Method for enhancing catalytic performance of cerium-base denitrification catalyst and application thereof
A technology of denitration catalyst and catalytic performance, applied in the field of denitration catalyst, can solve the problems of high cost of denitration catalyst, industrial scale-up, difficult production, etc., and achieve the effects of improving redox performance, improving surface acidity, and promoting adsorption and activation.
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Embodiment 1
[0032] 1. CeO 2 preparation of
[0033] Accurately weigh 75.6890g of Ce(NO 3 ) 3 ·6H 2 O, after grinding in an agate mortar for 60 min, place it in a ceramic crucible, then put the ceramic crucible into a muffle furnace, and raise the temperature from room temperature to 500 °C at a rate of 2 °C / min under 100 mL / min flowing air atmosphere, Keep the temperature for 5 hours, then take it out after natural cooling to room temperature, and grind it in an agate mortar for 60 minutes to prepare CeO 2 . Its XRD, H 2 -TPR, NH 3 -TPD and NH 3 -SCR reaction results are attached Figure 1-4 .
[0034] 2. CH 3 COOH(HAc) pretreatment CeO 2 (abbreviated as CeO 2 -Ac catalyst)
[0035] Accurately weigh 5.0000g of CeO 2 , and accurately measure 1.44ml of HAc (ie 25mmol HAc). Dilute the above HAc to 50ml with ultrapure water, and then add the weighed CeO 2 Immersed in diluted HAc solution. Stir magnetically for 3 hours until the mixture is uniform, then evaporate to dryness in ...
Embodiment 2
[0055] Accurately weigh 5 parts of 5.0000g CeO 2 , and accurately measure 28.8 μl of HAc (ie 0.5 mmol), 32.6 μl of concentrated HNO 3 (ie 0.5mmol), 40.4μl concentrated HCl (ie 0.5mmol), 30.8μl H 3 PO 4 (ie 0.5mmol) and 27.2μl concentrated H 2 SO 4 (ie 0.5 mmol). The above HAc, concentrated HNO 3 , concentrated HCl, H 3 PO 4 and concentrated H 2 SO 4 Dilute to 50ml respectively, then weigh the CeO 2 Immersed in diluted HAc, HNO 3 , HCl, H 3 PO 4 and H 2 SO 4 in solution. Stir magnetically for 3 hours until the mixture is evenly mixed, then evaporate to dryness in an oil bath at 80°C, dry overnight in a blast drying oven at 80°C, and grind evenly. After loading into a quartz boat, place it in a tube furnace, and in a static air atmosphere, raise the temperature from room temperature to 300-500°C at a rate of 10°C / min and keep the temperature constant for 5h. After natural cooling to room temperature, take it out and grind it evenly again to get HAc and HNO 3 , ...
Embodiment 3
[0057] Accurately weigh 5 parts of 5.0000g CeO2 , and accurately measure 14.4ml of HAc (ie 250mmol), 16.3ml of concentrated HNO 3 (i.e. 250mmol), 20.2ml concentrated HCl (i.e. 250mmol), 15.4ml of HCl 3 PO 4 (i.e. 250mmol) and 13.6ml concentrated H 2 SO 4 (ie 250mmol). The above HAc, concentrated HNO 3 , concentrated HCl, H 3 PO 4 and concentrated H 2 SO 4 Dilute to 50ml respectively, then weigh the CeO 2 Immersed in diluted HAc, HNO 3 , HCl, H 3 PO 4 and H 2 SO 4 in solution. Stir magnetically for 3 hours until the mixture is evenly mixed, then evaporate to dryness in an oil bath at 80°C, dry overnight in a blast drying oven at 80°C, and grind evenly. After loading into a quartz boat, place it in a tube furnace, and in a static air atmosphere, raise the temperature from room temperature to 300-500°C at a rate of 10°C / min and keep the temperature constant for 5h. After natural cooling to room temperature, take it out and grind it evenly again to get HAc and HNO ...
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