Thallium poisoning-resistant core-shell honeycomb catalyst for cement kiln flue gas denitrification and preparation method thereof
A technology of core-shell catalyst and core-shell honeycomb, which is applied in the field of denitrification catalyst, can solve the problems of short life, poor activity, and rapid reduction of denitrification efficiency, and achieve the effects of prolonging life, prolonging service life, improving denitrification efficiency and activity
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Embodiment 1
[0028] A method for preparing a cement kiln flue gas denitration and anti-thallium poisoning core-shell honeycomb catalyst, comprising the following steps:
[0029] 1) V-W / TiO with antithallium additive added 2 Preparation: Add 0.370kg of ammonium metavanadate, 1.25kg of ammonium metatungstate, and 0.36kg of gallium oxide into deionized water, stir and heat to dissolve, then add 18.36kg of commercial titanium dioxide powder, and continue stirring under ultrasonic conditions to obtain a slurry The material is injected into a spray dryer and dried at a drying temperature of 150°C to obtain a 2% Ga / V-W / TiO 2 powder;
[0030] 2) V-W / TiO 2 @Metal oxide core-shell catalyst preparation: take 2% Ga / V-W / TiO 2 Powder 2kg, ultrasonically dispersed in ethanol / water (v / v=1) mixed solution to obtain a suspension, then add 10kgPVP to the suspension and continue ultrasonic until the dispersion is uniform, then add 0.34kg of tetraethyl orthosilicate and 0.2kg of hexamethylenetetramine, aft...
Embodiment 2
[0033] A method for preparing a cement kiln flue gas denitration and anti-thallium poisoning core-shell honeycomb catalyst, comprising the following steps:
[0034] 1) V-W / TiO with antithallium additive added 2 Preparation: Add 0.30kg of ammonium metavanadate, 1.30kg of ammonium metatungstate, and 0.72kg of indium oxide into deionized water. After fully stirring and heating to dissolve, add 18kg of commercial titanium dioxide powder, and continue stirring under ultrasonic conditions to obtain a slurry , injected into a spray dryer and dried at a drying temperature of 300°C to obtain a 4% In / V-W / TiO 2 powder;
[0035] 2) Preparation of V-W / TiO2@metal oxide core-shell catalyst: take 4% In / V-W / TiO 2 Powder 1.96kg, ultrasonically dispersed in ethanol / water (v / v=3) mixed solution to obtain a suspension, then add 9.8kgPVP to the suspension and continue ultrasonic until uniformly dispersed, then add ammonium molybdate 0.18kg and 0.3kg of hexamethylenetetramine, after condensing an...
Embodiment 3
[0038]A method for preparing a cement kiln flue gas denitration and anti-thallium poisoning core-shell honeycomb catalyst, comprising the following steps:
[0039] 1) V-W / TiO with antithallium additive added 2 Preparation: Add 0.27kg of ammonium metavanadate, 1.35kg of ammonium metatungstate, and 0.6kg of gallium sulfate into deionized water. After fully stirring and heating to dissolve, add 20kg of commercial titanium dioxide powder, and continue stirring under ultrasonic conditions to obtain a slurry , injected into a spray dryer and dried at 200°C to obtain 3% Ga / V-W / TiO 2 powder;
[0040] 2) V-W / TiO 2 @Metal oxide core-shell catalyst preparation: take 3% Ga / V-W / TiO 2 Powder 1.98kg, ultrasonically dispersed in ethanol / water (v / v=2) mixed solution to obtain a suspension, then add 9.5kgPVP to the suspension and continue ultrasonic until uniformly dispersed, then add 0.31kg of zirconium acetate and 0.3 kg hexamethylenetetramine, after reflux, the product was cooled to room...
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