Cellular ceramic type catalyst for catalytic combustion of perovskite as well as preparation and application thereof

Abstract

The invention discloses a honeycomb ceramics perovskite catalytic combustion catalyst; the honeycomb ceramics with a metal oxide coating is used as a carrier; the catalytic activity components disclosed in formula (I) are loaded; wherein, La, Sr, Co, and Mn respectively represent lanthanum, strontium, cobalt, and manganese; x is equal to 0 to 0.7 and y is equal to 0 to 0.7; the honeycomb ceramics with a metal oxide coating is to load a metal oxide coating of gamma-Al2O3, CemZr1-mO2, LaMnAl11O19, BaMnAl11O19 or Sr12Al14O21 on the surface of the honeycomb ceramics of a dichroite material; wherein, m is equal to 0.1 to 0.8; the mass ratio of the honeycomb ceramics, the metal oxide coating and the catalytic activity components is 1.0 : 0.03 to 0.2 : 0.05 to 0.15. The invention also relates to a preparation method for the catalyst and the applications of the catalytic combustion thereof to eliminate the waste gases of volatile organic compound; the dichroite honeycomb ceramics carrier and the catalytic activity components of the prepared honeycomb ceramics perovskite catalytic combustion catalyst are combined by one metal oxide coating with high adhesiveness and thermal stability, thus leading the catalyst to have the advantages of high mechanical intensity, high activity and good thermal stability. The catalyst provided by the invention is simple in preparation method, is low in the price of the used materials, and has excellent industrial application prospect. La1-xSrxCoyMn1-yO3 (I).

Description

(1) Technical field [0001] The invention relates to a honeycomb ceramic type perovskite catalytic combustion catalyst and its preparation and catalytic combustion application, especially suitable for catalytic combustion to eliminate volatile organic compound waste gas. (2) Background technology [0002] Nowadays, benzene, toluene, xylene, ethyl acetate, Acetone, methanol, formaldehyde and other volatile organic compounds (Volatile organic compounds, referred to as VOCs) exhaust gas. The massive discharge of these harmful gases not only has a serious impact on the local ecological environment but also on the earth's environment, and is one of the causes of atmospheric photochemical smog, greenhouse effect and ozone layer destruction. At the same time, volatile organic waste gas is a pollutant that endangers human health. my country's new "Comprehensive Emission Standards of Air Pollutants" (GB 16297-1996) strictly limits the emission rate and concentration of VOCs such as ...

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Problems solved by technology

This method is simple to operate, uniformly loaded, and has high adhesion strength of active species. However, during the roasting process, the metal ions adsorbed on the surface of cordierite cannot form a complete perovskite crystal structure due to the interference of the carrier, and the catalyst activity is low.

Secondly, the surface metal ions are easy to interact with the carrier at high temperature, and the catalyst is easy to deactivate; (3) In order to make the crystal phase of the perovskite catalyst on the surface of honeycomb ceramics perfect, many researchers [Fabbrini L, Rossetti I, Forni L, Appl Catal B, 2003, 44: 107-116, Fabbrini L, Rossetti I, Forni L, Appl Catal B, 2006, 63: 131-136, Chinese patent CN1990103] proposed to prepare high structural integrity and high specific surface area of ​​perovskite catalyst powder, then add the catalyst powder into water to form a suspension, and load the perovskite powder catalyst on the surface of cordierite by dip-coating multiple times. Although this method maintains the The crystal phase and catalytic activity of perovskite catalysts, but in the actual reaction process, the thermal interaction between perovskite and cordierite support cannot be avoided

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