C4/06
CPCY02P20/52
Inventor 马广伟金文清任丽萍
Owner CHINA PETROLEUM & CHEM CORP