Catalysed filter system for treating particulate-containing exhaust gas from stationary emission sources
A catalytic filtration and emission source technology, applied in the direction of dispersed particle filtration, exhaust equipment, gas treatment, etc., can solve the problems of not so high mechanical strength, increase filter porosity, reduce filter mechanical strength, etc.
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Embodiment 1
[0083] Example 1 - Procedure for Candle Filter Insert Synthesis
[0084] While stirring, mix enough 3 The commercially available TiO 2 The powder was added to the water in the blender so that the final weight fraction of solids was 30%.
[0085] The resulting slurry was ball milled to reduce the particle size to d50<6 μm.
[0086] After grinding, the slurry was returned to the mixer.
[0087] Mix the vanadyl oxalate into the slurry. Add NH if necessary 3 To maintain the pH between 6.5-7.5, thereby controlling the rheological properties of the washcoat.
[0088] The silica sol was added to the slurry while mixing. The pH was again maintained between 6.5-7.5.
[0089] The resulting slurry (now referred to as washcoat) is diluted to the appropriate solids content for washcoating. Adjust pH as needed to maintain between 6.5-7.5
[0090] The washcoat is poured into a pan of sufficient size to allow the fiberglass mat to dip into it.
[0091] Dip the fiberglass mat into ...
Embodiment 2
[0096] Example 2 - Preparation of Oxidation Catalyst Catalyzed Glass Mats
[0097] The method is similar to that used in Example 1. Mix enough γ-Al 2 o 3 Added to water to achieve 50 wt% Al 2 o 3 solid concentration. The alumina slurry batch in water was transferred to a ball mill and ground to a particle size below 15 μm (D50 about 4 μm and D90 about 8 μm) while maintaining the pH 2 o 3 . Tetraaminoplatinum nitrate was added to the slurry. The pH was controlled at pH 6 using ammonium nitrate or acetic acid.
[0098] Dip a fiberglass mat into the resulting washcoat and place on a drying rack to drip dry.
[0099] The catalyzed glass fiber mat was dried in an oven at 80°C in air, followed by firing at 525°C to activate the catalyst.
Embodiment 3
[0100] Example 3 - Testing of SCR Catalyst Catalyzed Glass Fiber Mat Inserts in Candle Filters
[0101] A 9 inch by 25 inch section of the SCR catalytic glass fiber mat prepared according to Example 1 was rolled into a tube, ie a tube including a hollow portion therein, and one end was folded over itself to prevent gas bypass during the test. The rolled tube is then inserted into a bare uncatalyzed low alkali circular cross-section candle filter approximately 8 inches long, with the folded end of the tube inserted first so that the folded end is aligned with the closed end of the candle filter Apposition. At temperatures in the range of 250°C to 450°C, at Figure 6A In the Adapted Synthetic Catalytic Activity Test (SCAT) apparatus 10 shown, a candle filter comprising a fiber mat insert catalyzed by an SCR catalyst was tested for SCR activity. The candle filter 12 to be tested is mounted hermetically (using appropriate gaskets (not shown) and four equidistant nut and bolt f...
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Abstract
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