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A kind of stepped pore macroporous-mesoporous alumina carrier and its preparation method

A technology of mesoporous alumina and stepped pores, which is applied in the direction of catalyst carrier, chemical instrument and method, catalyst activation/preparation, etc. It can solve the complex preparation process of alumina materials containing impurities, and it is difficult to prepare high-performance alumina materials, etc. Problems, to achieve short reaction cycle, improve circulation and diffusion performance, and slow down the effect of carbon deposition and deactivation rate

Active Publication Date: 2020-06-09
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The alumina material prepared by using aluminum amalgam contains impurities and the preparation process is complicated; it is difficult to prepare high-performance alumina materials with a stepped pore structure by general acid and alkali methods

Method used

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  • A kind of stepped pore macroporous-mesoporous alumina carrier and its preparation method
  • A kind of stepped pore macroporous-mesoporous alumina carrier and its preparation method
  • A kind of stepped pore macroporous-mesoporous alumina carrier and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] This embodiment provides a method for preparing a stepped pore macroporous-mesoporous alumina carrier, comprising the following steps:

[0041] Add 20 mL of sec-butanol solution with a mass fraction of 99.5% in the beaker, and add 6 mL of deionized water into the beaker, mix well, take the supernatant, and add 2 g of aluminum sec-butoxide solution evenly dropwise to the supernatant (97wt%), generate white precipitate, after slowly stirring 3min with glass rod, leave standstill 3min, then stir 10min;

[0042] The product was subjected to suction filtration, and the product obtained by suction filtration was placed in an oven at 60°C and left to stand for 12 hours to obtain a white powder;

[0043] The powder is calcined in a muffle furnace at a high temperature of 550° C. for 4 hours to obtain a stepped-pore macroporous-mesoporous alumina carrier.

[0044] figure 1 For the X-ray diffraction pattern of the product obtained in this example, the main diffraction peaks of ...

Embodiment 2

[0046] This embodiment provides a method for preparing a stepped pore macroporous-mesoporous alumina carrier, comprising the following steps:

[0047]Adding 20mL of mass fraction in the beaker is 99.5% butanol solution, and adding 4mL of deionized water in the beaker, after mixing evenly, get the supernatant, and evenly dropwise add 2g of aluminum sec-butoxide solution in the supernatant ( 97wt%), generate a white precipitate, after slowly stirring with a glass rod for 3min, leave it for 3min, and then stir for 10min;

[0048] The product was subjected to suction filtration, and the product obtained by suction filtration was placed in an oven at 60°C and left to stand for 12 hours to obtain a white powder;

[0049] The powder was calcined in a muffle furnace at a high temperature of 550° C. for 6 hours to obtain a stepped macroporous-mesoporous alumina carrier.

[0050] Figure 2a (5μm) and Figure 2b (1 μm) is the scanning electron microscope image of the carrier in this e...

Embodiment 3

[0052] This embodiment provides a method for preparing a stepped pore macroporous-mesoporous alumina carrier, comprising the following steps:

[0053] Adding 20mL of mass fraction in the beaker is 99.5% butanol solution, and in the beaker, add 3mL of deionized water, get the supernatant after mixing evenly, and evenly drop 2g of aluminum sec-butoxide solution in the supernatant ( 97wt%), generate a white precipitate, after slowly stirring with a glass rod for 3min, leave it for 3min, and then stir for 10min;

[0054] The product was subjected to suction filtration, and the product obtained by suction filtration was placed in an oven at 60°C and left to stand for 12 hours to obtain a white powder;

[0055] The powder was calcined in a muffle furnace at a high temperature of 550° C. for 4 hours to obtain a stepped-pore macroporous-mesoporous alumina carrier.

[0056] image 3 This is the nitrogen adsorption-desorption isotherm curve of the carrier in this example, and the exis...

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Abstract

The invention provides a stepped pore macroporous-mesoporous alumina carrier and a preparation method thereof. The preparation method includes: dropping organic aluminum alkoxide into an aqueous solution of organic solvent under stirring, and leaving it standing to obtain a white precipitate; the molar ratio of organic aluminum alkoxide and organic solvent is 0.001-0.05:1; performing suction filtration of the white precipitate , dry to obtain a powder; the powder is roasted to obtain a stepped pore macroporous-mesoporous alumina carrier. The present invention also provides a stepped pore macroporous-mesoporous alumina carrier obtained by the above preparation method. The above preparation method of the present invention has a simple process, a short synthesis cycle, and the obtained alumina carrier has a large specific surface area.

Description

technical field [0001] The invention relates to a method for preparing an alumina carrier, in particular to a method for preparing an alumina carrier with stepped pores from macropores to mesopores, and belongs to the technical field of carrier material preparation. Background technique [0002] Alumina is an extremely important chemical raw material. In addition to being used to refine metal aluminum, it is also widely used in ceramics, medicine, adsorption materials and as a catalyst carrier. Porous alumina used as a catalyst and carrier is generally called activated alumina. It is a solid material with porosity and high dispersion. It has a large specific surface area, and the pores and surface acidity can be adjusted. [0003] Especially the macroporous-mesoporous Al with excellent pore structure and channel properties 2 o 3 material, because of its large specific surface area, good adsorption performance, good acidity and thermal stability, etc., as an excellent catal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/04B01J35/10B01J37/03B01J32/00B01J37/08
CPCB01J21/04B01J37/033B01J37/08B01J35/60B01J35/64
Inventor 邢昕李兆飞苏宝连陈丽华汪建南郭成玉刘其武郭广娟王骞庞新梅
Owner PETROCHINA CO LTD
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