Method for inorganically synthesizing organized mesoporous alumina

A technology for mesoporous alumina and inorganic synthesis, applied in chemical instruments and methods, preparation of alkali metal aluminate/alumina/aluminum hydroxide, and other chemical processes, etc., can solve the problem of high raw material cost, acid-base pollution, operation Complicated and other problems, to achieve the effect of low cost, reduced raw material cost and simple process

Inactive Publication Date: 2011-03-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Mesoporous Al at home and abroad 2 o 3 The preparation technology is still in the research stage, and most of them use organic systems to synthesize ordered mesoporous Al 2 o 3 , the cost of raw materials is high, the entire preparation process must be carried out in an anhydrous environment, and the operation is complicated
The reported inorganic system synthesized ordered mesoporous Al 2 o 3 The acid method (introducing bases such as NaOH, KOH, NH 3 ·H 2 O or Na 2 CO 3 etc. as precipitant) or alkali method (introducing acid such as HNO 3 , HCI, H 2 SO 4 or NH 4 HCO 3 etc. as a precipitating agent), there is an acid-base pollution problem

Method used

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  • Method for inorganically synthesizing organized mesoporous alumina
  • Method for inorganically synthesizing organized mesoporous alumina
  • Method for inorganically synthesizing organized mesoporous alumina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A. Synthesis reaction: Add 200ml of 1mol / L NaAlO at 60°C and 500rpm with continuous stirring 2 In the solution, slowly add 100ml of 1mol / L AlCl at a rate of 0.6ml / min 3 Solution, that is, control the molecular ratio of the two aluminum salts to be 2:1, add 12.0g template methylcellulose powder (concentration is 40g / L) when PH=11, continue to insulate and stir the reaction for 3 hours after the addition is complete;

[0029] B. Aging: Aging the precursor obtained in step A at 60°C for 15 hours;

[0030] C. Filtration, washing: after the mixture obtained in step B is vacuum filtered, wash with deionized water;

[0031] D. drying: drying the filter cake obtained in step C at 60°C for 12 hours;

[0032] E. Calcination: Put the precursor powder obtained in step D in a muffle furnace, heat up to 650°C at a rate of 100°C / hour and keep it for 3 hours to prepare mesoporous Al 2 o 3 .

[0033] After diluting the filtrate obtained by vacuum filtration in step C, the concentra...

Embodiment 2

[0036] A. Synthesis reaction: 150ml of 3mol / L NaAlO 2In the solution, slowly add 150ml of 3mol / L AlCl at a rate of 1ml / min 3 Solution, that is, control the molecular ratio of the two aluminum salts to be 1:1, add 12.0g template methylcellulose powder (concentration is 40g / L) when PH=11, continue to insulate and stir the reaction for 10 hours after the addition is completed;

[0037] B. Aging: aging the precursor obtained in step A at 50°C for 15 hours;

[0038] After diluting the filtrate obtained by vacuum filtration in step C, the concentration of methylcellulose in the filtrate was determined by diphenylamine colorimetry to be 12.79 g / L (accounting for 32.0% of the total amount).

[0039] C. Filtration, washing: the mixture obtained in step B is vacuum filtered and washed;

[0040] D. drying: drying the filter cake obtained in step C for 96 hours at 20°C;

[0041] E. Calcination: Put the precursor powder obtained in step D in a muffle furnace, raise the temperature to 10...

Embodiment 3

[0044] The operating process is the same as in Example 1 except that the following steps are different.

[0045] A. Synthesis reaction: Add 150ml of 2mol / L NaAlO under constant stirring at 80°C and 400rpm 2 In the solution, slowly add 50ml of 2mol / L AlCl at a rate of 2ml / min 3 Solution, that is, control the molecular ratio of the two aluminum salts to be 3:1, add 20.0g template methylcellulose powder (concentration is 100g / L) when PH=11, continue to insulate and stir the reaction for 2 hours after the addition is completed;

[0046] B. aging: aging the precursor obtained in step A at 50°C for 8 hours;

[0047] After diluting the filtrate obtained by vacuum filtration in step C, the concentration of methylcellulose in the filtrate was determined by diphenylamine colorimetry to be 35.7 g / L (accounting for 35.7% of the total amount).

[0048] The specific surface area of ​​the prepared ordered mesoporous alumina product is 290.6m 2 / g, the pore volume is 0.27cm 3 / g, the pore...

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Abstract

The invention belongs to the field of inorganic nano structure materials, in particular to a method for inorganically synthesizing organized mesoporous alumina, which is characterized in that inorganic matters of sodium aluminate and aluminum chloride are in acid-base pairing to prepare mesoporous alumina which has large specific surface area, narrow pore-size distribution, organized pore channel and high hydrothermal stability; and methyl cellulose which is used as a template agent in a synthesizing process has thermosensitivity and is beneficial to recycle. The method for inorganically synthesizing organized mesoporous alumina has the characteristics that raw materials have low cost, the template agent can be recycled, the technology is simple and easy to control, and the like. The method for inorganically synthesizing organized mesoporous alumina is easy to realize industrial production, and the obtained organized mesoporous alumina has wide application prospect in the fields of catalytic reaction, adsorption, separation, and the like.

Description

technical field [0001] The invention belongs to the field of inorganic nanostructure materials, in particular to a method for inorganically synthesizing ordered mesoporous alumina. Background technique [0002] Mesoporous materials are a new type of nanostructured materials that emerged rapidly in the early 1990s. Because of their excellent properties, they have been widely valued by the chemical, physical and material circles around the world as soon as they appeared. [0003] Porous materials have been widely used in catalysis, adsorption, separation and other fields. However, in the field of catalysis, traditional microporous catalysts have limited their application in the participation or formation of organic macromolecules due to their small pore size (<2.0nm), and the emergence of mesoporous molecular sieves may effectively meet this requirement. Demand, mesoporous molecular sieves have large specific surface area, large pore size and narrow distribution, adjustabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14B01J20/08B01J20/30B01J21/04B01J35/04B01J37/02
Inventor 张亦飞钟莉张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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