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Process for preparing catalysis nano Al2O3 by using starch gel-

A uniform precipitation and starch technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of particle agglomeration and achieve the effects of avoiding pollution, low cost and high output

Inactive Publication Date: 2010-11-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The biggest problem in the process of powder preparation by liquid phase method is the agglomeration of particles

Method used

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  • Process for preparing catalysis nano Al2O3 by using starch gel-
  • Process for preparing catalysis nano Al2O3 by using starch gel-
  • Process for preparing catalysis nano Al2O3 by using starch gel-

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 3.75g aluminum nitrate Al(NO 3 ) 3 .9H 2 O. Dissolve 5.0g of soluble starch and 1.09g of urea in 100ml of deionized water, heat to 40°C and stir thoroughly, and filter out impurities to form a uniform mixed solution. Take the above mixed solution and heat it to 80°C to gelatinize the starch molecules to form starch gel, and adjust the pH to 3 with 5mol / L ammonia water. The above-mentioned gel was taken out, and the temperature was rapidly increased to 95° C., so that the urea was hydrolyzed and reacted with the inorganic aluminum salt to form a precipitate, and the time was 2 hours. After the above gel was taken and solidified, it was placed in a muffle furnace and calcined at 600°C for 4 hours in an air atmosphere to obtain Al with an average particle size of 18nm. 2 o 3 The powder has a dispersion coefficient of 0.094 and is code-named Gel-Homo-1.

Embodiment 2

[0037] 12.05g aluminum chloride AlCl 3 .6H 2 O (g), 10.0g soluble starch, and 5.45g urea were dissolved in 100ml deionized water, heated to 60°C and stirred thoroughly, and a uniform mixed solution was formed after filtering impurities. Take the above mixed solution and heat it to 85°C to gelatinize the starch molecules to form starch gel, and adjust the pH to 5 with 5mol / L ammonia water. The above-mentioned gel was taken out, and the temperature was rapidly increased to 98° C., so that the urea was hydrolyzed and reacted with the inorganic aluminum salt to form a precipitate, and the time was 5 hours. After the above gel was taken and solidified, it was placed in a muffle furnace and calcined at 550°C for 4 hours in an air atmosphere to obtain Al with an average particle size of 21nm. 2 o 3 The powder has a dispersion coefficient of 0.103 and is code-named Gel-Homo-2.

Embodiment 3

[0039] 60.25g aluminum chloride AlCl 3 .6H 2 O (g), 8.0 g of soluble starch, and 22.4 g of urea were dissolved in 100 ml of deionized water, heated to 60° C., stirred thoroughly, and then filtered to remove insoluble impurities to form a mixed solution. Take the above mixed solution and heat it to 85°C to gelatinize the starch molecules to form starch gel, and adjust the pH to 7 with 5mol / L ammonia water. The above-mentioned gel was taken out, and the temperature was rapidly increased to 98° C., so that urea was hydrolyzed and reacted with inorganic aluminum salt to form a precipitate, and the time was 8 hours. After the above gel was taken and solidified, it was placed in a muffle furnace and calcined at 600°C for 12 hours in an air atmosphere to obtain Al with an average particle size of 43nm. 2 o 3 The powder has a dispersion coefficient of 0.162 and is code-named Gel-Homo-3.

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Abstract

The invention relates to a process for preparing catalysis nano Al2O3 by using a starch gel-homogeneous precipitation coupling method, which adopts a starch gel-homogeneous precipitation coupling method and comprises the steps of: firstly, pasting polyhydric starch into gel; and secondly, carrying out precipitation reaction in the gel by using urea as a homogeneous precipitation agent and an inorganic aluminum salt. Because of the fixation of the starch gel and the space limit action in the precipitation process, protection and gasification of the starch in the drying and sintering process ensure that the initial Al<3+> ion concentration in the raw materials can reach up 2.5mol / L and the agglomeration is always less. The product has small average particles reaching 18.2 nm of the product and narrow size distribution, standard deviation of 1.7 nm and coefficient of dispersion of 0.0936. The process has low cost of the raw materials, reproduction, environment protection, simple separation and safe operation, high initial Al<3+> concentration and suitability for massively producing the nano Al2O3.

Description

technical field [0001] The invention relates to a method for preparing nanomaterials, in particular to a method for batch-preparing nano-Al with narrow size distribution for catalysis 2 o 3 Methods. Background technique [0002] Nanomaterials have been widely recognized as catalysts or catalyst supports (Serp P, Corrias M, Kalck P. Applied Catalysis A: General, 2003, 253(2): 337-358). Thanks Al 2 o 3 It has excellent properties such as strong mechanical strength and good thermal stability, Al 2 o 3 As a catalyst carrier, it is widely used in the oil and chemical industry, and can be used in reforming, isomerization, hydrogenation, dehydrogenation, desulfurization, denitrification and other processes. al 2 o 3 If it is prepared as a nanopowder, the specific surface area can be greatly increased, and the surface of the particles is rich in mismatch bonds and oxygen-deficient bonds. The performance of the catalyst and catalyst support made by this is better than that of...

Claims

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Application Information

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IPC IPC(8): C01F7/02B01J21/04B01J35/02
Inventor 杨伯伦朱刚利
Owner XI AN JIAOTONG UNIV
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