Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of methane selective oxidation catalyst and its preparation method and application

A catalyst and selectivity technology, applied in the direction of oxidation reaction preparation, hydrocarbon oxidation preparation of oxygenated compounds, physical/chemical process catalysts, etc., can solve the problems of high reaction pressure, high reaction temperature, low selectivity of formaldehyde and methanol, etc., to achieve Enhanced oxygen storage capacity, accelerated transfer rate, and improved selectivity

Active Publication Date: 2018-06-19
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN1621150A discloses a silica-loaded antimony oxide catalyst and its preparation method for the selective oxidation of methane to formaldehyde. Its examples show that the highest formaldehyde selectivity of the reaction at 600 ° C is 30.2%, and the methane conversion rate at this time is Only 0.7%, but the reaction temperature is too high, which requires high catalyst activity and stability
However, the reaction pressure in this patent is too high, and the safety requirements for the equipment are relatively high.
[0005] In short, the above-mentioned catalysts generally have one or more deficiencies such as the need to further increase the methane conversion rate, the low selectivity of formaldehyde and methanol, and the relatively high reaction pressure.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 8.1gLa 2 o 3 Completely dissolve in nitric acid, adjust the pH of the solution to 3-4 with ammonia water; add 3.8g of cerium nitrate, 17.7g of iron nitrate, and 2.6g of ammonium molybdate into the above solution in sequence according to the stoichiometric ratio, and stir at 85°C for 8 hours, evaporated to a gel. Put the gel into an oven, dry it at 120°C for 12 hours, then bake it at 550°C for 8 hours, and finally raise the temperature to 900°C for 6 hours; press the calcined sample into tablets, crush it to 20-40 mesh, and prepare The catalyst molecular formula is La 1.7 Ce 0.3 Fe 1.5 Mo 0.5 o 6-δ .

[0018] Catalyst evaluation was carried out in a continuous flow miniature fixed-bed reactor, where the reaction temperature was 580°C; the reaction pressure was 1.5MPa; the molar composition of the feed gas was CH 4 : O 2 : H 2 O=2 : 1 : 1, airspeed is 2100h -1 , the conversion rate of methane was 8.1%, and the selectivity of methanol and formaldehyde wa...

Embodiment 2

[0020] Weigh 8.1gLa 2 o 3 Completely dissolve in nitric acid, adjust the pH of the solution to 3-4 with ammonia water; add 5.4g of cerium nitrate, 17.5g of ferric nitrate, and 3.3g of ammonium molybdate into the above solution in sequence according to the stoichiometric ratio, and stir at 85°C for 8 hours, evaporated to a gel. Put the gel into an oven, dry it at 120°C for 12 hours, then bake it at 550°C for 8 hours, and finally raise the temperature to 900°C for 6 hours; press the calcined sample into tablets, crush it to 20-40 mesh, and prepare The catalyst molecular formula is La 1.6 Ce 0.4 Fe 1.4 Mo 0.6 o 6-δ .

[0021] Catalyst evaluation is the same as in Example 1, the difference is that the reaction temperature is 550°C, the reaction pressure is 2MPa; the space velocity is 2200h -1 , the conversion rate of methane was 8.9%, and the selectivity of methanol and formaldehyde was 74.8%.

Embodiment 3

[0023] Weigh 8.1gLa 2 o 3 Completely dissolve in nitric acid, adjust the pH of the solution to 3-4 with ammonia water; add 7.2g of cerium nitrate, 17.3g of ferric nitrate, and 4.1g of ammonium molybdate into the above solution in sequence according to the stoichiometric ratio, and stir at 85°C for 8 hours, evaporated to a gel. Put the gel into an oven, dry it at 120°C for 12 hours, then bake it at 550°C for 8 hours, and finally raise the temperature to 900°C for 6 hours; press the calcined sample into tablets, crush it to 20-40 mesh, and prepare The catalyst molecular formula is La 1.5 Ce 0.5 Fe 1.3 Mo 0.7 o 6-δ .

[0024] The catalyst evaluation was the same as in Example 1, except that the reaction temperature was 600°C and the reaction pressure was 2.5 MPa; the methane conversion rate was 10.7%, and the methanol and formaldehyde selectivity was 79.1%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a catalyst for the selective oxidation of methane to synthesize methanol and formaldehyde. The catalyst is a composite metal oxide with a double perovskite structure, and its structural formula is La2-xCexFe2-yMoyO6-δ, wherein 0

Description

technical field [0001] The invention relates to a methane selective oxidation catalyst and its preparation method and application, in particular to a double perovskite type methane selective oxidation catalyst and its preparation method and application. Background technique [0002] With the increasing shortage of fossil resources such as oil and coal, the use of natural gas as a high-quality, clean energy and chemical raw material has attracted more and more attention from all countries. The main component of natural gas is methane. The development of methane direct production of methanol and formaldehyde technology, compared with the current industrialized indirect method, has the advantages of simple route and low cost. Therefore, Shell, Sasol, Exxon-Mobil, BP and other major oil companies Has invested heavily in research. The selective oxidation of methane to methanol and formaldehyde is one of the most challenging topics in catalytic research. There are two difficultie...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887C07C27/14C07C31/04C07C29/50C07C47/048C07C45/33
CPCY02P20/52
Inventor 张信伟张舒东孙晓丹尹泽群刘全杰张喜文
Owner CHINA PETROLEUM & CHEM CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com