Preparation method of anti-corrosion photocatalytic three-dimensional honeycomb ceramic network
A honeycomb ceramic and catalytic three-dimensional technology, applied in chemical instruments and methods, separation methods, catalyst protection, etc., can solve the problems of photocatalytic activity decline, photocatalyst acid strength reduction, etc., achieve long-lasting photocatalytic activity, prevent catalyst loss, The effect of easy operation
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[0023] (1) Preparation of three-dimensional honeycomb ceramic mesh carrier
[0024] The main raw materials of honeycomb ceramic mesh are clay, talc, alumina, light-burned magnesium powder, etc., and an appropriate amount of binder and loss-of-ignition agent are added. The preparation process is as follows: firstly carry out the proportioning and mixing of raw materials, kneading, aging; then vacuum mud, extrusion molding, cutting, and online inspection; then drying, cutting, and firing at 1280-1320°C; finally, surface modification and inspection . The finished product is a three-dimensional honeycomb ceramic network carrier with a size of 250×250×15mm, a wall thickness of ≤0.2mm, a hole density of 31-62 holes / square centimeter, and a water absorption rate of less than 18%. The samples were cleaned with an ultrasonic cleaner at 25°C and 80HZ for 40 minutes, and dried at 120°C for later use.
[0025] (2) Preparation of doped titanium-based sol
[0026] Under the condition of ...
Embodiment 1
[0039] Preparation of doped titanium-based sol: Under stirring conditions, mix butyl titanate, n-butanol, and diethanolamine in a molar ratio of 1:10:2 to obtain liquid A; mix cerium nitrate, iron nitrate, n-butanol, ice Acetic acid and water were mixed at a molar ratio of 0.005:0.009:3:9:2 to obtain liquid B; then liquid B was slowly dropped into liquid A and stirred for 60±30 min to obtain a uniform and transparent doped titanium-based sol.
[0040] The loading of doped titanium-based sol on the honeycomb ceramic mesh: using the sol-gel method, the three-dimensional honeycomb ceramic mesh prepared according to the specific embodiment (1) is immersed in the doped titanium-based sol, and after 20 minutes, the honeycomb ceramic mesh is placed at 1 mm / sec. The carrier was pulled out of the liquid surface and dried; then the temperature was programmed and roasted, starting at room temperature at 5°C / min, keeping at 100°C, 200°C, 300°C, and 400°C for 30 minutes, and at 480°C for 12...
Embodiment 2
[0050] The raw material and molar ratio of preparing B liquid are changed into ferric nitrate: n-butanol: glacial acetic acid: water = 0.009: 3: 9: 2, and other contents include honeycomb ceramic mesh carrier, A solution, sol preparation, anti-corrosion acid solution, The drying and roasting method of wet sample, and product performance measurement etc. are all identical with embodiment 1.
[0051] Test results:
[0052] The BET method shows that the surface area of the three-dimensional honeycomb ceramic mesh is 13.0-16.0cm 2 / cm 3 ;
[0053] Compressive strength, loading capacity, the measurement result of SEM and XRD is close to embodiment 1;
[0054] The removal rates of acetone, isopropanol and methylene chloride gas decreased to 90.1%, 87.3% and 85.1%.
[0055] It shows that the effect of doping ferric nitrate on removing VOCs is worse than that of doping ferric nitrate + cerium nitrate.
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