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Composite CeO2-CoOx oxide carrier and its preparation process

A technology of composite oxides and carriers, which is applied in the direction of catalyst carriers, chemical instruments and methods, cobalt compounds, etc., can solve the problems of uneven distribution of particles and components, and achieve the effect of uniform distribution of components

Active Publication Date: 2009-06-17
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The CeO was prepared by the impregnation method 2 -CoO x Composite oxides, easy to cause uneven distribution of particles and components of the product

Method used

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  • Composite CeO2-CoOx oxide carrier and its preparation process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 4.3424g Ce(NO 3 ) 3 ·6H 2 O and 29.1g Co(NO 3 ) 2 ·6H 2 O, respectively dissolved in 20ml of absolute ethanol, at room temperature, under stirring, add the cerium salt and cobalt salt alcohol solutions into distilled water in parallel, adjust the pH=9 with 1M NaOH solution, continue to stir for 30 minutes, and let it stand for aging for 24 hours, filtered with suction, washed with distilled water, and dried to obtain a hydrogel. Replace the solvent with absolute ethanol, exchange the water in the gel to obtain an alcohol gel, dry the filter cake at 110°C, and bake at 500°C for 3 hours to obtain a molar ratio of cerium to cobalt of 0.1 :1 CeO 2 -CoO x Composite oxide, denoted as (0.1)CeO 2 -CoO x . The specific surface area of ​​the product was determined to be 57.79m 2 / g, the pore volume is 0.46cm 3 / g, the grain size distribution is between 8-40nm. XRD analysis shows an amorphous structure.

Embodiment 2

[0019] The preparation process of composite oxide is the same as embodiment 1, except that 7.09gCeCl 3 ·6H 2 O and 23.78 g CoCl 2 ·6H 2 O was dissolved in 50ml of absolute ethanol, dried at 120°C, roasted at 600°C for 3 hours, adjusted to pH = 10 with 0.1M sodium hydroxide solution, stirred for 40 minutes, and left to age for 12 hours. °C, baked at 600 °C for 3 hours, the molar ratio of cerium and cobalt of the composite oxide is 0.2:1, denoted as (0.2)CeO 2 -CoO x . The specific surface area of ​​the product was determined to be 62.12m 2 / g, the grain size distribution is between 1-30nm, and the XRD analysis shows an amorphous structure.

Embodiment 3

[0021] The preparation process of the composite oxide is the same as in Example 1, except that 6.18gCeCl 3 ·6H 2 O and 10.88g Co(NO 3 ) 2 ·6H 2 O is dissolved in 100ml absolute ethanol, is mixed with the mixed solution of cerium salt and cobalt salt, 1.5M sodium hydroxide solution is added dropwise in the mixed alcohol solution of cobalt salt and cerium salt to pH value 12, continues to stir for 60 minutes, Aged for 3 hours, baked at 400°C for 4 hours, the molar ratio of cerium and cobalt in the composite oxide is 0.46:1, denoted as (0.46)CeO 2 -CoO x . The specific surface area of ​​the product was determined to be 106.99m 2 / g, the pore volume is 0.42cm 3 / g, the grain size distribution is between 10-30nm, and the XRD analysis shows an amorphous structure.

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Abstract

The composite CeO2-CoOx oxide carrier has Ce to Co molar ratio of 0.1-0.6 to 1, crystal grain size of 1-50 nm, specific surface area of 50-180 sq m / g. By means of a sol-gel process with the inorganic salt solution of Ce and Co as the precursor, Co-base composite oxide with low CeO2 content is prepared. The composite CeO2-CoOx oxide carrier of the present invention has the advantages of homogeneous grain and homogeneously distributed components.

Description

technical field [0001] The invention belongs to a catalyst carrier, in particular to a CeO 2 -CoO x Composite oxide carrier and its preparation method. Background technique [0002] The preparation of composite oxides is generally divided into physical methods and chemical methods. Among them, the sol-gel method is one of the more common methods in the chemical liquid phase method. This method has the advantages of accurate stoichiometry, easy addition of active ingredients, fine powder particles, and industrialization. Low cost and other advantages. However, CeO was prepared by the sol-gel method 2 -CoO x Composite oxides have not been reported, and the literature on CeO 2 -CoO x The preparation of composite oxides is mostly concentrated in the precipitation and impregnation methods. Patent CN 1817788A discloses a Co 3 o 4 Co with a mass content of 2-96% 3 o 4 -CeO 2 Composite oxides are used as catalysts for the preferential oxidation of CO in hydrogen-rich gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00C01G51/00
Inventor 王建国王辉朱华青秦张峰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI