Oxidation catalytic device for reducing biodiesel toxic emission
A biodiesel, oxidation catalysis technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. The process and temperature field distribution characteristics are not considered to achieve the effect of reducing toxic emissions from combustion
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Embodiment 1
[0028] An oxidation catalytic device for reducing toxic emissions from biodiesel, using cordierite or SiC material honeycomb ceramic straight-through carrier, based on the difference in catalytic activity of Pt and Pd catalysts for toxic emissions and the difference in DOC flow field and temperature field, Catalyst coating is carried out in stages and layers, and the front 1 / 2 to 2 / 3 area of the honeycomb ceramic carrier is coated with Pd-based catalyst, with a loading capacity of 40g / ft 3 -60g / ft 3 ; The rear 1 / 2 to 2 / 3 area of the honeycomb ceramic carrier is coated with a Pt-based catalyst with a loading capacity of 10g / ft 3 -30g / ft 3 ; The middle area is the overlapping area of catalyst coating. The catalysts are all multi-layer coated, and the first layer of coating on the carrier contact surface is Al 2 o 3 ; The second coating is CeO 2 or La 2 o 3 and other rare earth element oxides; the third layer of coating is a noble metal catalyst, in which the front e...
Embodiment 2
[0030] The fabrication steps of the oxidation catalytic device in embodiment 1 are as follows:
[0031] Step 1: Al 2 o 3. Zirconium acetate is added to deionized water at a weight ratio of 0.92-0.98:0.05-0.1, fully stirred to prepare the first coating slurry, and then nitric acid is added dropwise to adjust the slurry until the pH is less than 5.0;
[0032] Step 2: Slurry ball milling, the first coating slurry is ground through a planetary ball mill, the speed of the planetary ball mill is 280-380 rpm, the running time is 3-5 hours, and the particle size D90 of the slurry is ground to 2-20 μm;
[0033] Step 3: Determination of solid content, take 5g of slurry in a crucible, place the crucible in a muffle furnace at 550-600°C and roast for 10-20min, cool to room temperature, weigh the powder mass, divide the powder mass by 5g , calculate the solid content of the first coating slurry;
[0034] Step 4: Coating, place the honeycomb ceramic carrier in the coating chamber of the ...
Embodiment 3
[0054] Such as figure 1 The shown oxidation catalytic device for reducing the toxic emission of biodiesel can reduce the toxic emission of biodiesel. The oxidation catalytic device includes a straight-through carrier 1 and a composite coating coated in the straight-through carrier 1, and the composite coating includes Al 2 o 3 Coating 2, rare earth element oxide coating 3 and noble metal catalyst coating 4, the noble metal catalyst coating 4 includes a Pd-based catalyst coating 5 located at the front of the straight-through carrier 1 and a Pt-based catalyst at the rear of the straight-through carrier 1 Coating 6 , the overlapping portion between the Pd-based catalyst coating 5 and the Pt-based catalyst coating 6 forms a precious metal catalyst overlapping coating 7 .
[0055] Wherein, the straight-through carrier 1 is a honeycomb ceramic straight-through carrier, the interior of the honeycomb ceramic straight-through carrier has a honeycomb porous structure, and the composit...
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