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Transition metal modified palladium nanocluster loaded cerium oxide catalytic material as well as preparation method and application thereof

A technology of transition metals and catalytic materials, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of poor stability of non-metallic catalysts and inferior service life to noble metal catalysts To achieve the effect of improving the oxidation activity and stability of low-carbon alkane, optimizing the oxidation performance of low-carbon alkane, and enhancing the activation ability

Inactive Publication Date: 2022-03-11
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stability of such non-metallic catalysts is usually poor, and the service life is not as good as that of noble metal catalysts

Method used

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  • Transition metal modified palladium nanocluster loaded cerium oxide catalytic material as well as preparation method and application thereof
  • Transition metal modified palladium nanocluster loaded cerium oxide catalytic material as well as preparation method and application thereof
  • Transition metal modified palladium nanocluster loaded cerium oxide catalytic material as well as preparation method and application thereof

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preparation example Construction

[0028] A kind of preparation method of transition metal modified palladium nano-clusters loaded on cerium oxide catalytic material of the present invention, comprises the following steps:

[0029] Using ammonia water as the precipitating agent and cerium nitrate as the cerium source, the cerium oxide carrier was obtained by the precipitation method; the specific process was: 20mmol Ce(NO 3 ) 3 ·6H 2 O was dissolved in 50mL of deionized water, stirred until clear, added ammonia water drop by drop, adjusted the pH value to 9-9.5, stirred for 2 hours, filtered 3 times with suction, washed, dried in an oven at 80°C for 12 hours, and finally transferred to In a muffle furnace, the temperature was raised from room temperature to 500° C. at a heating rate of 2° C. / min, and calcined in air for 5 hours to obtain a cerium oxide carrier.

[0030] The cerium oxide carriers in the examples of the present invention are all prepared by the above method.

[0031] Dissolve the palladium sou...

Embodiment 1

[0043] First, 0.0632g palladium acetate Pd (OAC) 2 Dissolved in a hydrochloric acid solution with a mass concentration of 37% (the ratio of the amount of substance Pd(OAC) 2 : hydrochloric acid=1:2), after stirring clarification, add 0.0721g Fe (NO 3 ) 3 . 9H 2 O, after stirring and clarification, add 1.96g of CeO prepared above 2 Carrier, after stirring for 30 minutes, add 2mol / L Na 2 CO 3 solution, adjust the pH to 9, stir for 2 hours and then let stand for 2 hours. Then wash and pump 3 times with deionized water, dry the obtained precipitate in an oven at 80°C for 12 hours, then transfer it to a muffle furnace, heat it to 500°C at a heating rate of 2°C / min, and roast it for 4 hours to obtain Pd-Fe / CeO 2 catalyst.

[0044] The loading amount of Pd is 1.5%, and the loading amount of Fe is 0.5%. The catalyst is recorded as 1.5Pd+0.5Fe / CeO 2 .

Embodiment 2

[0046] First 0.05g PdCl 2 Dissolved in the hydrochloric acid solution that mass concentration is 37% (ratio of the amount of substance PdCl 2 : hydrochloric acid=1:2), after stirring clarification, add 0.0740g Co(NO 3 ) 2 . 6H 2 O, after stirring and clarification, add 1.96g of CeO prepared above 2 Carrier, after stirring for 30 minutes, add 2mol / L Na 2 CO 3 solution, adjust the pH to 9, stir for 2 hours and then let stand for 2 hours. Then wash and pump 3 times with deionized water, dry the obtained precipitate in an oven at 80°C for 12 hours, then transfer it to a muffle furnace, heat it to 500°C at a heating rate of 2°C / min, and roast it for 4 hours to obtain Pd-Co / CeO 2 catalyst.

[0047] The supporting amount of Pd is 1.5%, and the supporting amount of Co is 0.5%. The catalyst is recorded as 1.5Pd+0.5Co / CeO 2 .

[0048] Embodiment 2 differs from Embodiment 1 in that the transition metal element is Co.

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Abstract

The invention discloses a transition metal modified palladium nanocluster loaded cerium oxide catalytic material and a preparation method and application thereof.The preparation method comprises the steps that a palladium source and transition metal salt are added into a hydrochloric acid solution and stirred to be uniform, then a cerium oxide carrier is added, the pH value is adjusted to be 9-9.5, stirring is conducted to enable the palladium salt to be loaded on the cerium oxide carrier, standing is conducted to enable solid-liquid separation, the solid is washed, and the transition metal modified palladium nanocluster loaded cerium oxide catalytic material is obtained; and drying and roasting to obtain the transition metal modified palladium nanocluster loaded cerium oxide catalytic material, the mass percent of palladium in the transition metal modified palladium nanocluster loaded cerium oxide catalytic material is 1.0%-2.0%, and the mass percent of transition metal is 0.5%-1.0%. The material has rich oxygen vacancies and high palladium dispersity, and compared with an unmodified pure palladium supported catalyst and a transition metal substituted catalyst, the material has better low-carbon alkane oxidation performance, better water resistance and stability, reproducibility and lower cost.

Description

technical field [0001] The invention relates to a catalytic material used for oxidation and elimination of low-carbon alkanes, in particular to a transition metal-modified palladium nano-cluster supported on cerium oxide catalytic material and its preparation method and application. Background technique [0002] With the rapid development of the economy, the increasing industrialization of human beings has caused huge damage to the ecological environment, and the problem of air pollution has become increasingly serious, which has begun to threaten the sustainable development of human beings. Volatile organic compounds (VOCs) are a major air pollutant. In industrial production, they mainly come from the production of liquid fuels, special chemicals, industrial solvents, and organic polymers. In addition, in the indoor environment, building materials, interior decoration materials, and household and office supplies, such as paints, wood adhesives, household fuels, detergents, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/86B01D53/72F23G7/07
CPCB01J23/894B01D53/8668F23G7/07F23G2209/14Y02E20/34
Inventor 何炽夏良辉建艳飞王晶晶柴守宁王耀
Owner XI AN JIAOTONG UNIV