Catalyst for hydrogen selective combustion reaction and preparation method thereof
A combustion reaction and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of high loss rate of raw materials, short catalyst life, etc. high sex effect
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Embodiment 1
[0019] A certain amount of dry powder pseudo-boehmite, alumina trihydrate (ratio 30:70) and 5% of the total weight of aluminum oxide are loaded into the rolling ball machine, and the rolling machine is started, and 2% (weight) is sprayed. The dilute nitric acid binder, stirring continuously to fully mix the dry powder and water, when the binder spraying ends, the alumina material rolls into a particle cluster with a diameter of 1-2mm, and then continuously and evenly sprinkles the dry powder and binder, Make the particles reach 4mm. Vacuum drying at 80°C for 24 hours, air drying at 300°C for 2 hours, and calcination in an oxygen atmosphere at 1200°C for 10 hours to make spherical α-Al 2 o 3 carrier.
[0020] 40 grams of 15% alumina sol, 60 grams of 2% glycerin solution, and 0.3 grams of Span 80 were made into slurry. Then add 0.6 grams of potassium feldspar and 40 grams of γ-Al with a particle size of 20 microns or less to this mixture. 2 o 3 powder (specific surface area...
Embodiment 2
[0023] Add aluminum oxide, silica sol, and magnesium oxide into the kneader according to the ratio, mix evenly, then add dilute nitric acid with a concentration of 2% (weight), knead to form a lump material, extrude into strips and press balls, and dry in the air at 100°C 4 hours, 300 DEG C in air for 4 hours, and 1400 DEG C in air for 2 hours to make a spherical cordierite carrier with a diameter of 3 mm.
[0024] SnCl 2 dissolved in water, and the above solution was impregnated in θ-Al 2 o 3 (solid-to-liquid ratio 1:2) powder, dried at 150°C for 2 hours, calcined at 400°C for 4 hours, and then pulverized to below 15 microns. 40 grams of 15% alumina sol, 60 grams of 3% polyacrylamide solution, and 0.4 grams of nonylphenol ethoxylate-5 were made into slurry. Then add 0.3 g of calcium silicate, 40 g of θ-Al impregnated with Sn to this mixture 2 o 3 powder. After stirring for about ten minutes, 2.3 g of 25% KCl aqueous solution was added, and the resulting slurry was subje...
Embodiment 3
[0027] The preparation method of the cordierite carrier is the same as in Example 2.
[0028] 35 grams of 10% alumina sol, 60 grams of 4% cyclodextrin solution, and 1.0 gram of Tween-80 were slurried. After stirring for about ten minutes, add 0.52 g of 50% SnCl 4 solution, 0.4 grams of calcium silicate, 0.15 grams of barium oxide and 40 grams of δ-Al with a particle size of 20 microns or less 2 o 3 pink. The resulting slurry was ball milled for 4 hours at room temperature to control the particle size below 10 microns. The slurry was sprayed onto the cordierite carrier, dried at 80°C for 2 hours, then heated to 150°C and dried again for 2 hours, and finally calcined at 900°C for 8 hours to obtain a layered composite carrier.
[0029] Dissolve lithium nitrate and sodium chloroplatinite in water respectively to prepare a mixed solution, adjust the solution with HCl to make the pH value about 4, then heat the solution to 80°C, and impregnate the prepared layered composite carr...
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