Ru-based core-shell catalyst and its preparation method and use in methane oxidation reforming preparation of synthetic gas

A catalytic oxidation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, silicon compounds, etc., can solve the problems of high initial activity, limited resources, easy deactivation, etc. Highly active effect

Inactive Publication Date: 2015-04-08
南京大学扬州化学化工研究院 +1
View PDF2 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, nickel-based catalysts are easily oxidized to nickel oxide and deactivated. At the same time, sintering and carbon deposition are still the main problems restricting the practical application of nickel catalysts.
[0007] Based on the analysis of the above process and related catalysts, it can be seen that although the Pt and Rh components in noble metal catalysts have high activity and slight deactivation, these two metals are very expensive and have limited resources.
Although the initial activity of the Ni component in the non-noble metal catalyst is good, the catalyst deactivates quickly
Therefore guiding idea of ​​the present invention is based on following three points: (1) select Ru component in noble metal, so far the research that this metal component is applied to this target reaction is very little, a

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ru-based core-shell catalyst and its preparation method and use in methane oxidation reforming preparation of synthetic gas
  • Ru-based core-shell catalyst and its preparation method and use in methane oxidation reforming preparation of synthetic gas
  • Ru-based core-shell catalyst and its preparation method and use in methane oxidation reforming preparation of synthetic gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 0.4g of cetyltrimethylammonium bromide (CTAB) to 50ml of distilled water, stir at 50°C for 1h, then add 0.1g of RuCl 3 , stirred for 1 h, added dropwise hydrazine hydrate (diluted 1 ml hydrazine hydrate to 9 ml distilled water, and adjusted pH=10 with 1 mol / L NaOH) into the three-necked flask, and reacted for 1 h. The product was separated by centrifugation with H 2 O and EtOH were washed three times each, dried at 80 °C, and calcined at 500 °C in air for 3 h. Take 0.2g of ruthenium oxide nanoparticles prepared above, add them to 60ml of absolute ethanol, and after ultrasonic treatment (KQ-100DE, 40kHz, 100W) for 0.5h, add 6ml of NH 3 ·H 2 O Continue to sonicate for 0.5h, then add 0.0624g of tetraethyl orthosilicate (TEOS) to make Si / Ru=0.2, continue to sonicate for 1h, wash by centrifugation, and dry at 100°C. The dried catalyst was pressed into tablets and crushed to obtain 40-60 mesh particles for activity testing.

[0037] Take 50 mg of the above-mentioned c...

Embodiment 2

[0039] Add 0.4g CTAB to 50ml distilled water, stir at 50°C for 1h, then add 0.1g RuCl 3 , stirred for 1 h, added dropwise hydrazine hydrate (diluted 1 ml hydrazine hydrate to 9 ml distilled water, and adjusted pH=10 with 1 mol / L NaOH) into the three-necked flask, and reacted for 1 h. The product was separated by centrifugation with H 2 O and EtOH were washed three times each, dried at 80 °C, and calcined at 500 °C in air for 3 h. Take 0.2g of ruthenium oxide nanoparticles prepared above, add them to 60ml of absolute ethanol, and after ultrasonic treatment (KQ-100DE, 40kHz, 100W) for 0.5h, add 6ml of NH 3 ·H 2 O Continue to sonicate for 0.5h, then add 0.0315g TEOS to make Si / Ru=0.1, continue to sonicate for 1h, wash by centrifugation, and dry at 100°C. The dried catalyst was pressed into tablets and crushed to obtain 40-60 mesh particles for activity testing.

[0040] Take 50 mg of the above-mentioned catalyst, and carry out the continuous reaction of methane partial oxidat...

Embodiment 3

[0042] Add 0.4g CTAB to 50ml distilled water, stir at 50°C for 1h, then add 0.1g RuCl 3 , stirred for 1 h, added dropwise hydrazine hydrate (diluted 1 ml hydrazine hydrate to 9 ml distilled water, and adjusted pH=10 with 1 mol / L NaOH) into the three-necked flask, and reacted for 1 h. The product was separated by centrifugation with H 2 O and EtOH were washed three times each, dried at 80 °C, and calcined at 500 °C in air for 3 h. Take 0.2g of ruthenium oxide nanoparticles prepared above, add them to 60ml of absolute ethanol, and after ultrasonic treatment (KQ-100DE, 40kHz, 100W) for 0.5h, add 6ml of NH 3 ·H 2 O Continue to sonicate for 0.5h, then add 0.0933g TEOS to make Si / Ru=0.3, continue to sonicate for 1h, wash by centrifugation, and dry at 100°C. The dried catalyst was pressed into tablets and crushed to obtain 40-60 mesh particles for activity testing.

[0043] Take 50 mg of the above-mentioned catalyst, and carry out the continuous reaction of methane partial oxidat...

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 methane partial-oxidation preparation of synthetic gas. Ruthenium oxide or nickel-ruthenium oxide nanoparticles are synthesized and then are coated with SiO2 so that a core-shell structure is formed, and the core-shell structure undergoes in-situ reduction so that ruthenium oxide or nickel-ruthenium oxide core particles are reduced into metal ruthenium or nickel-ruthenium dimetal and a core-shell metal catalyst with a microcapsule structure is obtained. The microcapsule structure is conducive to reactant molecule enrichment, adsorption on the catalyst surface and activation. The catalyst is used for methane partial-oxidation preparation of synthetic gas, has high catalyst activity, a methane conversion rate greater than 95%, CO/H2 selectivity greater than 90% or a methane conversion rate greater than 90%, and CO/H2 selectivity greater than 95%. After consecutive reaction for 10 days, a conversion rate and selectivity are not reduced and thus the catalyst for the object reaction has high efficiency and good stability. The invention discloses a preparation method of the Ru-based core-shell catalyst.

Description

technical field [0001] The invention relates to a Ru-based core-shell structure catalyst and its application in methane oxidation reforming to produce synthesis gas. Background technique [0002] The production and application of syngas plays an extremely important role in the chemical industry. As an important chemical raw material, it can be used to produce chemicals such as methanol, formic acid, liquid fuel, and dimethyl ether. Methanol produced from synthesis gas is a very important large-tonnage organic chemical product. Since the rise of oil prices in the 1970s, the concept of carbon-chemistry has been proposed. It can be said that syngas is an important raw material to replace traditional petrochemicals, but the investment and production costs in the process of syngas preparation account for about 50% or even more of the natural gas conversion and the entire utilization process, so the research and development of natural gas to syngas The new process of synthetic ...

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
IPC IPC(8): B01J23/89B01J23/46B01J20/10C01B3/40
CPCY02P20/52
Inventor 季伟捷宋艳艳李雷孙博庞义军顾书圣
Owner 南京大学扬州化学化工研究院
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap