High-activity lanthanum and cobalt composite oxide catalyst, preparation and application

Abstract

A high-activity lanthanum and cobalt composite oxide catalyst is a composite oxide of lanthanum and cobalt and non-noble metal catalyst; and fluorine is doped in the composite oxide at different degrees. Lanthanum and cobalt soluble salt and citric acid are dissolved in absolute ethyl alcohol, and the molar ratio of citric acid and metal ions is 2-5; a hydrofluoric acid solution is added dropwise while stirred until the solution is turned into gel; drying is performed at the temperature of 100-160 DEG C, calcination is performed at the temperature of 200-500 DEG C for 2-6 hours, and the high-activity lanthanum and cobalt composite oxide catalyst is obtained. The composite oxide catalyst has the characteristics of economy, low price, simple preparation and the like. The catalyst has higher deep catalytic oxidation activity of propane, and propane with a concentration of 200 ppm (parts per million) can be fully converted at the temperature of 300 DEG C under the condition that the air speed is 100,000 mLg<-1>cath<-1>. Milder and more economic deep catalytic oxidation of propane is hopeful to realize by the aid of the catalyst.

Description

Technical field [0001] The invention relates to the technical field of catalysts, in particular to a high-activity lanthanum-cobalt composite oxide catalyst, and a preparation method and application. Background technique [0002] With the rapid development of the national economy and the acceleration of the pace of urbanization, my country's environmental pollution problem is getting worse, seriously threatening the ecological environment and human life and health. The survey shows that motor vehicle emission pollution has become one of the main causes of environmental pollution. The 2012 "China Motor Vehicle Pollution Prevention and Control Annual Report" pointed out that the total emission of four pollutants from motor vehicles nationwide was 46.079 million tons, an increase of 3.5% over 2010. Among them, carbon monoxide (CO) 34.671 million tons, hydrocarbons (HC) 4.413 million tons, nitrogen oxides (NO x ) 6.375 million tons and 621,000 tons of particulate matter (PM). [0003...

AI Technical Summary

Problems solved by technology

However, there are few reports on the treatment of HC with high concentration in road tunnels in my country

However, most HCs are toxic, and some HCs are even potential carcinogens

In addition, under strong sunlight, HC and NO x Photochemical reactions occur, which may lead to photochemical smog pollution, causing more serious impacts on human health and the ecological environment

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