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 the problems of narrow temperature window, difficult to meet industrial needs, etc. The steps are simple, the product purity is high, and the effect is conducive to large-scale industrial production

Active Publication Date: 2017-06-06
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
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Effect test

Embodiment 1

[0062] Dissolve 10 mmol of calcium chloride in 100 mL of deionized water, add dropwise 5 mL of 2 mol / L aqueous sodium hydroxide solution, and stir at room temperature for 12 hours. 14 mL of 3 mg / mL H 2 PtCl 6 The aqueous solution was added to the above suspension, stirred and adsorbed for 4 hours. Add 100 mg of sodium borohydride powder, continue to stir for 12 hours, and let stand for 12 hours; wash the obtained precipitate 3 times with deionization, filter, and dry at 80°C to obtain Pt-Ca(OH) 2 The powder sample is denoted as CAT-1.

Embodiment 2

[0064] Dissolve 10 mmol magnesium chloride in 100 mL deionized water, add dropwise 10 mL aqueous sodium hydroxide solution with a concentration of 2 mol / L, and stir at room temperature for 12 hours. Add 5mL of H at a concentration of 3mg / mL dropwise 2 PtCl 6 aqueous solution and 5 mL of RuCl at a concentration of 1 mg / mL 3 The aqueous solution was added to the above suspension, stirred and adsorbed for 4 hours. Add 100 mg of sodium borohydride powder, continue to stir for 12 hours, and let stand for 12 hours; wash the obtained precipitate 3 times with deionization, filter, and dry at 80°C to obtain Pt-Ru / Mg(OH) 2 Powder samples, denoted as CAT-2.

Embodiment 3

[0066] Dissolve 10 mmol of magnesium chloride in 100 mL of deionized water, add dropwise 10 mL of 2 mol / L aqueous sodium hydroxide solution, and stir at room temperature for 12 hours. Add 10mL of H at a concentration of 3mg / mL dropwise 2 PtCl 6 The aqueous solution was added to the above suspension, stirred and adsorbed for 4 hours. Add 100 mg of sodium borohydride powder, continue to stir for 12 hours, and let stand for 12 hours; wash the obtained precipitate 3 times with deionization, filter, and dry at 80°C to obtain Pt / Mg(OH) 2 Powder samples, denoted as CAT-3.

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Abstract

The invention discloses a catalyst for selective oxidation of CO, and a preparation method and application of the catalyst. The catalyst for selective oxidation of CO contains a hybrid material; the hybrid material is prepared from crystals and precious metal quantum dots positioned on crystal edges, wherein the crystals are selected from at least one of metal hydroxide crystals in group IIA, alkaline earth metal oxide crystals in group IIA, metal hydroxide crystals in group IIIA and alkaline earth metal oxide crystals in group IIIA; precious metals in the precious metal quantum dots are selected from at least one of platinum, palladium, ruthenium, rhodium, iridium, gold and silver, or are selected from at least one of alloys formed by at least two of the platinum, the palladium, the ruthenium, the rhodium, the iridium, the gold and the silver. The catalyst can preferentially oxidize the CO in a selective way in hydrogen-rich airflow, and can reduce the concentration of the CO in the hydrogen-rich airflow to 10ppm or below in a wide temperature window, thus being very suitable for a water-gas conversion process hydrogen production system and a hydrogen supply system of a proton exchange membrane fuel cell.

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): B01J23/42B01J23/56C01B3/58
CPCB01J23/002B01J23/42B01J23/56B01J2523/00C01B3/583B01J2523/821B01J2523/828B01J2523/22
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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