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Preparation method of spherical alumina

A spherical alumina and aluminum source technology, applied in chemical instruments and methods, alumina/aluminum hydroxide, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of poor anti-coking ability and stability of catalysts, Small pore volume, low proportion of unsaturated five-coordinate aluminum, etc., to achieve excellent catalytic performance of propane dehydrogenation

Pending Publication Date: 2020-05-15
YINGKOU XIANGYANG CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, most of the reported spherical aluminas have low strength, small pore size and pore volume, or low proportion of unsaturated five-coordinated aluminum, and the catalysts obtained after loading active components have poor carbon deposition resistance and stability. , the dispersion of Pt is not high

Method used

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  • Preparation method of spherical alumina
  • Preparation method of spherical alumina
  • Preparation method of spherical alumina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Add metal aluminum chips with a purity greater than 99% to a mixed solution containing 9% hydrochloric acid and 2.5% citric acid, so that the molar ratio of Al / total acid is 1.5, react the solution at 95°C until the metal aluminum chips are completely dissolved, and filter , to get the solid content (as Al 2 o 3 Mass meter) is 20% aluminum sol. Add an appropriate amount of polyethylene glycol (PEG) and hexamethylenetetramine to the obtained aluminum sol, so that the PEG / Al molar ratio is 0.05, and the hexamethylenetetramine / Al molar ratio is 0.5. Gel pellets were formed in a liquid paraffin oil column at 95°C, aged in the column for 2 hours, transferred to an aging kettle, aged at 140°C for 4 hours, washed with water, dried at 120°C, and roasted at 900°C After 4 hours, the spherical alumina support Al-A was obtained, and its physical properties are shown in Table 1.

Embodiment 2

[0070] Add metal aluminum chips with a purity greater than 99% to a mixed solution containing 10.5% hydrochloric acid and 2.5% oxalic acid, so that the molar ratio of Al / total acid is 1.65, react the solution at 95°C until the metal aluminum chips are completely dissolved, filter, Get the solid content (as Al 2 o 3 Mass meter) is 22% aluminum sol. Add an appropriate amount of polyethylene glycol (PEG) and hexamethylenetetramine to the obtained aluminum sol, so that the PEG / Al molar ratio is 0.025, and the hexamethylenetetramine / Al molar ratio is 0.55. In a liquid paraffin oil column at 95°C, gel beads are formed, aged in the column for 2 hours, transferred to an aging kettle, aged at 140°C for 4 hours, washed with water, dried at 120°C, and roasted at 600°C After 4 hours, a spherical alumina support was obtained, which was denoted as Al-B, and its physical properties are shown in Table 1.

Embodiment 3

[0072] Similar to the method of Example 2, the difference is that the organic acid used is a mixed acid of tartaric acid and succinic acid, and the concentrations are respectively 0.5% and 1.0%. The remaining methods are exactly the same as in Example 2 to obtain spherical alumina carrier Al-C , and its physical properties are listed in Table 1.

[0073] Similar to the method of Example 2, the operation method is exactly the same as that of Example 2, and the preparation parameters are shown in Table 3 to obtain spherical alumina supports Al-1-Al-7.

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Abstract

The invention discloses a preparation method of spherical alumina. The preparation method of spherical alumina comprises the following steps: (1) mixing raw materials containing an aluminum source, anacid I solution and an acid II solution, and heating to obtain aluminum sol, wherein the acid II solution is an organic polybasic acid solution; and (2) adding polyethylene glycol and a gelatinizingagent into the aluminum sol to obtain a solution I, dropwise adding the solution I into an oil column to form gel beads, and aging, washing, drying and roasting the gel beads to obtain the spherical alumina. The spherical alumina prepared by the method has the characteristics of high strength, wear resistance and large pore diameter and pore volume, and a propane dehydrogenation catalyst preparedfrom the spherical alumina is strong in carbon deposition resistance, good in stability and high in propylene selectivity.

Description

technical field [0001] The application relates to a preparation method of spherical alumina, a preparation method of a spherical alumina-supported propane dehydrogenation catalyst and an application of the spherical alumina-supported propane dehydrogenation catalyst, belonging to the field of chemical catalysis. Background technique [0002] Propylene is an important basic organic chemical raw material, which can be used to produce polypropylene, acrylonitrile, propylene oxide, cumene, isopropanol, etc. In recent years, with the rapid development of the downstream market of propylene, the consumption of propylene has continued to increase. However, traditional steam cracking and catalytic cracking by-product propylene can hardly meet the market demand for propylene. With the gradual maturity of propane dehydrogenation technology and the success of industrial application, dozens of propane dehydrogenation industrial units have been successfully put into operation around the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J32/00B01J23/62B01J35/10B01J35/08C07C5/333C07C11/06B82Y30/00B82Y40/00C01F7/02
CPCB01J21/04B01J23/626B01J23/002C07C5/3332B82Y30/00B82Y40/00C01F7/02B01J2523/00C07C2523/62C01P2004/32C01P2004/60C01P2006/14C01P2006/12C01P2006/90C01P2006/21B01J35/613B01J35/635B01J35/615B01J2523/13B01J2523/31B01J2523/43B01J2523/828B01J2523/22C07C11/06Y02P20/52
Inventor 顾彬孙承林荣欣卫皇曌赵颖
Owner YINGKOU XIANGYANG CATALYST
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