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Binderless MCM-22 / MCM-49 co-formed molecular sieve catalyst and preparation method thereof

A technology of MCM-49 and MCM-22, applied in the field of binderless MCM-22/MCM-49 symbiotic molecular sieve catalyst and its preparation, can solve the problems of low activity, low activity of mechanical mixture, poor strength, etc. Active, tightly bound, high-strength effect

Active Publication Date: 2012-07-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is that the existing MCM-22 / MCM-49 symbiotic molecular sieve catalyst has low activity when binder is contained, and the MCM-22 / MCM-49 symbiotic molecular sieve without binder has poor strength As well as the low activity of the mechanical mixture of MCM-49 and MCM-22 molecular sieves containing binders, a new binder-free MCM-22 / MCM-49 symbiotic molecular sieve catalyst is provided

Method used

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  • Binderless MCM-22 / MCM-49 co-formed molecular sieve catalyst and preparation method thereof
  • Binderless MCM-22 / MCM-49 co-formed molecular sieve catalyst and preparation method thereof
  • Binderless MCM-22 / MCM-49 co-formed molecular sieve catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take SiO 2 / Al 2 o 360 grams of MCM-22 / MCM-49 symbiotic molecular sieve with a molar ratio of 20, add 40 grams of silica sol and 16 grams of aluminum sulfate with a weight percentage of 40%, mix and stir evenly, and then add 1 mol / liter of hydroxide 10 milliliters of sodium solution, mixed and stirred evenly, and then shaped into strips, and the molded catalyst was dried at 80°C for 3 hours, and then put into 40 grams of a mixed solution containing water and hexamethyleneimine at a weight ratio of 1:1 at the bottom of the liner In a 200ml autoclave, 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 165°C for 60 hours, then wash it with water twice, put it in the oven and dry it at 120°C for 3 hours, and put it in the oven. In a muffle furnace, the temperature was programmed to rise at 400°C for 2 hours, and at 550°C for 3 hours to prepare the binder-free MCM-22 / MCM-49 symbiotic m...

Embodiment 2～6

[0027] According to the method of embodiment 1, get SiO respectively 2 / Al 2 o 3 MCM-22 / MCM-49 symbiotic molecular sieves with molar ratios of 20, 40, 60, 80 and 100 were used as seed crystals, and other conditions were constant. 2 shown.

Embodiment 7～13

[0029] 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 MCM-22 / MCM-49 intergrowth molecular sieve catalyst, the results are shown in Table 2.

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Abstract

The present invention relates to a preparation method of a binderless MCM-22 / MCM-49 co-formed molecular sieve catalyst, and is aimed to solve the problems that existing binder-containing MCM-22 / MCM-49 co-formed molecular sieve catalysts have low activity, binderless MCM-22 / MCM-49 co-formed molecular sieves have poor strength, and mechanical mixtures of binder-containing MCM-22 / MCM-49 co-formed molecular sieves have low activity. Thus the present invention provides a binderless MCM-22 / MCM-49 co-formed molecular sieve catalyst, wherein the molar ratio of SiO2 / Al2O3 in the MCM-22 / MCM-49 co-formed molecular sieve is 20-120; the content of the binder is 0-5wt%; the weight ratio of MCM-49 to MCM-22 in the MCM-22 / MCM-49 co-formed molecular sieve is 0.15-80:1; the mechanical strength of the shaped catalyst is 50-180 Newton / particle. The prepared binderless MCM-22 / MCM-49 co-formed molecular sieve catalyst is applicable to the industrial production of propylene by catalytic cracking of naphtha.

Description

technical field [0001] The invention relates to a binder-free MCM-22 / MCM-49 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 the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80B01J37/00C10G11/05
Inventor 马广伟肖景娴
Owner CHINA PETROLEUM & CHEM CORP