Medium and low temperature denitrification catalyst with Mn as active metal and Nd as assistant and preparation method of medium and low temperature denitrification catalyst

Abstract

The invention discloses a medium and low temperature denitrification catalyst with Mn as active metal and Nd as an assistant and a preparation method of the medium and low temperature denitrificationcatalyst. The catalyst is prepared with an ethanol dispersion method, zeolite molecular sieve SAPO-34 serves as a carrier, oxide of Mn serves as an active component and Nd serves as the assistant, thequality of the carrier is taken as the benchmark, the load of the active component manganese is 20%, and the mole ratio of neodymium to manganese is 0, 0.1, 0.2, 0.3, 0.4 respectively. Compared witha catalyst unloaded with the assistant, the SCR (selective catalytic reduction) catalyst has the advantages that dispersity of Mn can be improved by the aid of Nd, the active component can be protected, and denitration efficiency of the catalyst can be remarkably improved; when the mole ratio of Nd to Mn is 0.3, conversion rate of NO can reach more than 99% averagely within 140-220DEG C.

Description

technical field [0001] The invention belongs to the field of air pollution control technology and environmental protection catalytic materials, relates to SCR (Selective Catalytic Reduction) flue gas denitrification technology, in particular to a medium and low temperature denitrification catalyst with Mn as active metal and Nd as auxiliary agent and its preparation method . Background technique [0002] At present, the mainstream denitrification technology adopted by industrial boilers is based on NH 3 Selective Catalytic Reduction (SCR) as the reducing agent, most of which use V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 The main shortcomings of the series of traditional SCR catalysts are reflected in two aspects. One is that the operating temperature of the vanadium-based SCR denitration catalyst is above 350°C, resulting in short catalyst life and difficult engineering design. The other is that alkali metals, H 2 O, SO 2 The poisoning of other impurities makes the performance of ...

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Problems solved by technology

[0002] At present, the mainstream denitrification technology adopted by industrial boilers is based on NH 3 Selective Catalytic Reduction (SCR) as the reducing agent, most of which use V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 The main shortcomings of the series of traditional SCR catalysts are reflected in two aspects. One is that the operating temperature of the vanadium-based SCR denitration catalyst is above 350°C, resulting in short catalyst life and difficult engineering design. The other is that alkali metals, H 2 O, SO 2 The poisoning of impurities such as catalysts will greatly reduce the performance of the catalyst.

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