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A kind of regular structure Pt single atom dispersed catalyst and preparation method thereof

A technology of atomic dispersion and regular structure, which is applied in the field of Pt single-atom dispersed catalysts with regular structure and its preparation, can solve the problems of insufficient stability of Pt single-atom catalysts and cumbersome preparation process of structured catalysts, and achieve the reduction of the amount of precious metals and easy promotion , cost-saving effect

Active Publication Date: 2019-06-04
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a Pt single-atom dispersed catalyst with a regular structure and a preparation method thereof that can solve the problems of insufficient stability of the existing Pt single-atom catalyst and the cumbersome preparation process of the structured catalyst.

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  • A kind of regular structure Pt single atom dispersed catalyst and preparation method thereof
  • A kind of regular structure Pt single atom dispersed catalyst and preparation method thereof
  • A kind of regular structure Pt single atom dispersed catalyst and preparation method thereof

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preparation example Construction

[0037] Such as figure 1 As shown, according to an exemplary embodiment of the present invention, the preparation method of the Pt single-atom dispersed catalyst with a regular structure includes the following steps.

[0038] Step A:

[0039] CeO 2 -ZrO 2 The oxide solid solution powder is wet-milled with water to form an oxide slurry, and the catalyst substrate is soaked in an acid solution and then cleaned and dried.

[0040] This step is the pretreatment step of the catalyst substrate, and the oxide (CeO 2 -ZrO 2 ) slurry for subsequent coating of the catalyst substrate.

[0041] Preferably, the CeO 2 -ZrO 2 The oxide solid solution powder and water are ball milled in a high-energy ball mill for 10-15 hours to obtain the above-mentioned oxide slurry; and the above-mentioned catalyst substrate is soaked in a dilute nitric acid solution with a mass concentration of 5-10% for 20-24 hours, then washed and dried, wherein , preferably nitric acid is used to soak the cataly...

Embodiment 1

[0069] (1) preparation mass concentration is 0.5% H 2 PtCl 6 .6H 2 O solution, according to the Pt loading of 1%, weigh the corresponding activated alumina powder into the H 2 PtCl 6 .6H 2 O solution was stirred in a water bath at 40°C, and the temperature was raised to 80°C to slowly evaporate the solvent; after drying at 120°C, it was baked in a muffle furnace at 500°C to produce 1% Pt / Al 2 o 3 catalyst powder;

[0070] (2) Soak the honeycomb cordierite ceramics as a catalyst substrate in 5% dilute nitric acid solution for 20 hours, then take it out for cleaning and drying;

[0071] (3) CeO 2 -ZrO 2 The oxide solid solution powder is added with water and ball-milled in a high-energy ball mill for 12 hours to form an oxide slurry;

[0072] (4) adding the dried catalyst substrate and the oxide slurry into an ultrasonic cleaner and coating the substrate under ultrasonic vibration conditions, then taking it out for drying and roasting;

[0073] (5) Repeat step (4) unti...

Embodiment 2

[0080] (1) preparation mass concentration is 1% H 2 PtCl 6 .6H 2 O solution, according to the Pt loading of 2%, weigh the corresponding activated alumina powder into the H 2 PtCl 6 .6H 2 O solution was stirred in a water bath at 45°C, and the temperature was raised to 90°C to slowly evaporate the solvent; after drying at 130°C, it was baked in a muffle furnace at 550°C to produce 2% Pt / Al 2 o 3 catalyst powder;

[0081] (2) Soak the honeycomb cordierite ceramics as a catalyst substrate in 8% dilute nitric acid solution for 22 hours, then take it out for cleaning and drying;

[0082] (3) CeO 2 -ZrO 2 The oxide solid solution powder is added with water and ball-milled in a high-energy ball mill for 14 hours to form an oxide slurry;

[0083] (4) adding the dried catalyst substrate and the oxide slurry into an ultrasonic cleaner and coating the substrate under ultrasonic vibration conditions, then taking it out for drying and roasting;

[0084] (5) Step (4) is repeated u...

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Abstract

The invention discloses a regular structure Pt single atom dispersed catalyst and a preparation method thereof: wet-grinding CeO2-ZrO2 oxide solid solution powder with water to form an oxide slurry, soaking the catalyst substrate in an acid solution, cleaning and drying; The dried catalyst substrate is immersed in the oxide slurry for coating treatment, and then the catalyst substrate is taken out, dried and roasted; the above steps are repeated until the catalyst substrate increases in weight by 10 to 20 wt% to obtain a structured catalyst carrier; the structured catalyst carrier is buried in into Pt / Al2O3 catalyst powder and calcined in an air atmosphere, and then taken out from the Pt / Al2O3 catalyst powder to obtain a regular structure Pt single atom dispersed catalyst. The catalyst prepared by the invention has a regular honeycomb structure in which the active element Pt is dispersed as single atoms. There is a strong interaction between Pt and the carrier in the catalyst, and agglomeration and sintering of Pt will not occur, and it has good stability. sex.

Description

technical field [0001] The invention belongs to the technical field of catalyst synthesis, and more specifically relates to a Pt single-atom dispersed catalyst with a regular structure and a preparation method thereof. Background technique [0002] The noble metal Pt is widely used in various catalysts due to its outstanding catalytic activity. In order to improve its utilization, Pt is often supported on the surface of a high surface area carrier. The dispersion degree of Pt in the supported catalyst is very important to the catalytic performance. The higher the dispersion degree, the better the catalytic activity, and the smaller the Pt particles, the higher the utilization rate. [0003] However, during use, Pt will agglomerate and sinter (especially at high temperature), which is an important reason for the deactivation and deactivation of supported catalysts. The use of reducible oxides as catalyst supports can prevent the agglomeration and sintering of Pt to a certain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J35/04
CPCB01J23/63B01J35/56
Inventor 巫泉文闫霞艳把静文包锦春戴丹玲刘卫东蒙大桥
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS