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Modification method of Y-type molecular sieve

A molecular sieve and modification technology, applied in molecular sieve catalysts, chemical instruments and methods, petroleum industry, etc., can solve the problems of small change in pore structure, low cracking activity, blocking of zeolite pore structure, etc., and achieve low production cost and high activity. , the effect of high heat and hydrothermal stability

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

In order to avoid metal ion damage to the zeolite framework structure during the preparation process, Wang Yangdong et al. used butyl titanate / absolute ethanol solution to impregnate USY zeolite to prepare titanium-containing USY zeolite. When the Ti content was small (≤4.8% TiO 2 ), Ti is highly dispersed on the surface of the zeolite, and the pore structure changes little; when the Ti content is high, TiO 2 Diffraction peaks will block the pore structure of zeolite; Ti is mainly combined with silanol on the surface of zeolite in the form of monodentate or bidentate ("Preparation and Characterization of Titanium-Containing USY Zeolite", Acta Chemical Sinica, 2000, 58 (6)), this method is in Molecular sieves are prepared in organic solvents, and the prepared molecular sieves are used for catalytic cracking, and their cracking activity is not high

Method used

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  • Modification method of Y-type molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 27.9g zirconium nitrate Zr(NO 3 ) 4 ·5H 2 O was dissolved in 500g deionized water, stirred evenly, and the pH value of the mixture was adjusted to 4.5 with dilute ammonia water at 26°C, then the temperature was raised to 40°C, and stirred for 60min; 200g (dry basis weight) of DY1-1 molecular sieve provided in Comparative Example 1 was taken ) into the above mixture, fully stirred at 40°C for 2 hours; after filtration, the resulting filter cake was roasted at 650°C and 100% water vapor for 2 hours to obtain a zirconium-modified Y molecular sieve, denoted as Y1, its properties See Table 1.

Embodiment 2

[0036] Dissolve 51.2g of tetrabutyl titanate in 800g of deionized water, stir evenly, adjust the pH value of the mixture to 6.0 with dilute ammonia water, then stir at room temperature for 30min; take 200g of DY1-1 molecular sieve provided in Comparative Example 1 (dry Basis weight) was added to the above mixture, heated to 60°C, and continued to stir for 1 hour; after filtration, the resulting filter cake was roasted at 500°C and 100% water vapor for 3 hours to obtain a titanium-modified Y molecular sieve, denoted as Y2 , whose properties are shown in Table 1.

Embodiment 3

[0038] 10.5g zirconium oxychloride ZrOCl 2 ·8H 2 Dissolve O in 1800g deionized water, stir well, adjust the pH value of the mixture to 7.0 with dilute ammonia water, raise the temperature to 80°C, and stir for 20min; take 200g (dry weight) of DASY (0.0) molecular sieves and add them to the above mixture, at 80 Stirring was continued for 2 hours at °C; after filtration, the obtained filter cake was roasted at 450 °C and 100% water vapor for 5 hours to obtain a zirconium-modified Y molecular sieve, which was denoted as Y3, and its properties are shown in Table 1.

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Abstract

A modification method of Y-type molecular sieve comprises the following steps: (1) dispersing a compound containing titanium and / or zirconium into water, and adjusting pH value of the mixture to 3-10; (2) mixing molecular sieve and the mixture obtained in the Step (1), and stirring; and optionally filtering and / or drying; and (3) roasting at 300-700 DEG C. By the modification method of Y-type molecular sieve, production cost is low, and the modified Y-type molecular sieve obtained has high thermal and hydrothermal stability.

Description

technical field [0001] The invention relates to a method for modifying a Y-type molecular sieve. Background technique [0002] Molecular sieve is a widely used material in catalytic cracking catalyst, and it is also a very important component. The performance of molecular sieve directly affects the reaction performance of catalytic cracking catalyst. According to different needs, molecular sieves can be modified differently to meet the requirements of use. For example, the modification of molecular sieves with rare earth ions is beneficial to improve the stability and cracking activity of molecular sieves, and has been widely used for a long time. However, as an important strategic resource and its non-renewability, rare earths have caused fluctuations in the price of rare earths in recent years, which has increased the cost of FCC catalysts. How to reduce the rare earth content in FCC catalysts has become an urgent problem to be solved. Therefore, it is desirable to intr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08C10G11/05
Inventor 于善青田辉平王振波许明德
Owner CHINA PETROLEUM & CHEM CORP
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