Catalytic denitrification method
A catalytic denitration and catalyst technology, applied in the field of catalytic denitration, can solve the problems of complex process and low NO removal rate, and achieve the effects of simple process, low operating cost and low operating temperature
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[0019] Example 1
[0020] Preparation of Cu(0.4)-NiO composite metal oxide catalyst by co-precipitation method x , Ni(0.4)-FeO x , Cu(1)-NiO x And Cu(2.5)-NiO x (E.g. Cu(0.4)-NiO x It means that the stoichiometric ratio of Cu to Ni in the composite metal oxide is 0.4:1). According to the stoichiometric ratio, take the required metal nitrate solution (concentration of 1mol / L) and mix evenly, and slowly drop the mixed metal salt solution into 1mol / L Na 2 CO 3 (Control the temperature of the solution at 50°C) to proceed the precipitation reaction. When the control end point PH is 8, stop the dripping. Continue to stir and age for 3h at the same temperature. Then wash, filter, and dry at 60°C for 5 hours to obtain the catalyst precursor, which is calcined in a muffle furnace at 400°C for 5 hours to obtain the required stoichiometric ratio of Cu(0.4)-NiO x , Ni(0.4)-FeO x , Cu(1)-NiO x And Cu(2.5)-NiO x Composite metal oxide catalyst sample.
Example Embodiment
[0021] Example 2
[0022] The method of the present invention includes filling a reaction tube of a microwave catalytic reactor device with a catalyst to form a microwave catalytic reaction bed, and the gas to be processed undergoes a gas-solid phase reaction when passing through the microwave catalytic reaction bed for denitration treatment; the composite metal oxide The catalyst includes Cu-Ni composite metal oxide and Ni-Fe composite metal oxide, the composition is Cu(0.4)-NiO x , Ni(0.4)-FeO x , Cu(1)-NiO x And Cu(2.5)-NiO x The catalyst is filled in the reaction tube of the microwave catalytic reactor device. When the processed gas passes through the microwave catalytic reaction bed, the NO in the gas directly decomposes and reacts to generate environmentally friendly N 2 And O 2 , In order to achieve the purpose of direct denitration.
[0023] In this embodiment, the waste gas provided by Dalian Date Gas Co., Ltd. is N 2 The mixed gas composed of NO and NO, in which the NO con...
Example Embodiment
[0029] Example 3
[0030] It is basically the same as Example 2, except that the oxygen content in the intake air is changed to 0-10%.
[0031] The packed catalyst is Cu(0.4)-NiO x , Ni(0.4)-FeO x , Cu(1)-NiO x And Cu(2.5)-NiO x . The catalyst filling amount is 2g, and the mesh number is 20-60 mesh. The intake NO concentration is 1000 ppm, the oxygen content in the intake is changed to 0%, 5%, 7.5%, 10%, the residence time of the gas in the microwave catalytic reaction bed is 1s, and the reaction pressure is normal pressure. The microwave power was adjusted to maintain the catalyst bed temperature at 250°C respectively, and the oxidation resistance of the catalyst in the microwave catalytic decomposition of NO was investigated. The results are shown in Table 2.
[0032] Table 2
[0033]
[0034] It can be seen from Table 2 that in the presence of oxygen, the NO conversion rate is not affected by the oxygen concentration on various catalysts, indicating that the composite metal oxid...
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