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Antimony oxide catalyst for preparing quadri-aldehyde by selective oxidation of methane

A technology of antimony oxide and oxidation system, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst activation/preparation, etc.

Inactive Publication Date: 2005-06-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

But the catalysts of these two patents all work under pressure higher than normal pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 10 g of tartaric acid into 40 ml of water, heat until completely dissolved, add 0.4 g of antimony trioxide and heat until completely dissolved. Then 8.0 g of silicon dioxide was added for impregnation, dried at room temperature for 24 hours, and then placed in an oven at 100° C. for 12 hours. The sample was then placed in a muffle furnace and burned at 600°C for 4 hours, then cooled to room temperature to obtain a catalyst. Selective oxidation of methane with 0.2 g of catalyst, CH 4 / He / O 2 =17:3:5, the total flow rate of the reaction gas is 25ml / mim. The reaction was carried out at 600°C, the methane conversion rate was 1.6%, and the formaldehyde selectivity was 22.5%.

Embodiment 2

[0022] Add 0.5 g of antimony trioxide to 10 ml of water, and stir vigorously. Then 5.0 g of silicon dioxide was added for impregnation, dried at room temperature for 24 hours, and then placed in an oven at 100° C. for 12 hours. The sample was then placed in a muffle furnace and burned at 600°C for 4 hours, then cooled to room temperature to obtain a catalyst. Selective oxidation of methane with 0.2 g of catalyst, CH 4 / He / O 2 =17:3:5, the total flow rate of the reaction gas is 25ml / mim. The reaction was carried out at 600°C, the conversion rate of methane was 1.3%, and the selectivity of formaldehyde was 23%.

Embodiment 3

[0024] Add 2.5 g of antimony trichloride to 25 ml of absolute ethanol to form an absolute ethanol solution of antimony trichloride. Then 8.04 g of silicon dioxide was added for impregnation, and after drying at room temperature for 12 hours, 100 ml of 2M ammonia water was added, stirred for 2 hours, and then filtered. Then the sample was washed with water until the pH value was 6-7, and left at room temperature for 24 hours. The sample was dried in an oven at 100°C for 12 hours, then placed in a muffle furnace and burned at 600°C for 4 hours, then lowered to room temperature to obtain a catalyst. Selective oxidation of methane with 0.2 g of catalyst, CH 4 / He / O 2 =17:3:5, the total flow rate of the reaction gas is 25ml / mim. The reaction was carried out at 600°C, the conversion rate of methane was 1.2%, and the selectivity of formaldehyde was 25.8%.

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Abstract

The antimony oxide catalyst for oxidizing methane selectively to prepare formaldehyde has antimony trioxide, antimony tetraoxide and antimony pentoxide as catalyst, which may be loaded on silica. The catalyst, when used in the selective methane oxidizing reaction with molecular oxygen as oxidant, can reach formaldehyde selectivity of 24.8 % at 600 deg.c or 17.6 % at 650 deg.c. The silica carried catalyst can reach formaldehyde selectivity of 41 % at 600 deg.c or 18 % at 650 deg.c, and higher formaldehyde yield at 650 deg.c than at 600 deg.c.

Description

technical field [0001] The invention relates to a catalyst for the selective oxidation of methane to formaldehyde. [0002] The present invention also relates to a method for preparing the above-mentioned catalyst. [0003] The invention also relates to the application of the above-mentioned catalyst in the selective oxidation of methane to formaldehyde. Background technique [0004] with O 2 The research on the direct production of methanol and formaldehyde by the selective oxidation of methane as an oxidant has been paid attention to for many years due to its great economic and academic value, but the aldol yield with industrial significance has not been obtained so far, and the activation and transformation mechanism of methane have not yet been explored. It has been shown that this research remains one of the biggest challenges in catalysis research. The difficulty in the selective oxidation of methane to methanol and formaldehyde directly lies in the CH 4 Being the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J37/02C07C47/048
Inventor 李灿张海东张静应品良
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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