Bag-type NOx-removing catalyst and preparation method thereof
A catalyst and removal technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as reducing service life, achieve long service life, wide application range, and reduce treatment costs
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[0030] A kind of preparation method of bag type removal NOx catalyst comprises the steps:
[0031] 1) Preparation of catalyst powder: first prepare aqueous solutions of Mn salt, Ce salt and W salt in different molar ratios, the Mn salt and Ce salt are sulfate, acetate, nitrate or phosphate, and the W The salt is ammonium tungstate or ammonium metatungstate, and the molar ratio of the prepared Mn salt, Ce salt and W salt is 1~5:1~4:0~2. Next, weigh Co, Cu, Fe, Ni, La , Ti, Al, Si oxides or one or more of C are added to the active component solution as additives, stirred with a stirrer for 1~2h, and then dried in a blast drying oven at 60°C~120°C for 8~ 24h, then put it into a muffle furnace at 350°C~800°C and roast for 8~24h, after grinding, sieve through 120 mesh~200 mesh to obtain catalyst powder, wherein the mass percentage of active component is 5% based on the mass of the carrier ~50%, the mass percentage of additives is 0~50%
[0032] 2) Preparation of catalyst suspensi...
Embodiment 1
[0039] 1) Preparation of catalyst powder: Weigh 2.9g manganese acetate, 20.55g cerium nitrate, 0.9g ammonium tungstate to make Mn 2+ 、Ce 3+ , W 6+ The mixed solution with a molar ratio of 1:4:0.3 was stirred with a magnetic stirrer for 1 hour, then dried in a blast oven at 60°C for 24 hours, roasted in a muffle furnace at 350°C for 24 hours, ground in a mortar, and sieved through a 200-mesh sieve. Catalyst powder, wherein based on the mass of the carrier, the mass percentage of the active component is 50%, and the mass percentage of the auxiliary agent is 0%;
[0040] 2) Preparation of catalyst suspension solution: Weigh 5g of the powder prepared in step (1) into a container, add methanol to make a solution with a concentration of 3% by mass, put the solution into an ultrasonic instrument for 30 minutes of ultrasonic dispersion Prepare catalyst suspension solution;
[0041] 3) Catalyst powder loading: spread the PE filter bag on the suction filter funnel, evenly pour the susp...
Embodiment 2
[0043] 1) Preparation of catalyst powder: Weigh 5.85g manganese nitrate, 2.07g cerium acetate, 3.31g ammonium tungstate to make Mn 2+ 、Ce 3+ , W 6+ For a mixed solution with a molar ratio of 5:1:2, weigh 2g of titanium oxide additive and add it to the active component solution, stir it with a magnetic stirrer for 1.5h, then dry it in a blast oven at 80°C for 20h, and put it in a muffle furnace at 450°C Medium roasting 20h, mortar grinding, 180 order sieves and make catalyst powder, wherein take the quality of carrier as a benchmark, active component mass percent composition is 35%, and auxiliary agent mass percent composition is 10%;
[0044] 2) Preparation of catalyst suspension solution: Weigh 4.5g of the powder prepared in step (1) into a container, add deionized water to make a solution with a concentration of 4% by mass, put the solution into an ultrasonic instrument for 40min Prepare catalyst suspension solution after ultrasonic dispersion;
[0045] 3) Catalyst powder...
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