Introduction to low-temperature SCR denitrification catalysts
Publishdate：2018-06-07 Views：16
Nitrogen oxides (NO, NO2, N2O) are the main sources of air pollution, producing photochemical smog, acid rain, ozone holes, and greenhouse effects. Almost all NOx comes from transportation and thermal power plants. Therefore, controlling the emission of NOx in the air is an urgent problem to be solved. Low NOx combustion technology is mostly used in coal-fired power plants in China, while selective catalytic reduction (SCR) technology with higher denitrification efficiency is relatively less applied, and SCR denitrification technology is widely used abroad. The core of SCR denitrification technology is catalytic reactions, and the successful development of catalysts for catalytic reactions is crucial.
The successful commercial application of SCR denitration catalysts mainly involves a mixture of vanadium titanium based (V2O5/TiO2) and WO3 or MoO3. Although vanadium based catalysts have high activity and resistance to SO2, they still have many drawbacks. This catalyst is active in a narrow temperature range of 300-400 ℃, which can avoid pore blockage caused by ammonium sulfate salts such as NH4HSO4 and (NH4) 2S2O7. This high-temperature SCR denitrification device is installed after the economizer, before the air preheater and desulfurization device. Due to the lack of dust removal treatment for the flue gas, it is easy to cause catalyst pore blockage, which affects the lifespan of the catalyst. Low temperature SCR catalysts can be placed after desulfurization with low energy consumption, which can reduce energy consumption, prevent catalyst pore blockage, and improve catalyst life. Therefore, in recent years, the development of low-temperature, efficient, and stable SCR denitrification catalysts has become a hot research topic for scholars.
In recent years, mixtures of one or several metal oxides as active components of catalysts have attracted widespread attention due to their excellent low-temperature catalytic activity, among which Mn based catalysts have particularly outstanding low-temperature activity. There have been many studies on Mn oxides, and Ce based Fe based low-temperature catalysts have also been reported. These catalysts have good low-temperature activity, but a common weakness is their poor sulfur resistance, which seriously restricts the commercialization of low-temperature catalysts.
Beijing Fangxin Lihua Technology Co., Ltd. is a subsidiary of Tongxing Environmental Protection Technology Co., Ltd. It is a technology-based environmental protection enterprise dedicated to atmospheric governance. It is a high-tech environmental protection enterprise with independent intellectual property rights in the production, sales, denitrification engineering, and technology research and development of low-temperature SCR denitrification catalysts in China. At present, "Fangxin" low-temperature SCR denitrification catalyst has been subdivided into personalized formulas suitable for different industries and domains, and special specifications of catalyst products can be customized according to customer requirements to solve the problem of low-temperature treatment of NOx under sulfur-containing conditions.
Nitrogen oxides (NO, NO2, N2O) are the main sources of air pollution, producing photochemical smog, acid rain, ozone holes, and greenhouse effects. Almost all NOx comes from transportation and thermal power plants. Therefore, controlling the emission of NOx in the air is an urgent problem to be solved. Low NOx combustion technology is mostly used in coal-fired power plants in China, while selective catalytic reduction (SCR) technology with higher denitrification efficiency is relatively less applied, and SCR denitrification technology is widely used abroad. The core of SCR denitrification technology is catalytic reactions, and the successful development of catalysts for catalytic reactions is crucial.
The successful commercial application of SCR denitration catalysts mainly involves a mixture of vanadium titanium based (V2O5/TiO2) and WO3 or MoO3. Although vanadium based catalysts have high activity and resistance to SO2, they still have many drawbacks. This catalyst is active in a narrow temperature range of 300-400 ℃, which can avoid pore blockage caused by ammonium sulfate salts such as NH4HSO4 and (NH4) 2S2O7. This high-temperature SCR denitrification device is installed after the economizer, before the air preheater and desulfurization device. Due to the lack of dust removal treatment for the flue gas, it is easy to cause catalyst pore blockage, which affects the lifespan of the catalyst. Low temperature SCR catalysts can be placed after desulfurization with low energy consumption, which can reduce energy consumption, prevent catalyst pore blockage, and improve catalyst life. Therefore, in recent years, the development of low-temperature, efficient, and stable SCR denitrification catalysts has become a hot research topic for scholars.
In recent years, mixtures of one or several metal oxides as active components of catalysts have attracted widespread attention due to their excellent low-temperature catalytic activity, among which Mn based catalysts have particularly outstanding low-temperature activity. There have been many studies on Mn oxides, and Ce based Fe based low-temperature catalysts have also been reported. These catalysts have good low-temperature activity, but a common weakness is their poor sulfur resistance, which seriously restricts the commercialization of low-temperature catalysts.
Beijing Fangxin Lihua Technology Co., Ltd. is a subsidiary of Tongxing Environmental Protection Technology Co., Ltd. It is a technology-based environmental protection enterprise dedicated to atmospheric governance. It is a high-tech environmental protection enterprise with independent intellectual property rights in the production, sales, denitrification engineering, and technology research and development of low-temperature SCR denitrification catalysts in China. At present, "Fangxin" low-temperature SCR denitrification catalyst has been subdivided into personalized formulas suitable for different industries and domains, and special specifications of catalyst products can be customized according to customer requirements to solve the problem of low-temperature treatment of NOx under sulfur-containing conditions.
