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Method using rheological phase reaction method to synthesize flower-ball-like mesoporous alumina

A rheological phase and flower-shaped technology, applied in the field of mesoporous alumina preparation, can solve the problems of high preparation cost, unfavorable large-scale production of mesoporous alumina, cumbersome steps, etc., and achieve the effect of facilitating mass production

Inactive Publication Date: 2016-12-07
QUANGANG PETROCHEM RES INST OF FUJIAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned preparation method has cumbersome steps, long preparation cycle, consumes a large amount of solvents, or uses expensive block copolymers as templates (such as P123, F127), which makes the preparation of mesoporous alumina expensive, and the use of The macromolecular template agent releases a large amount of toxic and harmful gases during the roasting process, which is not conducive to the implementation of large-scale production of mesoporous alumina

Method used

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  • Method using rheological phase reaction method to synthesize flower-ball-like mesoporous alumina
  • Method using rheological phase reaction method to synthesize flower-ball-like mesoporous alumina
  • Method using rheological phase reaction method to synthesize flower-ball-like mesoporous alumina

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Effect test

Embodiment 1

[0023] Take by weighing 1.08g analytical pure aluminum isopropoxide, 0.026g sodium cholate and 0.026g La (NO 3 ) 3 •6H 2 Grind O powder in a mortar, fully grind it uniformly, add 2.0g of ethanol-water mixed solvent (the volume ratio of the two is 1:1) to adjust to a rheological state, then transfer it to a 20mL reactor, seal it, and keep it warm at 100°C After 24 hours, after natural cooling, a white dry gel was obtained. The dry gel was moved to a tube furnace at 550 ° C for 4 hours, the heating rate was 1 ° C / min, and naturally cooled to room temperature to obtain a white powder product. like figure 1 The product shown was identified as γ-Al by X-ray powder diffraction 2 o 3 ;from figure 2 , 3 The morphology analysis of scanning electron microscope and transmission electron microscope shows that the sample is a curd-like layered structure assembled from nanosheets with a thickness of less than 10 nm, and the curd particle size is about 600 nm. Figure 4 N 2 -Adso...

Embodiment 2

[0025] Take by weighing 1.08g analytical pure aluminum isopropoxide, 0.104g sodium cholate and 0.069gLa (NO 3 ) 3 •6H 2 Grind O powder in a mortar, fully grind it uniformly, add 2.0g of ethanol-water mixed solvent (the volume ratio of the two is 1:1) to adjust to a rheological state, then transfer it to a 20mL reactor, seal it, and keep it warm at 100°C After 24 hours, after natural cooling, it was taken out to obtain a white dry gel. The dry gel was moved to a tube furnace at 550 ° C for 4 hours, the heating rate was 1 ° C / min, and naturally cooled to room temperature to obtain a white powder product. The product was identified as γ-Al by X-ray powder diffraction 2 o 3 ; From the morphology analysis of the scanning electron microscope, it can be seen that the sample is a curd cluster, and the curd particle size is about 800 nm; from N 2 - The adsorption-desorption isotherm shows that the mesoporous γ-Al prepared by this implementation method 2 o 3 The specific surfac...

Embodiment 3

[0027] Weigh 2.00g analytically pure Al(NO 3 ) 3 •9H 2 O, 0.104g sodium cholate and 0.026gLa (NO 3 ) 3 •6H 2 Grind O powder in a mortar, fully grind it uniformly, add 2.0g of ethanol-water mixed solvent (the volume ratio of the two is 1:1) to adjust to a rheological state, then transfer it to a 20mL reactor, seal it, and keep it warm at 100°C After 24 hours, after natural cooling, it was taken out to obtain a white dry gel. The dry gel was moved to a tube furnace at 550 ° C for 4 hours, the heating rate was 1 ° C / min, and naturally cooled to room temperature to obtain a white powder product. The product was identified as γ-Al by X-ray powder diffraction 2 o 3 ; From the morphology analysis of the scanning electron microscope, it can be seen that the sample is a curd-shaped cluster, and the curd particle size is about 300 nm; from N 2- The adsorption-desorption isotherm shows that the mesoporous γ-Al prepared by this implementation method 2 o 3 The specific surface ...

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Abstract

The invention discloses a method using a rheological phase reaction method to synthesize flower-ball-like mesoporous alumina. The method is characterized by including: using a small amount of sodium cholate and lanthanum salt to build a soft template, using inorganic aluminum or organic aluminum as the aluminum source, adding a small amount of mixed solvent of organic solvent / water, sufficiently mixing and evenly mixing into a rheological phase substance, keeping the rheological phase substance in a sealed reaction kettle at constant temperature for a certain period of time to obtain dry gel, and roasting at high temperature to obtain the mesoporous alumina. The mesoporous gamma-Al2O3 synthesized by the method is narrow in pore diameter distribution, large in specific surface area, good in thermal stability, and the like. The preparation method is simple in process, free of organic wastewater emission, environmentally friendly, low in cost and short in preparation period, and the problems of environment pollution and overhigh cost due to the fact that a sol-gel method and a solvothermal method use a large amount of solvents and template agents during synthesizing are avoided.

Description

technical field [0001] The invention belongs to a method for preparing mesoporous alumina, in particular to a method for preparing flower-shaped mesoporous alumina by rheological phase reaction. Background technique [0002] Mesoporous alumina has a uniform pore structure, high specific surface area, narrow pore size distribution, and high thermal stability, making it unique in catalytic, adsorption, optical, and conductive properties. It is used in petroleum refining, automobile exhaust control, and ceramic technology. Such chemical processes have important commercial application value. The performance of alumina not only depends on the specific surface area and pore structure, but also is significantly affected by its morphology. Alumina with regular morphology has strong application value. Therefore, the preparation of mesoporous alumina with special morphology is still an alumina material. research hotspot. [0003] The methods for preparing mesoporous alumina mainly i...

Claims

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Application Information

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IPC IPC(8): C01F7/02B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01F7/02C01P2002/72C01P2004/03C01P2004/04C01P2004/45C01P2004/62C01P2006/12C01P2006/16C01P2006/17
Inventor 郑雪琳郑瑛李水艳翁家宝陈登龙
Owner QUANGANG PETROCHEM RES INST OF FUJIAN NORMAL UNIV
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