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Preparation method of Pt-PbTiO3 nano-catalyst for CO catalytic oxidation

A nano-catalyst and catalytic oxidation technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. It is difficult to control problems such as high catalytic oxidation efficiency, high catalytic activity at low temperature, and simple process.

Active Publication Date: 2015-04-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, people's research on metal catalysts is limited to pure noble metal systems. This kind of catalytic system is costly, the process is difficult to control, the catalytic activity is not high, and the catalyst is easy to deactivate.

Method used

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  • Preparation method of Pt-PbTiO3 nano-catalyst for CO catalytic oxidation
  • Preparation method of Pt-PbTiO3 nano-catalyst for CO catalytic oxidation
  • Preparation method of Pt-PbTiO3 nano-catalyst for CO catalytic oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) 0.5 g perovskite phase PbTiO prepared by hydrothermal method 3 Add single crystal nanoparticles into 50ml deionized water, and ultrasonically disperse for 15 minutes to obtain water-dispersed PbTiO 3 suspension;

[0018] 2) In the state of ultrasonic dispersion, disperse PbTiO into the water prepared in step 1) 3 Add 2ml of 50mmol / L H 2 PtCl 6 6H 2 O solution, ultrasonically dispersed for 15 minutes to obtain an ion suspension of lead, titanium and platinum;

[0019] 3) In the state of ultrasonic dispersion, slowly add 60ml of NaBH with a concentration of 0.2 mol / L to the ion suspension of lead, titanium and platinum prepared in step 2) 4 Solution, ultrasonically dispersed for 10min to obtain amorphous Pt-PbTiO 3 Nanoparticle suspension;

[0020] 4) The amorphous Pt-PbTiO obtained in step 3) 3 The nanoparticle suspension was centrifuged to obtain a black precipitate, which was washed with deionized water and ethanol successively until the eluate was neutral,...

Embodiment 2

[0022] 1) 1 g of perovskite phase PbTiO prepared by hydrothermal method 3 Add single crystal nanoparticles into 100ml deionized water, and ultrasonically disperse for 15 minutes to obtain water-dispersed PbTiO 3 suspension;

[0023] 2) In the state of ultrasonic dispersion, disperse PbTiO into the water prepared in step 1) 3 Add dropwise 5ml of H2O with a concentration of 60mmol / L to the suspension 2 PtCl 6 6H 2 O solution, ultrasonically dispersed for 15 minutes to obtain an ion suspension of lead, titanium and platinum;

[0024] 3) In the state of ultrasonic dispersion, slowly add 60ml of NaBH with a concentration of 0.3 mol / L to the ion suspension of lead, titanium and platinum prepared in step 2) 4 Solution, ultrasonically dispersed for 10min to obtain amorphous Pt-PbTiO 3 Nanoparticle suspension;

[0025] 4) The amorphous Pt-PbTiO obtained in step 3) 3 The nanoparticle suspension was centrifuged to obtain a black precipitate, which was washed with deionized water...

Embodiment 3

[0027] 1) 1.5 g perovskite phase PbTiO prepared by hydrothermal method 3 Add single crystal nanoparticles into 200ml deionized water, and ultrasonically disperse for 15 minutes to obtain water-dispersed PbTiO 3 suspension;

[0028] 2) In the state of ultrasonic dispersion, disperse PbTiO into the water prepared in step 1) 3 Add dropwise 6ml of H2O with a concentration of 70mmol / L to the suspension 2 PtCl 6 6H 2 O solution, ultrasonically disperse for 20 minutes to obtain an ion suspension of lead, titanium and platinum;

[0029] 3) In the state of ultrasonic dispersion, slowly add 60ml of NaBH with a concentration of 0.4 mol / L to the ion suspension of lead, titanium and platinum prepared in step 2) 4 Solution, ultrasonically dispersed for 10min to obtain amorphous Pt-PbTiO 3 Nanoparticle suspension;

[0030] 4) The amorphous Pt-PbTiO obtained in step 3) 3 The nanoparticle suspension was centrifuged to obtain a black precipitate, which was washed with deionized water a...

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Abstract

The invention discloses a preparation method of a Pt-PbTiO3 nano-catalyst for CO catalytic oxidation. The preparation method is characterized in that a wet chemical reaction method is adopted; tetragonal perovskite Pb-TiO3 nano-particles synthesized by a hydrothermal method, H2PtCl6.6H2O, NaBH4 and deionized water are used as reaction raw materials; and through reducibility of NaBH4, Pt is reduced on the surfaces of the Pb-TiO3 nano-particles so that unstable Pt nano-particles are formed, and in follow-up drying, the unstable Pt nano-particles are completely crystallized so that the Pt-PbTiO3 nano-catalyst for CO catalytic oxidation is obtained. The preparation method has simple processes, can be controlled easily, has low pollution and a low cost and is suitable for large-scale production. The Pt-PbTiO3 nano-catalyst is stable, and has high purity, high CO catalytic oxidation efficiency and high low-temperature catalytic activity.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for catalytic oxidation of CO, specifically a Pt-PbTiO catalyst for catalytic oxidation of CO 3 Preparation methods of nanocatalysts. Background technique [0002] ferroelectric oxide PbTiO 3 It is a typical perovskite structure material with simple structure and excellent ferroelectric, piezoelectric and dielectric properties. PbTiO 3 Has a high ferroelectric phase transition (Curie temperature (490 o C) and high spontaneous polarizability, it has a wide range of applications in the preparation of microelectronic devices such as non-volatile ferroelectric memory, piezoelectric sensors, pyroelectric sensors and high dielectric capacitors. In recent years, researchers have found that the size effect of ferroelectric nanomaterials has a great impact on the overall performance of the material, especially the surface properties, making the surface chemical properties, surface polarization and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62
Inventor 任召辉尹思敏韩高荣肖珍钞春英刘振亚沈鸽
Owner ZHEJIANG UNIV
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