Method for reducing nitrogen oxide in double bed combined catalyst system under enriched oxygen condition
A technology combining catalysts and nitrogen oxides, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as poor selectivity, narrow active temperature range, and poor hydrothermal stability.
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Embodiment 1
[0020] ①Pt / Al 2 o 3 Catalyst preparation:
[0021] 1) First prepare the H containing precious metal Pt of 4.45g / L 2 PtCl 6 weak;
[0022] 2) Take 40g of aluminum isopropoxide (AIP) and grind it into powder in a mortar; in a 1000mL rotary evaporating flask, heat 300mL of deionized water to 80°C, then add aluminum isopropoxide, and heat and stir for 1 hour;
[0023] 3) Take 65% concentrated HNO 3 3mL was added to 20mLH 2 O, stir well, put HNO 3 Add the solution dropwise to the mixed solution, and continue heating and stirring in the rotary evaporator for 1 hour to form a transparent boehmite sol;
[0024] 4) Add 22.5mL of noble metal Pt containing 4.45g / L H 2 PtCl 6 Ethanol solution, continue heating and stirring in the rotary evaporator for 1 hour;
[0025] 5) Evaporate under reduced pressure in a rotary evaporator at 85°C for 4 hours, then place it for 12 hours to age to form a gel, and dry it in an oven at 100°C for 12 hours;
[0026] 6) Sintering at 500°C for 5 ho...
Embodiment 2
[0036] ①Pt / Al 2 o 3 Catalyst preparation
[0037] 1) Take 40g of aluminum isopropoxide and grind it into powder in a mortar;
[0038] 2) Add 300mL deionized water to a 1000mL rotary evaporating flask and heat to 90°C;
[0039] 3) adding aluminum isopropoxide, heating and stirring for 3 hours;
[0040] 4) Take 65% concentrated HNO 3 3mL was added to 20mLH 2 O, stir well, put HNO 3 The solution was added dropwise to the mixed solution (dropwise), and continued to heat and stir in a rotary evaporator for 3 hours to form a transparent boehmite sol;
[0041] 5) Add 45mL of noble metal Pt containing 4.45g / L H 2 PtCl 6 Ethanol solution, continue heating and stirring in rotary evaporator for 4 hours;
[0042] 6) Use a circulating vacuum water pump to evacuate to 0.04-0.08MPa, heat and evaporate in a rotary evaporator at 90°C for 8 hours;
[0043] 7) Take out the above sol, place it for 24 hours, make it age to form a gel, and dry it in an oven at 120°C for 24 hours;
[0044...
Embodiment 3
[0053] ①Pt-Al 2 o 3 The preparation of catalyst is the same as in Example 2.
[0054] ②1% La 2 o 3 -5%SnO 2 -Al 2 o 3 Metal Oxide Catalyst Preparation
[0055] 1) Take 40g of aluminum isopropoxide and grind it into powder in a mortar;
[0056] 2) Add 300mL deionized water to a 1000mL rotary evaporating flask and heat to 90°C;
[0057] 3) adding aluminum isopropoxide, heating and stirring for 1 hour;
[0058] 4) Take 65% concentrated HNO 3 3mL was added to 20mLH 2 O, stir well, put HNO 3 The solution was added dropwise to the mixed solution (dropwise), and continued to heat and stir in a rotary evaporator for 1 hour;
[0059] 5) Prepare SnCl containing Sn50g / L 4 ·5H 2 O ethylene glycol solution and La(NO 3 ) 3 Ethylene glycol solution, respectively pipette 10.5mL of SnCl 4 ·5H 2 O ethylene glycol solution and 10 mL of La(NO 3 ) 3 Ethylene glycol solution was added dropwise, followed by heating and stirring in a rotary evaporator for 3 hours;
[0060] 6) Use...
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