Preparation method for integral catalyst for selectively oxidizing CO in hydrogen-rich reformed gas

A monolithic catalyst and selective technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst carrier, etc., can solve the problem of high catalyst ignition temperature, high CO outlet concentration, noble metal loading High catalytic activity and stability, high activity and high catalyst utilization can be achieved

Inactive Publication Date: 2009-11-04
HANERGY TECH
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. The content of precious metals is too high, causing the cost to rise
[0008]2. Catalyst ignition temperature is too high, catalyst selectivity is low
[0009]3. The active temperature zone is too narrow
[0010]4. Due to the preparation and pretreatment method of the catalyst, the performance of the catalyst is not high
[0011] U.S. Patent US20020147107 invented a catalyst that can be applied to selectively oxidize CO in hydrogen-rich reformed gas. The catalyst is to load Ru on alumina pellets by impregnation method, which can reduce the CO concentration in reformed gas. to less than 50ppm, but the loading of Ru in the catalyst is higher, reaching 0.5-3%
[0012] Chinese patent CN1216796C invented a catalyst that can be applied to selectively oxidize CO in hydrogen-rich reformed gas. The active component of the catalyst is Pt, Ru or The alloy of the two, Pt or Ru is loaded on the support by the method of incipient wetness impregnation, and the obtained reformed gas with reduced CO concentration can be used as fuel for fuel cells, but the loading of noble metals in the catalyst is also high, around 3%
However, the activity of the catalyst is low, and the highest effective working temperature range can only reach 85%, the concentration of CO outlet is too high, and the purified reformed gas still cannot meet the standard as fuel gas for fuel cells

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
  • Preparation method for integral catalyst for selectively oxidizing CO in hydrogen-rich reformed gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Ru / K 2 The preparation method of O monolithic catalyst is as follows:

[0036] (1) Weigh RuCl according to the Ru:K molar ratio of 10:1 3 and KNO 3 , wherein, the content of Ru is 2wt% of the catalyst, dissolved with 3M nitric acid solution, and formulated into a 10mg / ml solution, pipetting 25ml of the solution in a 50ml beaker, and heating to 80°C in a water bath;

[0037] (2) Immerse 5ml of cordierite coated with 4wt% aluminum glue in the above solution by equal volume impregnation method, shake the beaker gently during the impregnation process, so that the solution is evenly impregnated on the cordierite, and the impregnation time is 5min ;

[0038] (3) Take out the impregnated cordierite, dry it slowly, and put it in a microwave oven for 5 minutes;

[0039] (4) the above cordierite in N 2Under protection, pre-calcine at 120°C for 1 hour, then rapidly raise the temperature to 800°C, and bake for 4 hours;

[0040] (5) product in step (4) in H 2 The volume perce...

Embodiment 2

[0043] Ru / Na 2 The preparation method of O monolithic catalyst is as follows:

[0044] (1) Weigh RuCl according to the Ru:Na molar ratio of 5:1 3 and NaNO 3 , wherein, the content of Ru is 1wt% of the catalyst, dissolved with 1M nitric acid solution, and prepared into a 10mg / ml solution, pipetting 25ml of the solution in a 50ml beaker, and heating to 80°C in a water bath;

[0045] (2) Impregnate 5ml of cordierite coated with 3wt% aluminum glue in the above-mentioned solution by an equal-volume impregnation method, shake the beaker gently during the impregnation process, so that the solution is evenly impregnated on the cordierite, and the impregnation time is 7.5 min;

[0046] (3) Take out the impregnated cordierite, blow dry slowly, put into microwave oven and dry 1min;

[0047] (4) the above cordierite in N 2 Under protection, pre-calcine at 160°C for 3 hours, then rapidly raise the temperature to 1000°C, and bake for 2 hours;

[0048] (5) product in step (4) in H 2 T...

Embodiment 3

[0051] The preparation method of Ru / MgO monolithic catalyst is as follows:

[0052] (1) Weigh RuCl according to the Ru:Mg molar ratio of 20:1 3 and Mg(NO 3 ) 2 , wherein, the content of Ru is 2wt% of the catalyst, dissolved with 2M nitric acid solution, prepared into a 10mg / ml solution, pipetting 25ml of the solution in a 50ml beaker, and heating to 60°C in a water bath;

[0053] (2) Immerse 5ml of cordierite coated with aluminum glue with a catalyst content of 5wt% in the above solution by an equal volume impregnation method, gently shake the beaker during the impregnation process, so that the solution is evenly impregnated on the cordierite, and the impregnation time is 10min ;

[0054] (3) Take out the impregnated cordierite, dry it slowly, and put it in a microwave oven for 2.5 minutes;

[0055] (4) the above cordierite in N 2 Under protection, pre-calcine at 100°C for 3 hours, then rapidly raise the temperature to 300°C, and bake for 5 hours;

[0056] (5) product in...

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 preparation method for an integral catalyst for selectively oxidizing CO in hydrogen-rich reformed gas, and belongs to the field of CO preferential oxidization catalyst preparation. The preparation method for the catalyst comprises the following steps: dissolving salt of Ru and salt of soluble alkali metal or/and alkaline-earth metal in a nitric acid solution, and preheating the mixed solution in a water bath; steeping a dichroite carrier coated with alumina gel in the preheated solution for 5 to 10min, drying the dichroite carrier, preroasting the dichroite carrier at a temperature of between 100 and 160 DEG C for 1 to 3h and then roasting the dichroite carrier at a temperature of between 300 and 1,000 DEG C for 2 to 5h at the atmosphere of inert gases; and reducing the obtained product at a temperature of between 300 and 800 DEG C for 2 to 5h at the atmosphere of H2-inert gas mixture. The method has simple preparation process and low cost; and the obtained catalyst has the characteristics of high activity, high CO selection, low content of noble metal, low ignition temperature, wide temperature range, and capacity of being conveniently applied to a fuel cell system.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for selectively oxidizing CO in hydrogen-rich reformed gas, in particular to a method for preparing a monolithic catalyst for selectively oxidizing CO in hydrogen-rich reformed gas. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) is a power generation device that directly converts chemical energy into electrical energy by electrochemical reaction. Compared with traditional power generation devices, it has high energy conversion efficiency, no pollution, low noise, adaptability With the advantages of different power requirements, it has broad application prospects as a fixed power supply (such as a power station) and a mobile power supply for electric vehicles, submarines, aerospace, etc. One form of energy. As the fuel of the PEMFC system, hydrogen mainly comes from the reforming reaction of methanol or natural gas, so 2-15% CO will inevitably remain in the hydrogen. ...

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 Applications(China)
IPC IPC(8): B01J23/58B01J32/00H01M8/04H01M8/04701
CPCY02E60/50
Inventor 肖钢孙伟华周帅林
Owner HANERGY TECH
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