Preparing method of silver-based sepiolite oxynitride catalytic reduction catalyst
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A technology of nitrogen oxides and sepiolite, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., to achieve the effects of enhanced conversion capacity, wide working temperature window, and high activity
Inactive Publication Date: 2015-03-11
XIAN HUALU ENVIRONMENTAL PROTECTION EQUIP
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[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
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Embodiment 1
[0017] Dissolve the original sepiolite ore with water to remove calcite, silt and other sundries. The sepiolite suspension is allowed to stand for 24 hours. After a stable sediment layer appears, take the upper suspension, filter it with suction, and wash it with distilled water for 3 times. Dry to obtain pretreated sepiolite.
[0018] Then add 1.5mol / L hydrochloric acid solution to the pretreated sepiolite, soak at room temperature, stir for 72 hours, filter with suction, wash until no chloride ion can be detected, dry the obtained sample at 80°C for 24h, and then dry it at 250°C Under roasting for 4 hours, acid-modified sepiolite was obtained.
[0019] The modified sepiolite was impregnated in AgNO 3 solution, AgNO 3 The amount of solution used is that the mass ratio of silver ions to modified sepiolite is 2:98. Stir vigorously at room temperature for 4 hours, dry in a water bath at 75°C, press into tablets, crush and sieve, take 20 to 40 mesh powder, and move it into a mu...
Embodiment 2
[0021] Embodiment two: performance test experiment
[0022] Catalyst activity evaluation was carried out in a conventional flow microreactor, and the feed composition was NO: 0.1%, CO: 0.1%, O2: 5%, N 2 As a balance gas, of which NO, NO 2 Using an online chemical fluorescence analyzer to analyze, the space velocity is 16000h-1, the catalyst dosage is 1mL, and the NO X The conversion rate is a measure of catalyst activity. The test results are shown in Table-1.
[0023] Table-1 Test Results
[0024] .
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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...
Claims
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