Copper-iron-containing bimetal porous catalyst and preparation method thereof
A copper-iron bimetallic and porous catalyst technology, applied in the field of flue gas denitrification, can solve the problems of poisoning and deactivation, narrow temperature window, difficult to reach the working state, etc., and achieve excellent nitrogen oxide purification effect
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Embodiment 1
[0018] Embodiment 1: the preparation of 1.2% CuFe-Y catalyst
[0019] 1) Using 1M copper chloride / iron bimetallic solution as the precursor, introduce CuFe into Y molecular sieve by ion exchange method. The exchange method is: weigh 100g of Y sample and place it in a 250ml round bottom flask, and then add it according to the metering ratio 50ml of copper chloride / iron bimetallic solution, then add deionized water to 200ml, stir in a water bath at 80°C for 15h, then suction filter, wash and dry. The above steps were repeated twice, and finally the measured CuFe content was 1.2%, and then calcined at 550° C. for 10 h to obtain 1.2% CuFe-Y.
[0020] 2) The 1.2% CuFe-Y catalyst is directly extruded to obtain a self-supporting monolithic catalyst.
Embodiment 2
[0021] Embodiment 2: Preparation of 3.1% CuFe-Y catalyst
[0022] 1) Using 1M copper sulfate / iron bimetallic solution as a precursor, introduce CuFe into Y by ion exchange method. The exchange method is: weigh 100g of Y sample and place it in a 250ml round bottom flask, and then add 50ml of Copper sulfate / iron bimetallic solution, then add deionized water to 200ml, stir in 80°C water bath for 18h, then suction filter, wash and dry. The above steps were repeated twice, and finally the measured CuFe content was 3.1%, and then calcined at 550° C. for 10 h to obtain 3.1% CuFe-Y.
[0023] 2) The 3.1% CuFe-Y catalyst is directly extruded to obtain a self-supporting monolithic catalyst.
Embodiment 3
[0024] Embodiment 3: the application of CuFe-Y catalyst in nitrogen oxide ammonia selective catalytic reduction
[0025] Put 5 g of 1.2% CuFe-Y self-supporting monolithic catalyst into a stainless steel fixed-bed reactor with a length of 50 cm and an internal diameter of 2 cm. The catalyst is placed in the central constant temperature zone of the reactor. At the reaction inlet: nitrogen oxides=1000 ppm; =1100ppm; Oxygen = 5%; Water vapor = 12%; Sulfur dioxide = 30ppm; Reaction temperature = 150~500°C, reaction space velocity is 30000h -1 . The product was analyzed online with a nitrogen oxide analyzer (NOVAL PLUS multifunctional flue gas analyzer). Catalytic results show that: 1.2% CuFe-Y has excellent NH 3 -SCR performance, after the catalytic purification process, the conversion rate of nitrogen oxides can reach 90% at 350°C.
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