Preparation method for SCR catalyst for purifying oxynitride in motor vehicle exhaust
A technology of SCR catalyst and nitrogen oxides, which is applied in the field of preparation of molecular sieve catalysts, can solve the problems that are not conducive to the industrial production and large-scale application of Cu-SSZ-13, increase the cost of SSZ-13, and complicate the process of active components, etc., and achieve Good prospects for industrial application, excellent catalytic activity, and the effect of shortening the crystallization time
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Embodiment 1
[0025] 1) Preparation of SSZ-13 molecular sieve:
[0026] Dissolve 163.2g of sodium hydroxide in 10.26L of deionized water, stir to dissolve it completely, and then 380.4g of USY molecular sieve (CBV-720, silicon aluminum ratio SiO 2 / Al 2 o 3 =30) Add the above-mentioned sodium hydroxide solution as silicon source and aluminum source, continue stirring until uniform, then add 10 wt% SSZ-13 seed crystals relative to USY molecular sieve, continue stirring for 1-3h, then transfer the obtained gel into In a polytetrafluoroethylene-lined stainless steel reactor, crystallize at 150°C for 40 hours, cool to room temperature after the reaction is completed, filter the product and wash it with deionized water, dry it at 100°C for more than 12 hours, and exchange it with ammonium nitrate And calcined at 550°C for 8 hours to obtain hydrogen-type SSZ-13 molecular sieve.
[0027] The above-mentioned ammonium nitrate exchange process is as follows: prepare 500ml of 0.1mol / L ammonium nitr...
Embodiment 2
[0035] 1) Preparation of SSZ-13 molecular sieve:
[0036] Dissolve 163.2g of sodium hydroxide in 10.26L of deionized water, stir to dissolve it completely, and then 380.4g of USY molecular sieve (CBV-720, silicon aluminum ratio SiO 2 / Al 2 o 3 =30) Add the above-mentioned sodium hydroxide solution as silicon source and aluminum source, continue stirring until uniform, then add 10 wt% SSZ-13 seed crystals relative to USY molecular sieve, continue stirring for 1-3h, then transfer the obtained gel into In a polytetrafluoroethylene-lined stainless steel reaction kettle, crystallize at 140°C for 50 hours, cool to room temperature after the reaction is completed, filter the product, wash it with deionized water, dry it at 100°C for more than 12 hours, and exchange it with ammonium nitrate And calcined at 550° C. for 8 hours to obtain a hydrogen-type SSZ-13 molecular sieve, wherein the exchange of ammonium nitrate is the same as in Example 1.
[0037] 2) Preparation of Cu-SSZ-13 m...
Embodiment 3
[0044] 1) Preparation of SSZ-13 molecular sieve:
[0045] Dissolve 163.2g of sodium hydroxide in 10.26L of deionized water, stir to dissolve it completely, and then 380.4g of USY molecular sieve (CBV-720, silicon aluminum ratio SiO 2 / Al 2 o 3 =30) Add the above-mentioned sodium hydroxide solution as silicon source and aluminum source, continue stirring until uniform, then add 10 wt% SSZ-13 seed crystals relative to USY molecular sieve, continue stirring for 1-3h, then transfer the obtained gel into In a polytetrafluoroethylene-lined stainless steel reactor, crystallize at 150°C for 50 hours, cool to room temperature after the reaction is completed, filter the product and wash it with deionized water, dry it at 100°C for more than 12 hours, and exchange it with ammonium nitrate And calcined at 550° C. for 8 hours to obtain a hydrogen-type SSZ-13 molecular sieve, wherein the exchange of ammonium nitrate is the same as in Example 1.
[0046] 2) Preparation of Cu-SSZ-13 molecu...
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