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Supported noble metal catalysts with performance of resisting high-temperature sintering and preparing method thereof

A noble metal catalyst, sintering performance technology, applied in the field of catalysis, can solve the problem of deactivation of supported noble metal catalysts

Active Publication Date: 2018-08-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of deactivation of existing supported noble metal catalysts caused by thermal sintering, and provide a supported noble metal catalyst with high temperature sintering resistance and its preparation method

Method used

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  • Supported noble metal catalysts with performance of resisting high-temperature sintering and preparing method thereof
  • Supported noble metal catalysts with performance of resisting high-temperature sintering and preparing method thereof
  • Supported noble metal catalysts with performance of resisting high-temperature sintering and preparing method thereof

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preparation example Construction

[0032] The present invention also provides a preparation method of a supported noble metal catalyst with high temperature sintering resistance, the method comprising:

[0033] Step 1: Add MO to the soluble precursor of the primary carrier x Soluble precursors to obtain composite nanoparticles;

[0034] Step 2: stirring and mixing the composite nanoparticles obtained in step 1 with the secondary carrier to obtain the primary carrier / stabilizer / secondary carrier;

[0035] Step 3: Use the primary carrier / stabilizer / secondary carrier obtained in step 2 with SiO 2 Coating, get primary carrier / stabilizer / secondary carrier @SiO 2 ;

[0036] Step 4: Selectively deposit the active component noble metal on the primary carrier / stabilizer / secondary carrier @SiO obtained in step 3 2 The surface of the primary support in the medium is obtained as a supported noble metal catalyst.

[0037] According to the present invention, MO is added to the soluble precursor of the primary carrier x...

Embodiment 1

[0068] Weigh 0.8g PVP, 138.9mg Ce(NO 3 ) 3 ·6H 2 O and 11.6mg Ni(NO 3 ) 3 ·6H 2 O was dissolved in 80mL of absolute ethanol, and after it was fully dissolved, 0.6mL of precipitant triethylamine was added dropwise and stirred for 0.5h, then heated at 180°C for 24h to obtain Ce 0.8 Ni 0.2 o 2 nanocomposite oxides.

[0069] Weigh 100mg commercial Al 2 o 3 , add 18mL Ce 0.8 Ni 0.2 o 2 The sol was first stirred at room temperature for 2 hours, then stirred and evaporated to dryness at 50° C., then heated to 500° C. at a heating rate of 3° C. / min, and calcined in air for 5 hours. at 5%H 2 / Ar heated at 10°C / min to 300°C, reduced for 3 hours, then raised to 750°C at a rate of 3°C / min in air atmosphere and calcined for 3 hours to obtain Ce 0.8 Ni 0.2-δ o 2-θ / NiAl 2 o 4 / Al 2 o3 catalyst.

[0070] Weigh Ce 0.8 Ni 0.2-δ o 2-θ / NiAl 2 o 4 / Al 2 o 3 Catalyst 50mg was dispersed in 80mL absolute ethanol, ammonia water 4mL was added and sonicated for 30min. Measu...

Embodiment 2

[0082] Weigh 3.2g ZrOCl 2 ·8H 2 O and 0.58g Ni(NO 3 ) 3 ·6H 2 O was dissolved in 20mL of secondary water, and Zr was weighed 4+ and Ni 2+ 6.2 g of the ligand sodium oleate was dissolved in a mixed solution of 40 mL of secondary water and 50 mL of absolute ethanol. Then the above two solutions were mixed, stirred and reacted for 1 hour, then 80 mL of cyclohexane was added to continue stirring and extracting for 1 hour, then transferred to a separatory funnel, allowed to stand for 2 hours and the upper layer solution was collected. Transfer the supernatant to a round-bottomed flask, and distill at 100°C under normal pressure to obtain a yellow viscous liquid. Add cyclohexane solution to the yellow viscous liquid and dilute to 20mL, Zr 0.8 Ni 0.2 o 2 The sol is sealed and stored.

[0083] 100mg commercial Al 2 o 3 Stir and mix with 2mL of the above sol for 2h, then stir and evaporate to dryness at 80°C, and successively in N 2 and in air at a rate of 3°C / min to 500°C...

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Abstract

The invention provides a supported noble metal catalyst with the performance of resisting high-temperature sintering and a preparing method thereof, and belongs to the technical field of catalysis. The supported noble metal catalyst comprises a second carrier, first carriers dispersed on the surface of the second carrier, a spinel stabilizer Mal2O4 located between the first carrier layer and the second carrier layer, active components dispersed on the surfaces of the first carriers and a silicon dioxide coating layer coating the surface of the second carrier; the second carrier is Al2O3, doping vario-property Al2O3 or hexaaluminate; the first carriers are nano particles of TiO2, CeO2, ZrO2, CexZr(1-x)O2 or modified CexZr(1-x)O2; the active components are noble metal Au, Pt, Pd, Rh, Ir or Ru. The invention further provides a preparing method of the supported noble metal catalyst with the performance of resisting high-temperature sintering. The supported noble metal catalyst can still maintain a high catalytic activity after being subjected to heat treatment under the condition of 800 DEG C to 1,100 DEG C.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a supported noble metal catalyst with high temperature sintering resistance and a preparation method thereof. Background technique [0002] Supported noble metal catalysts are widely used in many fields such as the elimination of volatile organic pollutants, petroleum refining, and automobile exhaust purification due to their excellent catalytic performance. Although noble metal nanoparticles show excellent catalytic performance and unique size effect in many reactions, due to the presence of a large number of low-coordination metal atoms on the surface of small-sized nanoparticles, they have high surface energy, so nanoparticles can It is very easy to sinter and grow, which leads to the reduction of the catalytic activity of the catalyst or the selectivity of the target product. Therefore, the commercial application of supported noble metal catalysts for high-temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89
CPCB01J23/002B01J23/892B01J23/894B01J23/8946B01J2523/00B01J2523/31B01J2523/3712B01J2523/41B01J2523/828B01J2523/847B01J2523/48B01J2523/822B01J2523/17B01J2523/19B01J2523/25B01J2523/47
Inventor 杨向光李经纬张一波
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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