Integral type combustion catalyst with multiple active centers

Abstract

The invention discloses an integral type combustion catalyst with multiple active centers. The integral type combustion catalyst is prepared from a carrier, an oxide active center loaded on the carrier, and a noble metal active center loaded on the carrier, wherein the carrier is cordierite honeycomb ceramic; the oxide active center is prepared from a rare earth metal oxide and a transitional metal oxide, and is a quaternary combined mixture of Cu, Mn, Ce and Zr oxides; the amount ratio of substances of Cu, Mn, Ce and Zr in the quaternary combined mixture of the Cu, Mn, Ce and Zr oxides is 1.0: (1.0 to 8.0): (1.0 to 8.0): (1.0 to 8.0); the loading capacity of the quaternary combined mixture is 1.0 to 6.0 weight percent; the noble metal active center is a mixture of noble metals Pt and Pd; the loading capacity of Pt is 0.005 to 0.1 weight percent, and the loading capacity of Pd is 0.005 to 0.1 weight percent. The integral type combustion catalyst with the multiple active centers, which is prepared by an immersion method, is applicable to catalytic combustion of all types of complex organic waste gas; different active centers have an extremely good synergistic effect, so that temperature of catalytic combustion of the organic waste gas is reduced, and the cost is low; the integral type combustion catalyst is suitable for industrialization.

Description

technical field [0001] The invention relates to the preparation of an integral catalyst with multiple active centers, in particular to the preparation and application of a high-efficiency organic waste gas combustion catalyst, and belongs to the field of air pollution control and treatment. Background technique [0002] Volatile organic waste gas (VOCs) has become one of the most important air pollutants, and it is one of the main causes of "smog", and it is urgent to effectively control its emission. Compared with many treatment technologies, catalytic combustion technology has the advantages of energy saving and high efficiency, and is widely used in various organic waste gas treatment projects. The core technology of catalytic combustion is catalyst, and the quality of the catalyst is the key to the whole exhaust gas purification and treatment project. [0003] At present, VOCs catalytic combustion catalysts are mainly divided into two categories: one is noble metal cata...

AI Technical Summary

Problems solved by technology

Among them, the "Pt metal active site" has the characteristics of high temperature resistance and long life, and it is not harmful to the product CO 2 It has high selectivity, and the complete oxidation reaction is relatively thorough, but its activity on various organic compounds is not high, and its ignition temperature is relatively high; while the "Pd metal active site" is effective on aromatic compounds (benzene, toluene and xylene etc.) has high activity and low ignition temperature, but its oxidation is relatively incomplete, and it is easy to generate oxidation intermediate products, causing secondary pollution

Copper-manganese oxide catalysts are more reported in composite oxide catalysts, such as Cu-Ce, Cu-Mn binary oxide catalysts (CN200710069527.X, J Hazardous Mater, 2009,169:758-765), Cu-Mn -Ce multi-component catalyst (CN201010299551.4, CN201110444747.2), perovskite oxide catalyst (CN201310721656.8, CN200910102190.7, CN200910101478.2), the active site of this type of oxide catalyst is metal oxygen bond "M-O", Among them, the active oxygen combined with the metal can directly participate in the reaction, the oxidation reaction is complete, and the CO 2 The selectivity is extremely high, and the ignition temperature for oxygen-containing organic molecules is 30-100 degrees lower than that of noble metals, but its thermal stability is poor, and its activity for aromatic organic compounds is not high

[0004] In the actual waste gas treatment project, the exhaust gas is often complex waste gas containing various organic molecules. We found that commercial catalysts have their own advantages and disadvantages, and the oxidation activity of organic compounds is inconsistent. 2 There are also differences in selectivity, so the use of a single noble metal or composite oxide catalyst cannot purify all organic molecules, resulting in the impact of catalytic combustion exhaust gas purification rate indicators

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