Application of surface-modified cordierite in realizing soot conversion
A technology of surface modification and soot conversion, applied in chemical instruments and methods, chemical/physical process, physical/chemical process catalyst, etc., can solve the problem of high temperature of particulate filter body
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Embodiment 1
[0031] Cut cordierite to length: width: height = 10mm: 10mm: 5mm, soak it in a mixed solution of acetone / ethanol volume ratio of 3 for 4 hours, then dry it at 60°C for 4 hours; then place the dried cordierite at a concentration of 1mol / L HNO 3 Soak in the solution for 4 hours, rinse repeatedly with distilled water, and dry at 100°C for 12 hours for later use. Weigh hydrogen-containing polysiloxane (PHMS) and 1,3,5,7-tetramethyl 1,3,5,7-tetravinylcyclotetrasiloxane (D 4 Vi) Mix 1g of each in a beaker, supergenerate and vibrate for 10min, make the two fully mixed, drop a drop of methylvinylsiloxane coordination platinum catalyst with a concentration of 3000ppm into it, and continue supergenerate and vibrate for 10min to obtain SiOC precursor solution . Put the pretreated cordierite into the SiOC solution and soak for 30 minutes and blow through the holes to make a layer of SiOC precursor solution adhere to the surface of the cordierite medium, and then dry it at 60°C for 4-6 hour...
Embodiment 2
[0034] Cut cordierite to length: width: height = 10mm: 10mm: 5mm, soak it in a mixed solution of acetone / ethanol volume ratio of 3 for 4 hours, then dry it at 60°C for 4 hours; then place the dried cordierite at a concentration of 1mol / L HNO 3 Soak in the solution for 4 hours, rinse repeatedly with distilled water, and dry at 100°C for 12 hours for later use. Weigh hydrogen-containing polysiloxane (PHMS) and 1,3,5,7-tetramethyl 1,3,5,7-tetravinylcyclotetrasiloxane (D 4 Vi) Mix in a beaker and vibrate for 10 minutes to make the two fully mixed, drop a drop of methyl vinylsiloxane coordinated platinum catalyst into it, and continue to vibrate for 10 minutes to obtain a SiOC precursor solution. Put the pretreated cordierite into the SiOC solution and soak for 30 minutes and blow through the holes to make a layer of SiOC precursor solution adhere to the surface of the cordierite medium, and then dry it at 60°C for 4-6 hours to prepare the cordierite medium A sample of SiOC precurso...
Embodiment 3
[0039] The pretreatment of cordierite, surface SiOC precursor coating, preparation of PS microspheres, and the preparation of SiOC precursor solution in this example are the same as in Example 2, except that 0.4g of PS microspheres are added to the SiOC precursor solution After ultrasonic dispersion for 2 hours, a highly dispersible PS suspension was obtained. The pretreated cordierite sample was transferred to the PS suspension, and after being immersed for 4 hours, the back blast through holes were taken out, and then placed at a constant temperature of 50° C. for 4 hours to obtain a composite cross-linked body.
[0040] The composite cross-linked body is pyrolyzed under flowing argon, and argon gas is passed in for 5 minutes to exhaust the air in the furnace. The gas flow is 300sccm, and the argon gas is continued to be passed in, and the temperature rise rate is 1℃ / min. Constant temperature at 440°C for 1 hour, then rise to 800°C at a temperature increase rate of 1°C / min, kee...
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