3results about How to "Improve catalytic combustion performance" patented technology

The application discloses a catalyst for catalytic combustion of chlorine-containing organic matters and a preparation method and application thereof, and belongs to the technical field of environmental protection catalysts. In the application, the composite oxide active component is loaded on a molecular sieve through an impregnation method, and then the noble metal active component is adsorbed on the surface of the composite oxide active component through an electrostatic adsorption method, so that the noble metal is stabilized by using the strong interaction between the noble metal and the oxide, the utilization rate of the noble metal catalyst is improved, the activity and stability of the catalytic combustion of the chlorine-containing organic waste gas are improved, and the industrialization of the treatment of the chlorine-containing volatile organic matters by the catalytic combustion has important significance.

This invention discloses a lanthanum-based perovskite-supported noble metal catalyst, its preparation method, and its application in the catalytic oxidation of low-carbon alkanes. The invention involves dissolving lanthanum salt, manganese salt, and citric acid in an organic solvent to prepare a metal cation solution, which is then stirred to obtain a sol. After standing, a wet gel is obtained; this gel is dried and heat-treated to obtain lanthanum-based perovskite. A non-noble metal salt is dissolved in an acidic potassium permanganate solution to prepare a mixed solution. The lanthanum-based perovskite is dispersed in the mixed solution, heated, filtered, washed, and heat-treated. The pretreated lanthanum-based perovskite is dispersed in a noble metal salt solution, allowed to stand, dried, and heat-treated to obtain the target catalyst. This invention introduces active components in situ through acidic potassium permanganate pretreatment, resulting in a high specific surface area and highly active support, improving the dispersion of noble metals and promoting the interaction between noble metals and the support. The catalyst of this invention exhibits excellent catalytic combustion performance for low-carbon alkanes such as ethane and propane, and strong thermal stability.

The present invention discloses a preparation method and application of a phosphorus-modified perovskite oxide-loaded noble metal catalyst, and belongs to the technical field of organic waste gas treatment. The present invention provides noble metal-specific anchoring sites through phosphorus-modified perovskite oxides, promotes the dispersion of noble metal nanoparticles, and stabilizes the noble metal nanoparticles. In addition, the electron-rich characteristics of the outer layer of phosphorus are utilized to reduce the electron density of the noble metal, thereby enhancing its ability to activate molecular oxygen at low temperatures. Ultimately, the catalytic activity and stability of the loaded noble metal catalyst are significantly improved, and the method is suitable for phosphorus-modified different perovskite oxides to load different noble metal catalysts. The processing method is simple, and the catalytic combustion performance of the catalyst for VOCs (especially toluene) is significantly improved, and the performance is stable. Moreover, during the entire reaction process of the present invention, no toxic or harmful substances are used or produced, which fully meets the requirements of clean production.