Strip manganese-base catalyst for low-temperature denitration of fixing source and preparation method for strip manganese-base catalyst

Abstract

The invention discloses a strip manganese-base catalyst for the low-temperature denitration of a fixing source. According to the strip manganese-base catalyst, a mixed oxide of Mn and Fe is used as an active component, and anatase TiO2 is used as a carrier; a mass ratio of Mn to Fe to TiO2 in the catalyst is (0.5-1.5):(0.5-1.5):10; and the catalyst is a strip of which the diameter of the cross section is 3 to 5 millimeters. In addition, the invention also discloses a method for preparing the strip manganese-base catalyst. According to the method, toxic components V2O5 are not used, so the strip manganese-base catalyst is safe and non-toxic and has high tolerance on high-content H2O (which is 10 volume percent), and the conversion rate of NO is more than 97 percent at the temperature of 230 DEG C; and the strip manganese-base catalyst has high stability in the 150-hour continuous evaluation process, and the conversion rate of NO can be maintained at about 95 percent.

Description

technical field [0001] The invention belongs to the technical field of preparation of low-temperature denitrification catalysts, and in particular relates to a bar-shaped manganese-based catalyst for low-temperature denitrification of fixed sources and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, which can cause acid rain, photochemical smog and ozone depletion, and can also participate in the formation of inhalable particulate matter (PM2.5) in the air. Common nitrogen oxides include N 2 O, NO, N 2 o 3 , NO 2 and N 2 o 5 etc. Among them, NO and NO 2 . [0003] Known 90% NO x Emissions come from fuel combustion, and their sources can be divided into stationary and mobile sources. Stationary sources mainly refer to the combustion flue gas of thermal power plants and industrial boilers, which are NO x The main source of emissions; mobile sources are mainly motor vehicle exhaust emissions. Wit...

AI Technical Summary

Problems solved by technology

However, there are also some problems in practical application of this type of catalyst: First, the optimum catalyst activity temperature is above 350°C, so the catalyst bed must be installed before the desulfurization and dust removal device, and the high concentration of SO in the flue gas 2 and fly ash are easy to poison and block the catalyst, resulting in increased operating costs; and higher operating temperatures are also likely to cause NH 3 Partially oxidized to N 2 O and NO; in addition, the active component V has strong biological toxicity and can have a cumulative effect in the organism, which is easy to damage human health and destroy the ecological environment during the production and use of the catalyst

However, no matter the existing manganese-based catalyst is a single manganese oxide (MnO x ), or supported manganese oxides (such as MnO x / TiO 2 , MnOx / Al 2 o 3 , MnO x / Activated carbon, MnO x / SiO 2 etc.) and manganese-based composite oxides (such as MnO x -FeO x , MnO x -FeO x / TiO 2 , MnO x -CuO, MnO x -CeO 2 etc.), most of them have anti-H 2 O and SO 2 The problem of poor performance has become the biggest obstacle to the industrial application of this type of catalyst, and its preparation and molding methods are rarely reported.