Preparing method of silver-based sepiolite oxynitride catalytic reduction catalyst

Abstract

The invention relates to a preparing method of a silver-based sepiolite oxynitride catalytic reduction catalyst, and belongs to the field of environmental protection material preparation. The preparing method of the silver-based sepiolite oxynitride catalytic reduction catalyst comprises the following steps: adding 1.5 mol / L of a hydrochloric acid solution into sepiolite, soaking at the room temperature, stirring for 72 h, carrying out suction filtration, washing until no chloride ion is detected, drying the obtained sample for 24 h at the temperature of 80 DEG C, roasting for 4 h at the temperature of 250 DEG C, and thus obtaining acid-modified sepiolite; and vacuumizing the modified sepiolite, then impregnating with a certain amount of an AgNO3 solution, vigorously stirring for 4 h at the room temperature, drying with a 75 DEG C water bath, tabletting, crushing and sieving, taking a 20-40 mesh powder, transferring into a Muffle furnace, firing for 4 h, and thus obtaining the silver-based sepiolite oxynitride catalytic reduction catalyst. The process is simple; the prepared silver-based sepiolite oxynitride catalytic reduction catalyst has the characteristics of higher activity, wide working temperature window, heat and humidity resistance stability and the like, and the oxynitride conversion rate reaches a maximum value of 81.0% when the catalytic temperature rises to 320 DEG C.

Description

technical field [0001] The invention relates to a preparation method of a silver-based sepiolite nitrogen oxide catalytic reduction catalyst, belonging to the field of preparation methods of environmental protection material preparations. Background technique [0002] NO in Oxygenated Exhaust Gases from Thermal Power Plants and Lean-burn Locomotives X The selective catalytic reduction of selective catalytic reduction is a topic that has received more attention in the field of environmental catalysis. The supported metal ion exchange zeolite catalyst has been widely concerned. However, catalysts with better performance under actual conditions still need to be developed. Now it has been reported that zeolite or Al 2 o 3 The supported silver-based catalyst has a better working efficiency than other catalysts, therefore, the silver-based catalyst can selectively reduce NO under practical conditions X It is very promising. [0003] Sepiolite is a porous magnesia silicate with...

AI Technical Summary

Problems solved by technology

[0002] NO in Oxygenated Exhaust Gases from Thermal Power Plants and Lean-burn Locomotives X The selective catalytic reduction of selective catalytic reduction is a topic that has received more attention in the field of environmental catalysis. The supported metal ion exchange zeolite catalyst has been widely concerned. However, catalysts with better performance under actual conditions still need to be developed. Now it has been reported that zeolite or al 2 o 3 The supported silver-based catalyst has a better working efficiency than other catalysts, therefore, the silver-based catalyst can selectively reduce NO under practical conditions X is very promising