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My/LaxSr(1-x)Ti(1-y)O3 catalyst as well as preparation method and application thereof

A catalyst and compound technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of unsatisfactory catalytic results and internal diffusion of doped noble metal surface precipitation Serious impact, disordered and uneven pores, etc., to achieve the effects of adjustable product structure and composition, reduced catalyst cost, and low content of noble metal active components

Active Publication Date: 2018-07-20
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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  • My/LaxSr(1-x)Ti(1-y)O3 catalyst as well as preparation method and application thereof
  • My/LaxSr(1-x)Ti(1-y)O3 catalyst as well as preparation method and application thereof

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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, and M is a noble metal doping active component, wherein 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 catalys...

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 an My / LaxSr(1-x)Ti(1-y)O3 catalyst as well as a preparation method and an application thereof. The chemical formula of the catalyst is My / LaxSr(1-x)Ti(1-y)O3, wherein M is a precious metal doped active component, LaxSr(1-x)Ti(1-y)O3 is an oxide support, x ranges from 0.05 to 0.95, and y ranges from 0.01 to 0.1. The oxide support is of a 3D ordered mesoporous perovskite structure, and the precious metal doped active component is uniformly supported on the oxide support. The preparation method comprises the following steps: a metal precursor mixed system is mixed with hard template microspheres, the mixture is subjected to high-temperature calcination, and a LaxSr(1-x)Ti(1-y)O3 catalyst precursor is obtained; then reduction treatment is performed, and the My / LaxSr(1-x)Ti(1-y)O3 catalyst is prepared. The preparation process of the catalyst is simple and controllable, the precious metal doped active component is uniformly dispersed on the catalyst surface, and the catalytic activity is high.

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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IPC IPC(8): B01J23/63B01J23/66B01J35/10B01J37/08B01J37/16C10K3/04
CPCC10K3/04B01J23/002B01J23/63B01J23/66B01J37/0018B01J37/16B01J2523/00B01J35/60B01J35/613B01J35/615B01J2523/3706B01J2523/24B01J2523/47
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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