A kind of highly active lanthanum cobalt composite oxide catalyst and its 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 highly active lanthanum-cobalt composite oxide catalyst, a preparation method and an application. Background technique [0002] With the rapid development of the national economy and the acceleration of urbanization, the problem of environmental pollution in my country is deteriorating day by day, which seriously threatens the ecological environment and human life and health. Surveys show that motor vehicle emissions have become one of the main causes of environmental pollution. The 2012 "Annual Report on the Prevention and Control of Motor Vehicle Pollution in China" pointed out that the total discharge of four pollutants from motor vehicles nationwide was 46.079 million tons, an increase of 3.5% over 2010. Among them, 34.671 million tons of carbon monoxide (CO), 4.413 million tons of hydrocarbons (HC), and nitrogen oxides (NO x ) 6.375 million tons, and particulate matter...

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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