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Spherical catalyst carrier containing molecular sieve and alumina and its preparation and application

A catalyst carrier, molecular sieve technology, applied in molecular sieve catalysts, catalyst carriers, physical/chemical process catalysts, etc., can solve problems such as gaps, and achieve the effects of good spherical sphericity, colloidal stability and high strength

Active Publication Date: 2022-05-17
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxidative dehydrogenation and membrane reaction dehydrogenation are still far from industrialization

Method used

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  • Spherical catalyst carrier containing molecular sieve and alumina and its preparation and application
  • Spherical catalyst carrier containing molecular sieve and alumina and its preparation and application
  • Spherical catalyst carrier containing molecular sieve and alumina and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation process of the spherical catalyst carrier containing molecular sieve and alumina in this embodiment is as follows:

[0030] 1. Dissolve 375g of aluminum nitrate in 500g of deionized water at 60°C, add 7% ammonia solution under airtight conditions until the pH value is between 7 and 8, and then wash under pressure filter conditions until the filtrate is neutral. Wet filter cake: add deionized water to the wet filter cake and stir evenly, add nitric acid solution with a concentration of 50% for peptization, control the pH value of the sol at 4.0, and finally the solid content of the sol is 35%;

[0031] 2. Mix 100g of macroporous pseudo-boehmite and 60g of ZSM-5 (silicon-aluminum ratio 200) molecular sieve, add deionized water and carry out ball milling, the total solids of pseudo-boehmite and molecular sieve in the suspension after ball milling The content is 50%, and the particle D90 in the suspension after ball milling is 30nm.

[0032] 3. Add the susp...

Embodiment 2

[0036] The preparation process of the spherical catalyst carrier containing molecular sieve and alumina in this embodiment is as follows:

[0037] 1. Dissolve 270g of aluminum nitrate in 500g of deionized water at 80°C, add 7% ammonia solution under airtight conditions until the pH value is between 7 and 8, and then wash under pressure filter conditions until the filtrate is neutral. Wet filter cake: add deionized water to the wet filter cake and stir evenly, add nitric acid solution with a concentration of 30% for peptization, control the pH value of the sol at 3.5, and finally the solid content of the sol is 25%;

[0038]2. After mixing 80g of macroporous pseudo-boehmite and 70g of ZSM-5 (silicon-aluminum ratio 100) molecular sieve, add deionized water and carry out ball milling, so that the total amount of pseudo-boehmite and molecular sieve in the suspension after ball milling is The solid content is 35%, and the particle D90 in the suspension after ball milling is 25nm. ...

Embodiment 3

[0043] The preparation process of the spherical catalyst carrier containing molecular sieve and alumina in this embodiment is as follows:

[0044] 1. Dissolve 150g of anhydrous aluminum chloride in 650g of deionized water at 50°C, add 10% ammonia solution under airtight conditions until the pH value is between 7 and 8, and then wash under pressure filter conditions until the filtrate is neutral to obtain a wet filter cake; add deionized water to the wet filter cake and stir evenly, add nitric acid solution with a concentration of 40% for peptization, control the pH value of the sol at 3.0, and finally the solid content of the sol is 28%;

[0045] 2. After mixing 150g of macroporous pseudo-boehmite and 80g of SPAO-34 (silicon-aluminum ratio 0.4) molecular sieve, add deionized water and carry out ball milling, so that the total amount of pseudo-boehmite and molecular sieve in the suspension after ball milling The solid content is 40%, and the particle D90 in the suspension after...

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Abstract

The invention provides a spherical catalyst carrier containing molecular sieve and alumina, which belongs to the technical field of catalysts. The catalyst carrier is obtained by precipitating inorganic aluminum salt through ammonia water and acidifying to obtain a sol, adding a mixed solution of ball-milled pseudo-boehmite and molecular sieve and a sol modification auxiliary agent to the sol, and then dripping balls into an oil ammonia column for aging, Finally, after washing, drying and calcining, composite pellets with high strength and large specific surface are obtained. The invention also provides the preparation method and application of the spherical catalyst carrier. In the present invention, the slurry obtained after ball milling pseudo-boehmite and molecular sieve is mixed with dilute sol and peptized again to obtain a sol in which molecular sieve and alumina particles are uniformly dispersed; adding a sol modifier to the sol makes the colloid more stable , the microscopic particle distribution of the formed sphere is more uniform, and the sphericity is better. When the spherical catalyst carrier of the invention is used in the preparation of a low-carbon alkane dehydrogenation catalyst, the dehydrogenation activity, olefin selectivity and carbon deposition resistance are good.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a spherical catalyst carrier containing molecular sieves and alumina and its preparation and application. Background technique [0002] The technology of dehydrogenating small molecular saturated hydrocarbons to produce olefins has been industrialized as early as the 1930s. However, due to the development of oil refining technology after World War II, the by-product propylene of steam cracking is enough to meet market demand, leading to the technical route of alkane dehydrogenation Not taken seriously. In the past ten years, with the rapid development of the shale gas industry in the world, its by-product condensate has provided a large amount of cheap ethane and propane resources for the world. Propane production is also growing. Therefore, people began to pay attention to the dehydrogenation technology of low-carbon alkanes again. There are three types of alkane dehydrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40B01J29/70B01J32/00B01J35/02B01J35/10C07C11/06C07C5/333B01J35/00
CPCB01J29/40B01J29/7015B01J29/7007C07C5/333B01J35/40B01J35/61C07C11/06Y02P20/52
Inventor 韩伟潘相米梁衡艾珍吴砚会李南锌李扬何霖
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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