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m y /la x sr 1-x ti 1-y o 3 Catalyst, its preparation method and application

A catalyst and solvent technology, applied in the field of catalyst preparation, can solve the problems of unsatisfactory catalytic results of doped precious metal surface precipitation, serious influence of internal diffusion, disordered and uneven pores, etc., to achieve product structure and composition controllable, reduce catalyst Cost, effect of low content of precious metal active ingredients

Active Publication Date: 2021-06-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalysts synthesized by these methods have small pore size, serious influence of internal diffusion, disordered and inhomogeneous pores, and less precipitation on the surface of doped noble metals, resulting in unsatisfactory catalytic results.

Method used

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  • m <sub>y</sub> /la <sub>x</sub> sr <sub>1-x</sub> ti <sub>1-y</sub> o <sub>3</sub> Catalyst, its preparation method and application
  • m <sub>y</sub> /la <sub>x</sub> sr <sub>1-x</sub> ti <sub>1-y</sub> o <sub>3</sub> Catalyst, its preparation method and application

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preparation example Construction

[0037] Another aspect of the embodiment of the present invention also provides a M y / La x Sr 1-x Ti 1-y o 3 The preparation method of catalyst, it comprises:

[0038] The mixed metal precursor system is mixed with the hard template microspheres and calcined at high temperature to obtain a three-dimensional ordered mesoporous perovskite structure noble metal-doped La x Sr 1-x Ti 1-y m y o 3 A catalyst precursor, wherein x is 0.05 to 0.95, y is 0.01 to 0.1, M is a noble metal doping active component, and the value of y ensures that the noble metal doping active component M is less than or equal to the saturation doping amount, and the metal precursor The mixed compound system includes the combination of La-containing compound, Sr-containing compound, Ti-containing compound and noble metal precursor;

[0039] Carry out reduction treatment to described catalyst precursor in reducing atmosphere, make M y / La x Sr 1-x Ti 1-y o 3 A catalyst, wherein the catalyst includ...

Embodiment 1

[0071] A kind of 2.77wt%Pd that present embodiment relates to 0.05 / La 0.1 Sr 0.9 Ti 0.95 o 3 The preparation technology of catalyst comprises the steps:

[0072] (1) Preparation of PMMA hard sphere templates with a size of about 200nm

[0073] Add 650ml deionized water into a 1000ml three-neck flask, 2 Under the atmosphere, with 350rpm and 70 ℃ of continuous bubbling stirring, after 30 minutes, add 55 mg of methyl methacrylate (PMMA) solution mixed with 0.03% p-hydroxybenzoic acid, after heating at 70 ℃ for 15 minutes, add potassium persulfate to trigger agent solution, heated and stirred for 40 minutes, centrifuged and dried to obtain a PMMA hard sphere template with a size of about 200nm, see figure 2 shown.

[0074] (2) Three-dimensional ordered mesoporous perovskite structure La 0.1 Sr 0.9 Ti 0.95 PD 0.05 o 3 Synthesis of vector

[0075] 0.4330g La(NO 3 ) 3 ·6H 2 O, 1.9047g Sr(NO 3 ) 2 , 3.23g Ti(OC 4 h 9 ) 4 , 0.3547gPd(NO 3 ) 2 The nitrate mixtur...

Embodiment 2

[0089] A kind of 0.457wt%Pd that present embodiment relates to 0.01 / La 0.95 Sr 0.05 Ti 0.99 o 3 The preparation technology of catalyst comprises the steps:

[0090] (1) Preparation of PMMA hard sphere templates with a size of about 300nm

[0091] Add 650ml deionized water into a 1000ml three-neck flask, 2 Under the atmosphere, with 350rpm and 70 ℃ of continuous bubbling stirring, after 30 minutes, add 55 mg of methyl methacrylate (PMMA) solution mixed with 0.03% p-hydroxybenzoic acid, after heating at 70 ℃ for 15 minutes, add potassium persulfate to trigger agent solution, heated and stirred for 40 minutes, centrifuged and dried to obtain a PMMA hard sphere template with a size of about 300nm, see figure 2 shown.

[0092] (2) Three-dimensional ordered mesoporous perovskite structure La 0.95 Sr 0.05 Ti 0.99 PD 0.01 o 3 Synthesis of vector

[0093] 4.1135g La(NO 3 ) 3 ·6H 2 O, 0.1058g Sr(NO 3 ) 2 , 3.37g Ti(OC 4 h 9 ) 4 , 0.07gPd(NO 3 ) 2 The nitrate mix...

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Abstract

The invention discloses a M y / La x Sr 1‑x Ti 1‑y o 3 Catalysts, their preparation and applications. The chemical formula of the catalyst is M y / La x Sr 1‑x Ti 1‑y o 3 , where M is the noble metal doping active component, La x Sr 1‑x Ti 1‑y o 3 It is an oxide carrier, x is 0.05-0.95, and y is 0.01-0.1. The oxide carrier has a three-dimensional ordered mesoporous perovskite structure, and noble metal-doped active components are evenly loaded on the oxide carrier. The preparation method includes: mixing the metal precursor mixed system with the hard template microspheres, and calcining at a high temperature to obtain La x Sr 1‑x Ti 1‑y m y o 3 Catalyst precursor, followed by reduction treatment to obtain M y / La x Sr 1‑x Ti 1‑y o 3 catalyst. The preparation process of the catalyst of the invention is simple and controllable, and the surface of the obtained catalyst uniformly disperses noble metal active components, and has high catalytic activity.

Description

technical field [0001] The present invention relates to catalysts, in particular to a three-dimensional ordered mesoporous perovskite structure M with uniformly dispersed noble metal active components on the surface y / La x Sr 1-x Ti 1-y o 3 The catalyst and its preparation method and application belong to the technical field of catalyst preparation. Background technique [0002] In recent years, green-friendly chemistry has been the focus of development. Air pollution caused by incomplete combustion of automobile exhaust and Pt electrode poisoning caused by impure substances in syngas in fuel cells are the core problems that scientists have solved in the era. Most of the catalysts currently used to solve these problems are noble metal supported oxide supports, including Au / Al 2 o 3 , Pt / TiO 2 , Pt / CeO 2 -TiO 2 , Pt / Al 2 o 3 , Fe 2 o 3 -Cr 2 o 3 , CuO-ZnO, etc. Although these catalysts have simple preparation procedures and high activity of noble metals, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J23/66B01J35/10B01J37/08B01J37/16C10K3/04
CPCB01J23/002B01J23/63B01J23/66B01J35/10B01J35/1014B01J35/1019B01J37/0018B01J37/16B01J2523/00C10K3/04B01J2523/3706B01J2523/24B01J2523/47
Inventor 梁萧雅尹宏峰余小龙
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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