A kind of monoatomic palladium-based catalyst and its preparation method and application
A catalyst and atomic technology, applied in the field of single-atom palladium-based catalysts and their preparation, can solve problems such as environmental damage, and achieve the effects of simple method, excellent catalytic activity and stability
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[0036] The present invention also provides a kind of preparation method of above-mentioned catalyst, comprises the following steps:
[0037] A) adding silicon source and zirconium dioxide to an organic solvent for reflux reaction and drying to obtain amorphous silicon dioxide-modified zirconium dioxide;
[0038] B) Mixing the palladium source and amorphous silica-modified zirconia in an organic solvent and then impregnating them, loading the palladium source on the amorphous silica-modified zirconia, drying and calcining to obtain single-atom Pd / SiO 2 -ZrO 2 catalyst.
[0039] In the present invention, silicon source and zirconium dioxide are firstly added into an organic solvent for reflux reaction and dried to obtain zirconium dioxide modified by amorphous silicon dioxide.
[0040] The specific method for preparing amorphous silica-modified zirconia is as described above, and will not be repeated here.
[0041] After obtaining amorphous silica-modified zirconia, the pal...
Embodiment 1
[0054] Take a certain amount of 10g of zirconium dioxide and 5.5ml of n-octyltriethoxysilane dissolved in toluene, reflux at 110°C for 3 hours, centrifuge, put in an oven and dry at 120°C for 6h to obtain amorphous silica-modified Zirconia SiO 2 -ZrO 2 Dissolve the modified zirconium dioxide and palladium acetate in toluene, the mass fraction of palladium source in the catalyst is 0.23%, ultrasonic 30min at room temperature after mixing the modified zirconium dioxide and palladium source, impregnated for 2 hours at room temperature , and then dried in an oven at 120°C for 6h, and finally transferred the sample to a quartz crucible, calcined in a tube furnace at 500°C for 3h in an air atmosphere, cooled naturally to room temperature, and ground to obtain a pale yellow powder catalyst. The preparation is complete.
[0055] see figure 1 and figure 2 , figure 1 For the monoatomic Pd / SiO obtained in Example 1 2 -ZrO 2 Transmission electron microscope scanning image of the c...
Embodiment 2
[0060] According to the preparation method of the present invention in Example 1, the loading amount of Pd was changed. Pretreatment in a reaction atmosphere at 500 °C for 1 h. The evaluation method of the catalyst is the same as in Example 1. Activity tests showed that 0.46wt% single-atom Pd / SiO prepared using this method 2 -ZrO 2 The methane conversion rate of the catalyst is 100% under the condition of 380° C., and the activity of the catalyst remains unchanged after being used for 60 hours.
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