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Catalyst for selective oxidation of CO and preparation method and application of catalyst

A catalyst and selective technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as difficult to meet industrial needs, narrow temperature window, etc., to achieve The steps are simple and are conducive to the effect of large-scale industrial production

Active Publication Date: 2017-12-12
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature window for the complete conversion of CO of the reported catalysts is often very narrow, which is difficult to meet the growing industrial demand. Therefore, it is still imminent to prepare materials suitable for the selective catalytic oxidation of carbon monoxide in a hydrogen-rich environment with a wide window of 100 ° C to 200 ° C.

Method used

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  • Catalyst for selective oxidation of CO and preparation method and application of catalyst
  • Catalyst for selective oxidation of CO and preparation method and application of catalyst
  • Catalyst for selective oxidation of CO and preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dry and grind the eggshell, take 1g and disperse it in 100mL deionized water, add dropwise 10mL of H2O with a concentration of 3mg / mL 2 PtCl 6 The aqueous solution was added to the above suspension, stirred and adsorbed for 24 hours. Add 100 mg of sodium borohydride powder and continue to stir for 12 hours. The obtained precipitate is washed three times with deionization, filtered, and dried at 80° C. to obtain a Pt / eggshell powder sample, which is designated as Pt / ES.

Embodiment 2

[0027] Dry and grind the eggshell, take 1g and disperse it in 100mL deionized water, add dropwise 5mL of H at a concentration of 3mg / mL 2 PtCl 6 aqueous solution and 5 mL of RuCl at a concentration of 3 mg / mL 3 The aqueous solution was added to the above suspension, stirred and adsorbed for 24 hours. Add 100 mg of sodium borohydride powder and continue to stir for 12 hours. The obtained precipitate is washed three times with deionization, filtered, and dried at 80°C to obtain a Pt-Ru / eggshell powder sample, which is designated as Pt-Ru / ES.

Embodiment 3

[0029] Take 0.1g sample Pt / ES as a catalyst and fill it into a quartz tube, and pass a hydrogen-rich mixed gas through the catalyst. The mixed gas composition is H 2 50%, CO 1%, O 2 1%, the rest is He, the reaction gas flow rate is 40ml / min, and the test temperature is 60℃~240℃. Commercial calcium carbonate supported Pt catalyst Pt / CaCO 3 And the commercial Pt / C catalyst was tested under the same conditions as a comparative example.

[0030] Depend on image 3 It can be seen that the Pt / ES catalyst provided by this application has excellent selective catalytic performance in the range of 120°C to 200°C, and realizes the selective catalytic oxidation of carbon monoxide in a wide window in a hydrogen-rich environment, and is especially suitable for hydrocarbons ( Such as methanol, natural gas, petroleum) through reforming reaction, water gas shift hydrogen production process system and hydrogen supply system of proton exchange membrane fuel cell.

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Abstract

The application discloses a catalyst for selective oxidation of CO and a preparation method and application of the catalyst. The catalyst for selective oxidation of CO uses egg shells as a carrier to carry noble metal nanoparticles; noble metals in the noble metal nanoparticles are selected from at least one of platinum, palladium, ruthenium, rhodium, iridium, gold and silver; or the noble metals are selected from at least one of alloys of at least two of platinum, palladium, ruthenium, rhodium, iridium, gold and silver. The catalyst preferably and selectively oxidizes CO in a hydrogen-rich flow, and CO concentration in the hydrogen-rich flow can be decreased to 10 ppm and below within a wide temperature window; the catalyst is particularly applicable to hydrogen production systems using water-gas shift process and hydrogen supply systems of proton exchange membrane fuel cells.

Description

technical field [0001] The application relates to a catalyst for selectively oxidizing CO, its preparation method and application, and belongs to the field of catalytic chemical industry. Background technique [0002] Currently, more than 50 million tons of hydrogen are produced annually in the world, 95% of which is produced by reforming hydrocarbons and subsequent water-gas shift reactions. The hydrogen obtained by this route always contains about 1% CO impurity. Residual CO impurities seriously restrict the application of hydrogen in many fields, such as poisoning the electrodes of hydrogen proton exchange membrane fuel cells, affecting the selectivity of hydrogenation reactions, etc., so it needs to be removed to below 50ppm. Preferential oxidation of CO in hydrogen-rich gas streams is the most potential way to purify hydrogen, and highly efficient catalysts are awaited. [0003] Catalysts that preferentially oxidize CO in hydrogen-rich gas streams require high activit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/232B01J23/42B01J23/46C01B3/58
CPCC01B3/583B01J23/42B01J23/462B01J27/232C01B2203/044C01B2203/047C01B2203/066C01B2203/1047C01B2203/1041C01B2203/107B01J35/393
Inventor 李广社陈少卿李莉萍黄新松
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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