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Method for preparing gamma-Al2O3 powder with combustion method

A combustion method and powder technology, which is applied in the field of preparation of γ-Al2O3 powder materials, can solve the problems of particle agglomeration specific surface area, complex process, easy to mix impurities, etc., achieve short reaction time, simple process, and benefit fineness effect

Inactive Publication Date: 2012-06-13
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently preparing γ-Al 2 o 3 The methods mainly include: chemical precipitation method, sol-gel method, hydrothermal method, microemulsion method, etc. Some of these methods have complex processes and are easy to mix impurities; some synthetic products have large particle size and serious particle agglomeration And the specific surface area is generally low, etc.

Method used

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  • Method for preparing gamma-Al2O3 powder with combustion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0012] Weigh a certain amount of Al(NO 3 ) 3 9H 2 o 3 and C 2 h 5 NO 2 , so that Al(NO 3 ) 3 9H 2 o 3 with C 2 h 5 NO 2 The molar ratio of the mixture is 1:1, mixed in a ceramic crucible, and an appropriate amount of distilled water is added, the mixed solution is heated to 70°C with a heated magnetic stirrer and stirred evenly, and ammonia water is added dropwise to the solution to adjust the pH of the solution. 2. Dry in an oven at 110°C for 2 hours to obtain a sol, heat it in a muffle furnace to self-propagating combustion, and continue heating to 800°C for 3 hours, and the XRD spectrum analysis results show that the product is γ-Al 2 o 3 .

Embodiment approach 2

[0014] Weigh a certain amount of Al(NO 3 ) 3 9H 2 o 3 and C 2 h 5 NO 2 , so that Al(NO 3 ) 3 9H 2 o 3 with C 2 h 5 NO 2 The molar ratio of the mixture is 1:1, mixed in a ceramic crucible, and an appropriate amount of distilled water is added, the mixed solution is heated to 70°C with a heated magnetic stirrer and stirred evenly, and ammonia water is added dropwise to the solution to adjust the pH of the solution. 1. Dry in an oven at 110°C for 2 hours to obtain a sol, heat it in a muffle furnace to self-propagating combustion, and continue to heat to 750°C for 4 hours, and the XRD spectrum analysis results show that the product is γ-Al 2 o 3 .

Embodiment approach 3

[0016] Weigh a certain amount of Al(NO 3 ) 3 9H 2 o 3 and C 2 h 5 NO 2 , so that Al(NO 3 ) 3 9H 2 o 3 with C 2 h 5 NO 2 The molar ratio of the mixture is 1:2, mixed in a ceramic crucible, and an appropriate amount of distilled water is added, the mixed solution is heated to 70°C with a heated magnetic stirrer and stirred evenly, then ammonia water is added dropwise to the solution to adjust the pH of the solution = 2. Dry in an oven at 110°C for 2 hours to obtain a sol, heat it in a muffle furnace to self-propagating combustion, and continue heating to 800°C for 2 hours, and the XRD spectrum analysis results show that the product is γ-Al 2 o 3 .

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Abstract

The invention relates to a method for preparing gamma-Al2O3 powder with a combustion method. According to the invention, the gamma-Al2O3 powder material prepared by using the method is short in reaction time; and the puffy gamma-Al2O3 powder product can be prepared by controlling raw material proportion and solution pH value and combining with calcining temperature and constant-temperature calcining time after self-spreading combustion. The raw materials of the gamma-Al2O3 powder comprise Al(NO3)3.9H2O3 and C2H5NO2. The method comprises the following steps of: mixing Al(NO3)3.9H2O3 with C2H5NO2 in a molar ratio of 1: (1-4) in a ceramic crucible, and then adding a proper amount of distilled water; heating a mixed solution with a magnetic stirring apparatus with a heating function to 70 DEG C and evenly stirring; dropwise adding ammonia water and regulating the pH value of the mixed solution to be between 1 and 3; drying for 2 hours in an oven at the temperature of 110 DEG C so as to obtain sol; and heating the sol in a muffle furnace until self-spreading combustion happens, and calcining for 1-4 hours at the temperature of 700-850 DEG C, so as to obtain the puffy powder product, namely, the gamma-Al2O3 powder.

Description

technical field [0001] The invention relates to a method for preparing γ-Al by combustion method 2 o 3 Powder method, belongs to γ-Al 2 o 3 The technical field of powder material preparation. Background technique [0002] Alumina (Al 2 o 3 ) is a widely used high-performance material with various crystal forms, γ-Al 2 o 3 is one of a kind. γ-Al 2 o 3 It is a porous solid material that belongs to the close-packed configuration of the cubic center, similar to the structure of spinel. Because of its large specific surface area and acidic surface, it is called "activated alumina", which is widely used in catalyst carriers, such as the carrier of hydrocracking, hydrodesulfurization and dehydrogenation catalysts in the field of petroleum refining; automobile Exhaust gas purification, catalyst carrier for polymer synthesis, etc. [0003] Currently preparing γ-Al 2 o 3 The methods mainly include: chemical precipitation method, sol-gel method, hydrothermal method, micro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30
Inventor 储刚
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY