Preparation method and applications of anti-sulfur motor vehicle tailing gas nitrogen oxide removing composite catalyst
A technology of nitrogen oxides and oxides, which is used in the preparation and application of sulfur-resistant motor vehicle exhaust nitrogen oxides removal composite catalysts, which can solve the problems of insufficient low-temperature activity, insufficient high-temperature activity, and low high-temperature activity. , to achieve the effects of excellent stability and sulfur resistance, good resistance to sulfur dioxide poisoning, and simple preparation method
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Embodiment 1
[0035] Take 0.25g of copper acetate, dissolve it in 50ml of deionized water, add 2.5g of H-SSZ-13 molecular sieve (CHA structure, provided by Catalyst Factory of Nankai University), ion exchange at 40°C for 4h, then filter the obtained sample with Wash with ion water, dry at 110°C for 24h, and finally put into a muffle furnace and bake at 550°C for 5h to obtain Cu-SSZ-13 molecular sieve. The mass content of copper measured by ICP is 2.0%, figure 1 As shown in the XRD spectrum, the Cu-SSZ-13 molecular sieve has a good CHA structure and crystallinity.
Embodiment 2
[0037] Take 0.144g of manganese nitrate tetrahydrate, dissolve it in 0.2ml of ethanol, stir well, then take 1.95ml of n-butyl titanate, mix well with 1ml of ethanol and 1ml of deionized water, add nitric acid to adjust the pH value to 2, and keep stirring. form a sol. Then impregnate the sol on 2.5g of the Cu-SSZ-13 molecular sieve catalyst prepared in Example 1, dry at 110°C for 24h, and roast at 540°C for 5h to obtain a copper-containing molecular sieve-metal oxide composite catalyst, denoted as ex- 1-MnTi, its XRD spectrum is as follows figure 1 As shown, only the characteristic diffraction peaks of the CHA structure can be observed, indicating that the metal oxide component has been uniformly dispersed on the Cu-SSZ-13 molecular sieve.
Embodiment 3
[0039] Take 0.167g of cobalt nitrate hexahydrate, dissolve it in 0.2ml of ethanol, stir well, then take 1.95ml of n-butyl titanate, mix well with 1ml of ethanol and 1ml of deionized water, add nitric acid to adjust the pH value to 2, keep stirring to form Sol. Then impregnate the sol on 2.5g of the Cu-SSZ-13 molecular sieve catalyst prepared in Example 1, dry at 110°C for 24h, and roast at 560°C for 5h to obtain a copper-containing molecular sieve-metal oxide composite catalyst, denoted as ex- 2-CoTi, its XRD spectrum is as follows figure 1 As shown, only the characteristic diffraction peaks of the CHA structure can be observed, indicating that the metal oxide component has been uniformly dispersed on the Cu-SSZ-13 molecular sieve.
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