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Catalyst for methane selective oxidation for making formaldehyde and preparation and application thereof

A catalyst and oxidation technology, applied in the direction of physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, carbon-based compound preparation, etc., can solve the problem of low selectivity of formaldehyde, poor ability to activate methane, and inability to obtain Formaldehyde yield and other issues, to achieve the effect of high formaldehyde selectivity

Active Publication Date: 2010-05-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the catalyst provided by the background patent technology, the methane selective oxidation reaction can be carried out at a lower temperature and a higher pressure to obtain higher formaldehyde selectivity, but the conversion rate of methane is generally low; while the other catalysts have poor ability to activate methane, and the reaction must Operated at higher temperature, although methane conversion is improved, but formaldehyde selectivity is lower
Therefore adopting above-mentioned catalyzer still can't obtain the formaldehyde yield that industrialization is meaningful

Method used

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  • Catalyst for methane selective oxidation for making formaldehyde and preparation and application thereof
  • Catalyst for methane selective oxidation for making formaldehyde and preparation and application thereof
  • Catalyst for methane selective oxidation for making formaldehyde and preparation and application thereof

Examples

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Effect test

Embodiment 1

[0020] Weigh 3.5g Bi(NO 3 ) 3 ·5H 2 O was dissolved with 25g of 20% (weight) nitric acid solution to prepare an acidic solution containing bismuth nitrate. 0.9g NH 4 VO 3 Add 20g deionized water, then use with NH 4 VO 3 Treat with equimolar oxalic acid to prepare a dark blue homogeneous solution containing vanadium precursor, which is mixed evenly with the solution containing bismuth nitrate and heated to 75°C in a water bath. 0.6g (NH 4 ) 6 Mo 7 o 24 4H 2 O dissolved in 20.0 g of 8% (by weight) ammonia solution to form (NH 4 ) 6 Mo 7 o 24 of ammonia solution. Slowly add this solution dropwise to the mixed solution containing bismuth nitrate and vanadium-containing precursor, adjust the pH value to about 5 with nitric acid or ammonia water, stir at constant temperature for 4 hours, evaporate to dryness at 75°C under stirring, and dry at 110°C for 24 Hours, calcination in air at 600°C for 8 hours to prepare catalyst samples. Use 1.0g catalyst to carry out metha...

Embodiment 2

[0022] Weigh 3.5g Bi(NO 3 ) 3 ·5H 2 O was dissolved with 25g of 20% (weight) nitric acid solution to prepare an acidic solution containing bismuth nitrate. 0.9g NH 4 VO 3 Add 20g deionized water, then use with NH 4 VO 3 Treat with equimolar oxalic acid to prepare a dark blue homogeneous solution containing vanadium precursor, which is mixed evenly with the solution containing bismuth nitrate and heated to 75°C in a water bath. 0.6g (NH 4 ) 6 Mo 7 o 24 4H 2 O is dissolved in 20 g of 8% (weight) ammonia solution to form (NH 4 ) 6 Mo 7 o 24 of ammonia solution. Slowly add this solution dropwise into the mixed solution containing bismuth nitrate and vanadium-containing precursor, adjust the pH value to about 7 with nitric acid or ammonia water, stir at constant temperature for 6 hours, evaporate to dryness in a water bath at 75°C while stirring, and dry at 110°C After 24 hours, calcination in air at 600° C. for 8 hours to prepare a catalyst sample. Use 1.0g cataly...

Embodiment 3

[0024] Weigh 8.9gBi(NO 3 ) 3 ·5H 2 O was dissolved with 25g of 20% (weight) nitric acid solution to prepare an acidic solution containing bismuth nitrate. 1.8g NH 4 VO 3 Add 20g deionized water, then use with NH 4 VO 3 Treat with equimolar oxalic acid to prepare a dark blue homogeneous solution containing vanadium precursor, which is mixed evenly with the solution containing bismuth nitrate and heated to 75°C in a water bath. 2.7g (NH 4 ) 6 Mo 7 o 24 4H 2 O dissolved in 20 g of 8% (by weight) ammonia solution to form (NH 4 ) 6 Mo 7 o 24 of ammonia solution. Slowly add this solution dropwise into the mixed solution containing bismuth nitrate and vanadium-containing precursor, adjust the pH value to about 8 with nitric acid or ammonia water, stir at constant temperature for 6 hours, evaporate to dryness in a water bath at 75°C while stirring, and dry at 110°C After 24 hours, calcination in air at 600° C. for 8 hours to prepare a catalyst sample. Use 1.0g catalys...

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Abstract

The present invention provides a formaldehyde catalyst by formaldehyde selecting oxidation and its preparing method and application. The formaldehyde catalyst by formaldehyde selecting oxidation is acrystal state bismuth vanadium molybdenum oxide, the crystal state bismuth vanadium molybdenum oxide is also loaded on a carrier. The mol constitute of the active crystal state bismuth vanadium molybdenum oxide is BiMox / Vy / Odelt, wherein x=0.1-0.9, y=0.1-0.9, delt is a value when O in oxide achieves balance. The X rays diffraction representation result of the catalyst powder shows that active component of the catalyst exists in the presence of crystal state bismuth vanadium molybdenum oxide. The invention catalyst is prepared by coprecipitation method. The invention catalyst can achieves higher methane percent conversion and formaldehyde selectivity in the milder condition contrast to the present technology, especially a higher formaldehyde yield coefficient, the yield coefficient of formaldehyde is above 10% in a suitable condition.

Description

technical field [0001] The invention relates to a catalyst for the selective oxidation of methane to formaldehyde and a preparation method thereof, and further relates to the application of the catalyst in the reaction of selective oxidation of methane to formaldehyde. Background technique [0002] The selective oxidation of methane to formaldehyde is a new way to develop and utilize natural gas resources. The process is different from the Fischer-Tropsch synthesis process. It is an important measure for the adjustment of the fossil energy structure and has attracted much attention for many years. [0003] Methane is the main component of natural gas. For the catalytic process of direct conversion of methane to formaldehyde and methanol, a breakthrough in catalyst technology is the prerequisite for the effective use of natural gas. However, according to the existing research results, there is still no solid catalyst that can give alcohol and aldehyde yields with industrial s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31C07C47/048C07C45/33
Inventor 金英杰方向晨孙万付张舒冬倪向前张锦华
Owner CHINA PETROLEUM & CHEM CORP