SiOC porous ceramics-loaded La0.9Sr0.1CoO3 nano particle catalyst prepared by fibre template method

Abstract

The invention discloses an SiOC porous ceramics-loaded La0.9Sr0.1CoO3 nano particle catalyst prepared by a fibre template method, which is prepared by the following steps of: firstly, preparing La0.9Sr0.1CoO3 gel by utilizing a gum gelling method, carrying out electrostatic spinning on the prepared sol gel, then placing the prepared gel fibre in SiOC precursor sol so as to obtain a precursor of the catalyst, and finally, carrying out thermal decomposition so as to obtain the SiOC porous ceramics-loaded La0.9Sr0.1CoO3 nano particle catalyst prepared by the fibre template method. According to the SiOC porous ceramics-loaded La0.9Sr0.1CoO3 nano particle catalyst prepared by the fibre template method, the defect of a coating process of a traditional catalyst is overcome, and a catalyst and a carrier are compounded, i.e. oxide gel fibre with ordered arrangement is used as a template construction passage so as to obtain a catalyst-loaded carrier with a porous structure by cross linkage, thermal decomposition and in-situ preparation. The catalyst has favorable performance of removing NOx and is suitable for the after-treatment of the tail gas of a diesel engine. The process of a preparation method of the SiOC porous ceramics-loaded La0.9Sr0.1CoO3 nano particle catalyst prepared by the fibre template method is simple.

Description

technical field [0001] The invention belongs to perovskite type catalyst technology, more specifically, relates to a kind of SiOC-based porous ceramics loaded La 0.9 Sr 0.1 CoO 3 Nanoparticle catalyst and method for its preparation. Background technique [0002] In recent years, with a series of advantages such as wide power range, high fuel thermal efficiency, and low carbon monoxide (CO) and hydrocarbon (HC) emissions, diesel engines have increased their share in the motor vehicle market year by year. However, diesel engines are difficult to deal with in terms of NOx emission control. This is because the temperature and pressure of the combustion chamber of the diesel engine are relatively high during operation, and more air is sucked into the combustion chamber, so the oxygen and nitrogen in the remaining air in the combustion chamber are very low. It is easy to generate NOx under the conditions of high temperature and high pressure; because NOx has great harm to the e...

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Problems solved by technology

However, diesel engines are difficult to deal with in terms of NOx emission control. This is because the temperature and pressure of the combustion chamber of the diesel engine are relatively high during operation, and more air is sucked into the combustion chamber, so the oxygen and nitrogen in the remaining air in the combustion chamber are very low. It is easy to generate NOx under the conditions of high temperature and high pressure; because NOx has great harm to the environment and human health, with people's increasing attention to the environment and the implementation of stricter diesel engine emission regulations, NOx in diesel engine exhaust has become a diesel engine exhaust gas. Major Limiting Factors for Widespread Use in Urban Areas

At present, catalysts for removing NOx from diesel engine exhaust are mainly coated on wall-flow honeycomb ceramics, but during the coating process, it is easy to involve the distribution of the catalyst on the surface of the carrier, particle size, catalyst activity, and reaction with the carrier. series of questions

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