Preparation method of porous coated iron-based molecular sieve catalyst
A molecular sieve and coating technology, which is applied in the field of preparation of porous coated iron-based molecular sieve catalysts, achieves the effects of good anti-sulfur effect, good high-temperature NOx conversion rate, and strong practical application value
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Embodiment 1
[0016] (1) Dissolve 1200g of ferric nitrate in deionized water, stir to dissolve, add 3000g Beta40 molecular sieve carrier, mix and stir for 2h; (2) Add 140g of ammonium carbamate and stir for 3h at 45℃ to obtain a mixed solution; (3) Mixed solution After drying at 90°C, calcining at 530°C for 4h, and grinding to obtain Fe modified molecular sieve powder; (4) Dissolve 2400g of lanthanum acetate in 3600g of deionized water to prepare a solution, then add 165g of ammonium formate and 2400g of 1% mass fraction CMC and 195g ethanol, stirred vigorously at 45°C for 5h; (5) Add 3000g of the Fe-modified molecular sieve powder obtained in (3) and stir vigorously at 65°C for 3h to obtain a paste; (6) Put the paste in Drying in an oven at 85°C, crushing, calcining at 480°C for 6 hours, and grinding to obtain a porous coated iron-based molecular sieve catalyst.
[0017] figure 1 For the TEM image of the catalyst prepared in Example 1, it can be seen that the outer layer of pores is relativel...
Embodiment 2
[0024] (1) Dissolve 3000g of ferric nitrate in deionized water, stir to dissolve, add 3000g of Sapo34 molecular sieve carrier, mix and stir for 4h; (2) Add 213g of ammonium carbamate and stir for 2h at 60℃ to obtain a mixed solution; (3) Mixed solution After drying at 110°C, calcining at 580°C for 4 hours, and grinding to obtain Fe modified molecular sieve powder; (4) Dissolve 3,600g of cerium acetate in 4800g of deionized water to prepare a solution, then add 375g of formamide, 3000g with a mass fraction of 1% CMC and 510g propanol, stirred vigorously at 105°C for 6h; (5) Add 3000g of the Fe-modified molecular sieve powder obtained in (3), and stir vigorously at 105°C for 5h to obtain a paste; (6) Combine the paste Drying in an oven at 105°C, crushing, calcining at 550°C for 4 hours, and grinding to obtain a porous coated iron-based molecular sieve catalyst.
Embodiment 3
[0026] (1) Dissolve 2500g of ferric nitrate in deionized water, stir to dissolve, add 3000g of ZSM5 molecular sieve carrier, and mix and stir for 4h; (2) Add 185g of ammonium carbamate and stir for 1h at 60℃ to obtain a mixed solution; (3) Mixed solution After drying at 105°C, calcining at 550°C, and grinding, the Fe modified molecular sieve powder is obtained; (4) Dissolve 2500g of manganese acetate in 4500g of deionized water to prepare a solution, then add 305g of ammonium oxalate, 2500g of 1.0% CMC mass fraction And 462g of absolute ethanol, stirred vigorously at 85°C for 2h; (5) Add 3000g of the Fe-modified molecular sieve powder obtained in (3), and stir vigorously at 105°C for 3h to obtain a paste; (6) add the paste Drying in an oven at 120°C, crushing, calcining at 530°C for 4 hours, and grinding to obtain a porous coated iron-based molecular sieve catalyst.
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