Hollow carbon sphere denitration catalyst capable of being used for low-temperature flue gas and preparation method of hollow carbon sphere denitration catalyst
A technology of denitrification catalyst and hollow carbon spheres, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of nitrous oxide and denitrification efficiency Unable to meet the demand and other problems, to achieve the effect of improving catalyst selectivity, improving catalytic reaction efficiency, and reducing the required time
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[0041] A method for preparing a hollow carbon sphere denitrification catalyst applicable to low-temperature flue gas, which is used to prepare the above-mentioned hollow carbon sphere denitrification catalyst applicable to low-temperature flue gas, and includes the following steps:
[0042] Step 1: Prepare hollow carbon spheres by template method;
[0043] Step 2: Oxidize the surface of the hollow carbon spheres with an oxidant solution; here the oxidant solution is 20mM-40mM potassium permanganate solution; the specific method is to disperse the hollow carbon spheres synthesized in step 1 in an aqueous solution of potassium permanganate and ultrasonically Treatment; in this way, potassium permanganate acts as an oxidizing agent and a reactant of a hydrothermal reaction, and also expands the weak points on the hollow carbon spheres into regular holes;
[0044] Step 3: Transfer the potassium permanganate aqueous solution in step 2 to a hydrothermal reaction kettle for reaction,...
Embodiment 1
[0057] First, mix 600mL 80% ethanol and 20mL ammonia water evenly, then add 25mL tetraethyl orthosilicate to the mixed solution, stir at room temperature for one hour, then add 4mL 40% formaldehyde solution and 3g resorcinol, stir overnight and then wash with suction to neutral, then transfer the material into a tube furnace and carbonize at 800 °C for 4 h under an argon atmosphere, after cooling to room temperature, wash the silicon-based template with 10% hydrofluoric acid, and wash it with deionized water until neutral That is, hollow carbon spheres are obtained.
[0058] Disperse the hollow carbon spheres obtained above in 80 mL of 0.1M acidic KMnO 4 In the solution, the mixed solution was ultrasonicated for 15 minutes, followed by hydrothermal synthesis at 150° C. for 10 hours, and then filtered and washed until neutral to obtain hollow carbon spheres loaded with manganese dioxide.
[0059] Dissolve 30 mmol of cobalt salt in 30 mL of 0.2 M dilute HNO 3 , then put the ho...
Embodiment 2
[0061] First, mix 800mL 75% ethanol and 30mL ammonia water evenly, then add 30mL tetraethyl orthosilicate to the mixed solution, stir at room temperature for one hour, then add 6mL 30% formaldehyde solution and 2.5g resorcinol, stir overnight and then filter with suction Wash until neutral, then transfer the material into a tube furnace and carbonize at 600 °C for 4 h under an argon atmosphere. After cooling to room temperature, wash off the silicon-based template with 8% hydrofluoric acid, and wash with deionized water until neutral. properties to obtain hollow carbon spheres.
[0062] Disperse the hollow carbon spheres obtained above in 60 mL of 0.2M acidic KMnO 4 In the solution, the mixed solution was ultrasonicated for 40 minutes, followed by hydrothermal synthesis at 180° C. for 6 hours, and then filtered and washed until neutral to obtain hollow carbon spheres loaded with manganese dioxide.
[0063] Dissolve 20 mmol of cobalt salt in 30 mL of deionized water, then put ...
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