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Method for preparing nano-alumina carrier with defect-rich surface

A nano-alumina, carrier technology, applied in catalyst carriers, chemical instruments and methods, catalyst activation/preparation, etc., to achieve the effects of excellent thermal stability and catalytic activity, simple synthesis process and low cost

Active Publication Date: 2018-03-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are insufficient defect sites on the surface of commercial alumina, and there are few technical literatures on the synthesis of defect-rich alumina on the surface. Therefore, it is necessary to invent a preparation method for the surface-rich alumina carrier for the application of supported catalysts.

Method used

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  • Method for preparing nano-alumina carrier with defect-rich surface
  • Method for preparing nano-alumina carrier with defect-rich surface
  • Method for preparing nano-alumina carrier with defect-rich surface

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 0.02mol Al(NO 3 ) 3 9H 2 O and 0.12mol urea are placed in a beaker, the beaker is placed in a constant temperature water bath, and 25mL of deionized water and 5mL of ethylene glycol are slowly added to the beaker with a graduated cylinder, stirred at a constant speed, and the temperature is maintained at 30°C; the above solution is transferred to In a 50mL hydrothermal kettle, hydrothermally react in an oven at 100°C for 24h, cool down to room temperature naturally, wash to neutrality by centrifugation, and dry the product in an oven at 80°C overnight. The obtained white precipitate was calcined in a muffle furnace at 800° C. for 2 h at a heating rate of 1° C. / min to obtain a nanorod-shaped alumina carrier, and its scanning electron microscope is shown in FIG. 1 . Nitrogen adsorption test results show that the specific surface area is about 230m 2 / g, the pore volume is 0.40cm 3 / g, its nitrogen adsorption isotherm curve is as follows figure 2 shown.

Embodiment 2

[0031] 13.27mg H 2 PtCl 6 ·6H 2 O and 14.94 mg SnCl 2 2H 2 The O precursor was dissolved in 330 μL ethanol solution, and an equal volume of the above solution was impregnated onto 1 g of the carrier prepared in Example 1. After impregnation, the sample was allowed to stand at room temperature for 2 hours, and dried in an oven at 50° C. overnight. The obtained sample was heated in 20% O 2 / N 2 Roasting at 500°C for 4 hours in atmosphere to obtain PtSn / Al for propane dehydrogenation to propylene 2 O 3 catalyst.

Embodiment 3

[0033] Take 120 mg of the alumina carrier prepared in Example 1 and evenly disperse it in 6 mL of deionized water, add 735 μL of HAuCl 4 (4.9g / L) solution, after stirring for 10 minutes, add 200 μL precipitant (0.5M ammonium carbonate solution), and after the system is stable, place the mixed solution in a 60°C water bath for 2 hours. Centrifugal washing (4 times with deionized water, 1 time with ethanol) to remove chloride ions. Finally, vacuum dry overnight (the desiccant is P 2 O 5 ), that is, Au / Al oxidized by carbon monoxide 2 O 3 catalyst.

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Abstract

The invention provides a method for preparing a nano-alumina carrier with a defect-rich surface. The method comprises the following steps: dissolving an inorganic aluminum salt and a precipitating agent in a water-ethylene glycol mixed solvent according to a certain molar ratio, performing stirring to obtain a transparent solution, and transferring the solution to a hydrothermal kettle; and filtering, washing, drying and calcining a reaction material after a reaction is completed in order to obtain the nano-alumina carrier with the defect-rich surface. The nano-alumina material with the defect-rich surface is prepared through a simple solvothermal-pyrolysis technology. A supported nano-precious metal catalyst prepared by using the material as a catalyst carrier has excellent thermal stability and excellent catalytic activity. The preparation method has the advantages of simple synthesis process and low cost, and is suitable for the technical field of the production of supported catalysts.

Description

technical field [0001] The invention relates to a nano-alumina carrier whose surface is rich in defect sites, a preparation method thereof, and an application of the material in a supported catalyst. Background technique [0002] Alumina is one of the most commonly used industrial raw materials, and has extremely important applications in ceramics, refractory materials, medicine, catalysis and other fields. Alumina has a large specific surface area, adjustable pore volume and pore size distribution, good mechanical strength, good thermal stability, and low price. At the same time, it has a variety of different crystal phase structures, and there are acid centers with different properties on the surface. Therefore, alumina is the most widely used catalyst support in the petroleum industry. [0003] Chinese patent [CN 106276992 A] discloses a method for preparing a leaf-shaped γ-alumina carrier. The method uses inorganic aluminum source and urea as raw materials. After hydrot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J23/52B01J23/62B01J32/00
CPCB01J21/04B01J23/52B01J23/626B01J37/033B01J37/10B01J35/394B01J35/393B01J35/635B01J35/633B01J35/615
Inventor 陆安慧谭景奇
Owner DALIAN UNIV OF TECH
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