Hollow fiber net-shaped perovskite catalyst, and preparation method and applications thereof

A fibrous mesh and catalyst technology, which is applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of particle pore size and PM contact, toxicity, etc. Active, easy-to-use effect of spinning technology

Inactive Publication Date: 2019-08-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for diesel vehicles to solve the problem that the perovskite powder catalyst particle diameter is small so that it is not easy to contact with PM, and the organic solvents commonly used in electrospinning technology are toxic. Preparation method of hollow fiber mesh perovskite catalyst for catalytic purification of exhaust gas

Method used

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  • Hollow fiber net-shaped perovskite catalyst, and preparation method and applications thereof
  • Hollow fiber net-shaped perovskite catalyst, and preparation method and applications thereof

Examples

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Embodiment 1

[0031] The present embodiment provides a kind of hollow fiber mesh perovskite catalyst is La 0.9 Sr 0.1 MnO 3 , the preparation method of described catalyst comprises the following steps:

[0032] (1) Measure 10 mL of deionized water and 5 mL of absolute ethanol in a beaker, and stir for 10 min to obtain an aqueous ethanol solution. Weigh 2.456g of anhydrous lanthanum nitrate, 0.178g of strontium nitrate, and 3.008g of manganese nitrate solution with a mass fraction of 50% and dissolve them in an aqueous ethanol solution, stir and dissolve at room temperature to obtain a metal salt solution with a metal ion concentration of 1.12mol / L. Weigh 3.528g of citric acid monohydrate into the metal salt solution, the molar ratio of metal ions and citric acid in the metal salt solution is 1:1, and continue to stir until the metal salt solution is clear to obtain a mixed solution. Then 11.5g of PVP (K90) was weighed and poured into a beaker containing the mixed solution, the mass ratio...

Embodiment 2

[0039] The present embodiment provides a kind of hollow fiber mesh perovskite catalyst is La 0.9 Sr 0.1 MnO 3 , the preparation method of described catalyst comprises the following steps:

[0040] Measure 10 mL of deionized water and 5 mL of absolute ethanol in a beaker, and stir for 10 min to obtain an aqueous ethanol solution. Weigh 2.456g of anhydrous lanthanum nitrate, 0.178g of strontium nitrate, and 3.008g of manganese nitrate solution with a mass fraction of 50% and dissolve them in aqueous ethanol solution, stir and dissolve at room temperature to obtain a metal salt solution with a metal ion concentration of 1.12mol / L. Weigh 3.528g of citric acid monohydrate into the metal salt solution, the molar ratio of metal ions and citric acid in the metal salt solution is 1:1, and continue to stir until the metal salt solution is clear to obtain a mixed solution. Then 1.16g of PVP (K90) was weighed and poured into a beaker containing the mixed solution, the mass ratio of the...

Embodiment 3

[0045] The present embodiment provides a kind of hollow fiber mesh perovskite catalyst is La 0.9 Sr 0.1 MnO 3 , the preparation method of described catalyst comprises the following steps:

[0046] Measure 10 mL of deionized water and 5 mL of absolute ethanol in a beaker, and stir for 10 min to obtain an aqueous ethanol solution. Weigh 2.456g of anhydrous lanthanum nitrate, 0.178g of strontium nitrate, and 3.008g of manganese nitrate solution with a mass fraction of 50% and dissolve them in aqueous ethanol solution, stir and dissolve at room temperature to obtain a metal salt solution with a metal ion concentration of 1.12mol / L. Weigh 3.528g of citric acid monohydrate into the metal salt solution, the molar ratio of metal ions and citric acid in the metal salt solution is 1:1, and continue to stir until the metal salt solution is clear to obtain a mixed solution. Then 0.46g of PVP (K90) was weighed and poured into the beaker containing the mixed solution, the mass ratio of t...

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Abstract

The invention discloses a hollow fiber net-shaped perovskite catalyst, and a preparation method and applications thereof. The chemical general formula of the catalyst is La<1-x>Sr<x>MnO3, 0<=x<=0.4; the catalyst is designed to shape like a net, and is provided with hollow tubular channels, the pore diameter is controlled to be 200 to 300nm. According to the preparation method, water-ethanol is taken as a solvent system for static spinning, so that introduction of organic solvents harmful for human body is avoided, and the system is safe, and is friendly to the environment. The hollow fiber net-shaped perovskite catalyst is capable of capturing carbon smoke particles in diesel car tail gas, increasing contact opportunity of catalyst active sites with carbon smoke and nitrogen oxides, realizing cooperative removing of carbon smoke and nitrogen oxides, and reducing pollutant discharge amount of tail gas. In a simulation test of eliminating of carbon smoke and nitrogen oxides in diesel cartail gas, high activity is achieved, carbon smoke particle combustion peak temperature is 360 DEG C, NO largest conversion rate is 40%, and the peak temperature is 380 DEG C.

Description

technical field [0001] The invention belongs to the technical field of diesel vehicle exhaust catalysts, in particular to a hollow fiber mesh perovskite catalyst and its preparation method and application. Background technique [0002] Compared with gasoline vehicles, diesel vehicles have the advantages of higher thermal efficiency and stronger economy, and have broad market prospects. The main components of automobile exhaust are PM (soot), NO x (nitrogen oxides), CO (carbon monoxide), C x h y (hydrocarbons) four, while diesel vehicle exhaust is PM and NO x Mainly. With the introduction of increasingly strict national environmental protection laws and regulations, the emission content of diesel vehicle exhaust has received more stringent attention, which is a current research hotspot. The main method of PM removal is to filter PM by exhaust gas filter, and use the catalyst loaded on the filter to oxidize PM into carbon dioxide at the exhaust temperature. while for NO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/10B01J35/02F01N3/28
CPCB01J23/002B01J23/34B01J35/02B01J35/1066B01J2523/00F01N3/28F01N2570/14B01J2523/24B01J2523/3706B01J2523/72Y02A50/20
Inventor 彭峰陈伟强曹永海余晧王红娟
Owner SOUTH CHINA UNIV OF TECH
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