Catalyst for selectively reducing NOx by ammonia with high thermal stability and preparation method thereof
A technology for nitrogen oxides and catalysts, applied in the field of environmental pollution control, can solve the problems of reducing the activity of catalysts for selective reduction of nitrogen oxides by ammonia, flue gas and diesel vehicle exhaust temperature fluctuations, poor thermal stability of catalysts, etc. Chemical application prospect, good anti-sulfur and water resistance, good low temperature activity effect
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Embodiment 1
[0021] A preparation method of the described low-temperature ammonia selective catalytic reduction nitrogen oxide catalyst for denitrification of flue gas or removal of nitrogen oxides in motor vehicle exhaust gas, comprising the following steps:
[0022] Weigh 9g Sm(NO 3 ) 3 ·6H 2 O, 30g MnSO 4 and 2.4gTi 2 (SO 4 ) 3 Dissolved in deionized water to make a mixed solution, the Sm / Mn / Ti metal molar ratio is 0.1 / 1 / 0.05. Preset 100mL deionized water in the beaker, slowly add 0.2M Na 2 CO 3 solution until the pH value of the aqueous solution is 11, then drop the mixed metal salt solution and 0.2M Na into the beaker at the same time 2 CO 3 Solution, control the rate of addition of the two, so that the pH value of the solution remains at 11. After the dropwise addition, the resulting mixture was stirred at room temperature for 24 hours, then suction filtered and washed until the filtrate was neutral, and the obtained filter cake was dried in an oven at 110°C, and finally ro...
Embodiment 2
[0026] A preparation method of the described low-temperature ammonia selective catalytic reduction nitrogen oxide catalyst for denitrification of flue gas or removal of nitrogen oxides in motor vehicle exhaust gas, comprising the following steps:
[0027] Weigh 9g Sm(NO 3 ) 3 ·6H 2 O, 30g MnSO 4 and 14.4g Ti 2 (SO 4 ) 3 Dissolved in deionized water to make a mixed solution, the Sm / Mn / Ti metal molar ratio is 0.1 / 1 / 0.3. Preset 100mL deionized water in the beaker, slowly add 0.2M Na 2 CO 3 solution until the pH value of the aqueous solution is 11, then drop the mixed metal salt solution and 0.2M Na into the beaker at the same time 2 CO 3 Solution, control the rate of addition of the two, so that the pH value of the solution remains at 11. After the dropwise addition, the resulting mixture was stirred at room temperature for 24 hours, then suction filtered and washed until the filtrate was neutral, and the obtained filter cake was dried in an oven at 110°C, and finally r...
Embodiment 3
[0030] A preparation method of the described low-temperature ammonia selective catalytic reduction nitrogen oxide catalyst for denitrification of flue gas or removal of nitrogen oxides in motor vehicle exhaust gas, comprising the following steps:
[0031] Weigh 9g Sm(NO 3 ) 3 ·6H 2 O, 30g MnSO 4 and 33.6g Ti 2 (SO 4 ) 3 Dissolved in deionized water to make a mixed solution, the Sm / Mn / Ti metal molar ratio is 0.1 / 1 / 0.7. Preset 100mL deionized water in the beaker, slowly add 0.2M Na 2 CO 3 solution until the pH value of the aqueous solution is 11, then drop the mixed metal salt solution and 0.2M Na into the beaker at the same time 2 CO 3 Solution, control the rate of addition of the two, so that the pH value of the solution remains at 11. After the dropwise addition, the resulting mixture was stirred at room temperature for 24 hours, then suction filtered and washed until the filtrate was neutral, and the obtained filter cake was dried in an oven at 110°C, and finally r...
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