Core-shell catalyst and preparation method and application thereof
A catalyst, core-shell type technology, applied in the field of core-shell type catalyst and its preparation, can solve the problems of low carbon dioxide conversion rate, increase of absolute decomposition of CO2, low conversion rate value, etc., to achieve easy industrial production and improve stability , the effect of improving the decomposition rate
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[0037] An embodiment of the present invention provides a method for preparing a core-shell catalyst. The core-shell catalyst prepared by this method is mainly used in the field of plasma activation and decomposition of carbon dioxide, especially in a dielectric barrier discharge plasma device to promote the generation of carbon dioxide. break down. Specifically, the preparation method of the core-shell catalyst comprises the following steps:
[0038] 1) The core layer is roughened or coupled, sensitized, and activated in sequence to obtain the first precursor; wherein, the core layer is any one of zirconium dioxide, aluminum oxide, silicon dioxide or Several mixtures.
[0039] Preferably, the core layer is a solid spherical structure with a diameter of 0.2-10 mm composed of any one or a mixture of zirconium dioxide, aluminum oxide and silicon dioxide.
[0040] Preferably, this step specifically includes:
[0041] 11) Soak and rinse the core layer with a roughening agent for...
Embodiment 1
[0064] Treatment of the nuclear layer: put 2mm solid glass beads (the main component is silicon dioxide) in sodium fluoride and hydrofluoric acid solution, rinse for 30 minutes, and coarsen them, then filter the solid glass beads and place them in a blast In a drying oven, dry at 80°C to obtain a roughened core layer; place the roughened core layer in 1% tin protochloride aqueous solution, soak for 30 minutes to sensitize, and then put the solid glass After the beads are filtered, they are placed in a blast oven and dried at 80°C to obtain a sensitized core layer; the sensitized core layer is placed in 0.5% silver ammonia solution, stirred for 10 minutes, and then activated. The solid glass beads were filtered and then placed in a blast drying oven, and dried at 80° C. to obtain the first precursor.
[0065] Loading the shell layer on the core layer: placing the first precursor in 2.0% ferrous chloride aqueous solution, adding 5 g of urea, and mixing evenly to obtain a mixture...
Embodiment 2
[0070] The treatment of the core layer: put 1mm solid zirconia beads in an absolute ethanol solution with a mass fraction of 5% KH550, and reflux at 50°C for 1 hour for coupling treatment, and then filter the solid zirconia Afterwards, place in an oven and dry at 100°C for 10 hours to obtain a coupled core layer; place the coupled core layer in an aqueous solution of 0.2% stannous chloride, soak for 2 hours, and perform sensitization treatment , and then filter the solid zirconia beads and place them in a blast drying oven, and dry them at 80°C to obtain a sensitized core layer; then place the sensitized core layer in 0.05% PdCl 2 In the aqueous solution, stir for 30 minutes to activate, and then filter the activated solid zirconia beads and dry them in a blast drying oven at 80° C. to obtain the first precursor.
[0071] Load the shell layer on the core layer: put the first precursor in a 0.5% cerium nitrate aqueous solution, mix well, vacuum rotary distillation at 100°C, tak...
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