Preparation and application method of Ce-Zr/molecular sieve Fenton heterogeneous catalyst
A technology of heterogeneous catalyst and application method, which is applied in the preparation and application field of Ce-Zr/molecular sieve Fenton heterogeneous catalyst, can solve the problem of large dosage of chemicals, large sludge, and increase the operation of high-salt and high-COD wastewater treatment equipment Cost and other issues, to achieve the effect of low production cost, easy access, good catalytic activity
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[0034] Catalyst preparation steps:
[0035] S1, weigh Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·5H 2 O, under the condition of 40-80 ℃ strong stirring for 10-30 min, dissolve in a certain amount of deionized water to prepare cerium nitrate and zirconium nitrate solution, control the content of cerium nitrate and zirconium nitrate at 0.3%wt-8.0%wt, The molar ratio of Ce to Zr is controlled between (3:1)-(1:5);
[0036] S2. Weigh the purchased molecular sieve raw material with a mass of m3, wash it with deionized water and ethanol alternately with ultrasonic oscillation for 10-60 min at room temperature, and dry the cleaned molecular sieve carrier at 80-120°C for 4-12 h. Take it out for later use, and control the content of active components Ce and Zr at 0.05%wt-2.0%wt;
[0037] S3, slowly add the cerium nitrate and zirconium nitrate solution into the molecular sieve carrier, place it in an ultrasonic oscillation device, shake and impregnate it for 10-120 minutes, and dry the sha...
Embodiment 1
[0039] (1) Weigh 4.328g of Ce(NO 3 ) 3 ·6H 2 O, weigh 4.025g of Zr(NO 3 ) 4 ·5H 2 O, dissolved in 200 mL of deionized water, stirred and dissolved in a water bath at 60°C for 20 min, and prepared as a mixed active solution with cerium nitrate and zirconium nitrate content of about 3.18%;
[0040](2) Weigh 300 g of purchased molecular sieves, wash them with 500 mL of deionized water and 500 mL of ethanol with alternating ultrasonic vibrations for 30 min at room temperature, and dry the cleaned molecular sieves in a drying oven at 90 °C for 8 h. Weigh 200.126g of molecular sieve and place it in a crucible, and slowly add active solutions of cerium nitrate and zirconium nitrate to the crucible filled with molecular sieves step by step, the content of active components Ce and Zr is about 1.11%wt;
[0041] (3) Place the crucible containing the molecular sieve and the active solution in an ultrasonic oscillation device, oscillate and impregnate for 60 min, place the catalyst af...
Embodiment 2
[0043] (1) Weigh 2.167g of Ce(NO 3 ) 3 ·6H 2 O, weigh 4.019g of Zr(NO 3 ) 4 ·5H 2 O, dissolved in 200 mL of deionized water, placed in a water bath at 70°C and stirred for 25 min to form a mixed active solution with cerium nitrate and zirconium nitrate content of about 2.35%;
[0044] (2) Weigh 300 g of purchased molecular sieves, wash them with 500 mL of deionized water and 500 mL of ethanol by alternating ultrasonic oscillation for 30 min at room temperature, and dry the cleaned molecular sieves in a drying oven at 100 °C for 7 h. Weigh 200.008g of molecular sieve and place it in a crucible, and slowly add active solutions of cerium nitrate and zirconium nitrate into the crucible filled with molecular sieves step by step, the content of active components Ce and Zr is about 0.77%wt;
[0045] (3) Place the crucible containing the molecular sieve and the active solution in an ultrasonic oscillation device, oscillate and impregnate for 50 min, place the catalyst after ultra...
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