Three dimensional ordered macroporous structure Ag micrometer beam/Eu0.6Sr0.4FeO3 composite catalyst, preparation and application thereof
A eu0.6sr0.4feo3, composite catalyst technology, applied in the direction of physical/chemical process catalysts, incinerators, lighting and heating equipment, etc., can solve the problems of no literature and patent reports, and achieve the effect of strengthening the dispersion effect and
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Embodiment 1
[0019] Embodiment 1: 1. prepare the silver nitrate solution of 5mmol / L: weigh 0.3398g AgNO 3 Dissolve in 50mL deionized water, stir well to dissolve, add 0.3330g polyvinylpyrrolidone (PVP), adjust the volume of the solution to about 80mL, and finally adjust the pH value of the solution system with a NaOH solution with a concentration of 0.1mol / L 8~9, and dilute to 400mL with deionized water; ②Prepare 20mmol / L NaBH 4 Reduction solution: 0.1515g NaBH 4 Fully dissolved in 200mL deionized water; ③Ultrasonic-assisted membrane reduction method (UAMR method) to prepare the three-dimensional ordered macroporous structure Eu loaded with bundled Ag 0.6 Sr 0.4 FeO 3 : Take the AgNO prepared in ① 3 Dilute 4.64mL of dilute solution to 200mL, weigh 0.25g Eu 0.6 Sr 0.4 FeO 3 The catalyst is impregnated in it, take the NaBH prepared in ② 4 2.32mL of the dilute solution was diluted to 200mL, and then the beakers containing the two solutions were respectively placed in the corresponding...
Embodiment 2
[0020] Embodiment 2: other steps and implementation method are the same as embodiment 1, only in step 3.: get AgNO 3 Dilute 27.81mL of dilute solution to 200mL, weigh 0.50g Eu 0.6 Sr 0.4 FeO 3 The catalyst is impregnated in it, and the prepared NaBH 4 13.91mL of dilute solution was diluted to 200mL. At this time, the Ag microbeams / Eu with a theoretical loading of 3wt% were obtained. 0.6 Sr 0.4 FeO 3 supported catalyst. The particle size of the Ag particles prepared in this example is about 1nm, and the supported catalyst exhibits a pure perovskite crystal structure, and Ag nanoparticles are aggregated into bundles and distributed on the surface of the carrier. The diameter of each bundle is about 100nm, and the length is about 500~1500nm, the obtained three-dimensional ordered macroporous structure 3wt%Ag micro beam / Eu 0.6 Sr 0.4 FeO 3 The catalytic activity test result of catalyst to toluene shows that its T 50% and T 90% are about 254°C and 296°C respectively, wh...
Embodiment 3
[0021] Embodiment 3: other steps and implementation method are the same as embodiment 1, only in step 3.: get AgNO 3 Dilute 23.18mL of dilute solution to 200mL, weigh 0.25g Eu 0.6 Sr 0.4 FeO 3 The catalyst is impregnated in it, and the prepared NaBH 4 11.59mL of dilute solution was diluted to 200mL. At this point, Ag microbeams / Eu with a loading of 5wt% were obtained 0.6 Sr 0.4 FeO 3 supported catalyst. The particle size of Ag particles prepared in this example is about 1nm, and the supported catalyst exhibits a pure perovskite crystal structure. 0.6 Sr 0.4 FeO 3 The comparison of the electron microscope photos shows that the Ag material may be loaded on the surface of the procatalyst pore channel, because the prepared Ag particles are very small, and the distribution state of a single Ag particle cannot be determined. 0.6 Sr 0.4 FeO 3 The catalyst is still polycrystalline, and the catalytic activity test result to toluene shows that its T 50% and T 90% are about...
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