Integral type metal catalyst for methane catalytic combustion and preparation method
A monolithic catalyst, methane catalytic combustion technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of less research and achieve low weight loss rate , good thermal stability and mechanical stability, good methane catalytic combustion effect
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Embodiment 1
[0039] 30 pieces of 30mm×10mm×0.3mm FeCrAl alloy sheets, weighing 5.666g in total, were longitudinally polished 4 times with 100-mesh and 600-mesh sandpaper, respectively, and then ultrasonically cleaned with acetone and water for 30min. · L -1 h 2 SO 4 and 100 g·L -1 After being treated in a mixed solution of NaCl for 5 min, it was washed with deionized water, dried in an oven at 60°C for 1 h, and placed in a desiccator after cooling for later use.
[0040] Weigh 18g of pseudo-boehmite and add it into 270g of deionized water, stir for 1h, then add 55mL of 1mol·L -1 The nitric acid solution was stirred continuously for 5 hours to obtain alumina sol.
[0041] Then hang the pretreated metal sheet in the alumina sol for 3 minutes, then slowly lift it out, blow off the excess alumina sol remaining on the surface, and dry it in a 120°C oven for 1 hour after preliminary drying with a hair dryer, and then place it in a muffle furnace with 5℃·min -1 Heat up to 500°C for calcinat...
Embodiment 2
[0051] The pretreatment of the FeCrAl alloy sheet and the preparation and coating process of the alumina coating are the same as in Example 1.
[0052] Weigh 17.325g of lanthanum nitrate, 9.803g of manganese acetate and 38.899g of ammonium nitrate and dissolve them in 100ml of deionized water to prepare a metal ion concentration of 0.8 mol L -1 The solution. Add 2 mol·L dropwise to the solution under magnetic stirring -1 The ethylenediamine solution was stabilized for 5 minutes until the pH was 7. Take 30 pieces of the above-mentioned coated Al 2 o 3 The coated alloy sheet was suspended in the solution with adjusted pH value by threading, and then the bottle was moved into an oven at 60°C for 96 hours and then taken out. Separately weigh 4.802 g of ammonium nitrate and dissolve it in 100 ml of deionized water, add 2 mol L dropwise under magnetic stirring -1 ethylenediamine solution until pH = 7. The metal pieces taken out of the oven were washed successively with this so...
Embodiment 3
[0056] The pretreatment of the FeCrAl alloy sheet and the preparation and coating process of the alumina coating are the same as in Example 1.
[0057] Weigh 3.248g of lanthanum nitrate and 1.838g of manganese acetate dissolved in 150mL of deionized water to prepare a concentration of 0.1 mol L -1 solution of metal salts. Weigh 15.712g of ammonium carbonate and dissolve it in 100mL of deionized water to prepare 1mol L -1 The solution. Add 1 mol·L dropwise to the solution under magnetic stirring -1 The ammonium carbonate solution was stabilized for 5 minutes until the pH was 8. Take 30 pieces of the above-mentioned coated Al 2 o 3 The coated metal sheet was suspended in the solution with adjusted pH value by threading, placed in an oven at 60°C for 36 hours, then taken out, and washed 10 times with deionized water. The samples were hung and dried in a 60°C oven for 72 h, and then placed in a muffle furnace at 2°C min -1 Calcined at 1100°C for 5 hours to obtain Al 2 o 3...
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