A high-temperature flue gas dedusting, denitrification and demercuration catalytic membrane modified by ag and two-dimensional mxene and its preparation method
A high-temperature flue gas, catalytic membrane technology, applied in the field of air purification, can solve the problem of less application in the field of catalysis, and achieve the effects of simplifying the flue gas purification process, improving the promotion value, and adjusting the load capacity
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Embodiment A
[0034] like figure 1 As shown, the preparation method of the catalytic membrane for high-temperature flue gas dust removal, nitrification and mercury removal modified by Ag and two-dimensional MXene according to a typical embodiment of the present invention includes the following steps:
[0035] (1) Take MXene solution 1 and dilute it with deionized water, add AgNO 3 , after 1-2 hours of ultrasound;
[0036] (2) Disperse the active metal, dispersant and carrier 2 in sub-water, and ultrasonicate for 1-2 hours;
[0037] (3) mixing the solutions obtained in step (1) and step (2), adding a binder with stirring, and stirring for 1 to 4 hours to obtain an active solution;
[0038] (4) Coat the prepared catalytic layer sol in the pores of the support body 3 through the suction side, then place it in a drying oven to dry and then calcine to obtain a catalytic membrane. The catalytic membrane is composed of a ceramic support body and is distributed in the porous ceramic The active c...
Embodiment 1
[0040] 10gTi 3 AlC 2 The particles were placed in 40% HF acid for 2 hours, centrifuged, washed with water and alcohol, and dried at low temperature to obtain Ti 3 C 2 Tx powder, Ti 3 C 2 The Tx powder was dispersed in deionized water, the concentration was 2 mg / mL, sonicated for 2 h, and the supernatant was collected by centrifugation to obtain the MXene nanosheet dispersion (such as figure 2 shown). Dilute 5mL of MXene nanosheet dispersion to 50mL, add 0.09g AgNO 3 , ultrasound 2h. Take vanadium nitrate and tungsten nitrate in 250mL deionized water, add 1.6g oxalic acid, add 5g5nmTiO 2 , 30mL ethylene glycol, the two solutions were mixed after ultrasonication for 2h, and 2g of 10%-PVA was added to obtain an active solution (such as image 3 shown), the V loading in the active solution was 1.8 wt% and the W loading was 8 wt%. The tubular membrane (the average pore diameter of the support is about 40um, such as Figure 4 shown) in the active solution after immersion an...
Embodiment 2
[0043] The MXene nanosheet dispersion was prepared according to the method shown in Example 1, 7mL of the MXene nanosheet dispersion was diluted to 50mL, 0.94g AgNO3 was added, and sonicated for 2h. Take vanadium nitrate, molybdenum nitrate, yttrium nitrate in 250mL deionized water, add 4g20nmTiO 2 , 2g40nmZrO 2 , 56mL of glycerol, after ultrasonication for 2h, the two solutions were mixed, and 3.1g of 10%-methylcellulose was added to obtain an active solution. The amount is 8 wt%. The plate membrane (average pore size 10um) was immersed and sucked in the active solution for 2 minutes, then dried at 70°C and 40% RH for 48h, and placed in a muffle furnace with a heating rate of 0.5°C / min and a temperature of 450°C. sintered for 3 h to obtain a catalytic film (the surface morphology of the catalytic film is as follows: figure 2 shown).
[0044] Tests show that the dust removal efficiency of the prepared catalytic membrane is 98%, the NOx conversion rate at 200-450°C is kept...
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