Preparation method for fiber reinforced porous carbon based electrocatalytic filtering material
A porous carbon and electrofiltration technology, applied in catalyst activation/preparation, chemical instruments and methods, separation methods, etc., can solve the problems of insufficient metal oxide layer binding force, low mechanical strength performance, etc., and achieve enhanced binding force and electronic The effect of transmission capacity, not easy to passivation and deactivation, and stable performance
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[0018] A method for preparing a porous carbon-based electric filter material with a high-strength fiber substrate, comprising the following steps:
[0019] (1) Carbon substrate pretreatment, including the following steps:
[0020] The carbon matrix is carbonized in a tubular muffle furnace under the protection of nitrogen at a high temperature of 300-400 °C for 1-2 hours, and then soaked in a volume ratio of 1:1:10-1:1:20 with a mass percentage of 37 % concentrated hydrochloric acid, 30% mass percent hydrogen peroxide, and deionized water for 10-25 minutes, then alternately wash the carbon matrix with deionized water and absolute ethanol until it is neutral, and place it in an oven at 90 Dry at ~105°C to remove moisture from the substrate. The purpose of pretreatment is to modify the surface of the substrate with inorganic acid to reduce the stress between the substrate surface and the metal interface.
[0021] (2) Select high-strength fiber material (which can be any one ...
Embodiment 1
[0039] (1) Carbon substrate pretreatment, including the following steps:
[0040] The carbon substrate was carbonized in a tubular muffle furnace under the protection of nitrogen at a high temperature of 400 ° C for 1 hour, and then soaked in concentrated hydrochloric acid with a mass percentage of 37% and 30% hydrochloric acid with a volume ratio of 1:1:10. Treat in a mixed solution of hydrogen peroxide and deionized water for 15 minutes, wash the carbon substrate alternately with deionized water and absolute ethanol until neutral, and place it in an oven at 105°C to dry to remove the moisture from the substrate.
[0041] (2) Select ceramic fibers as the substrate support layer, mix the pretreated carbon matrix with the binder and place it in the tablet press mold as the fiber material of the substrate support layer, the binder The amount added accounts for 1wt.% of the mass fraction of the pretreated carbon matrix, the binder is polyvinyl alcohol, the molding pressure is con...
Embodiment 2
[0051] (1) Pretreatment of porous carbon-based materials: Carbonize the carbon substrate at a high temperature of 300°C for 2 hours in a tubular muffle furnace under the protection of nitrogen, and soak the substrate in 37% hydrochloric acid, 30% hydrogen peroxide and Treat in a mixed solution composed of deionized water (volume ratio 1:1:20, respectively) for 25 minutes, alternately wash with deionized water and absolute ethanol until neutral, and place in an oven to dry at a constant temperature of 90°C.
[0052] (2) Select silicon carbide fiber as the substrate support layer, put the porous carbon-based material pretreated in step (1) into the mold of the tablet press for compression molding, add 5wt.% polyvinyl alcohol binder, The forming pressure was controlled at 100 MPa, and the holding time was controlled at 10 min. The carbon substrate was pressed into a flat laminated structure, and placed in a muffle furnace for high temperature carbonization at 400 °C for 1 h.
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