Method of preparing SAPO-11 supported nano palladium catalyst through ultrasound-assisted reduction
A SAPO-11, ultrasonic-assisted technology, applied in molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of particle enlargement, palladium nanoparticle agglomeration, low dispersion, etc., and achieve high metal dispersion , small size, simple operation
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Embodiment 1
[0022] Take 5mL, 0.01mol / L Na 2 PdC1 4 Put the solution in a flask, add 1g SAPO-11 molecular sieve to it, mix and impregnate under ultrasonic power of 200W for 30min, add 30mL of ethylene glycol, increase the ultrasonic power to 600W, and perform a reduction reaction for 30min. The resulting mixture was centrifuged, and after removing the supernatant, the precipitate was washed three times with ethanol, and dried at 80° C. for 2 h to obtain Pd(0.5) / SAPO-11.
[0023] The SEM and TEM image of the Pd(0.5) / SAPO-11 that present embodiment obtains, N Physical adsorption curve and XRD pattern are respectively as follows Figure 1~4 shown. Ultrasonic action destroys the SAPO-11 structure, providing a larger contact area for subsequent loading. The palladium nanocrystals in Pd(0.5) / SAPO-11 prepared in this example have a face-centered cubic structure and are successfully loaded on the SAPO-11 carrier. The particle diameter of the palladium nanoparticles ranges from 1.26nm to 6.01nm,...
Embodiment 2
[0025] Take 2.5mL, 0.02mol / L of H 2 PdCl 4 Put the solution in a flask, add 1g SAPO-11 molecular sieve to it, mix and impregnate under 100W ultrasonic power for 60min, add 30mL ethylene glycol, increase the ultrasonic power to 600W, and perform the reduction reaction for 10min. The resulting mixture was centrifuged, and after removing the supernatant, the precipitate was washed three times with ethanol, and dried at 80° C. for 2 h to obtain Pd(0.5) / SAPO-11.
Embodiment 3
[0027] Take 5mL, 0.01mol / L Na 2 PdC1 4 Put the solution in a flask, add 1g SAPO-11 molecular sieve to it, mix and impregnate under 300W ultrasonic power for 30min, add 40mL ethylene glycol, increase the ultrasonic power to 500W, and perform a reduction reaction for 30min. The resulting mixture was centrifuged, and after removing the supernatant, the precipitate was washed three times with ethanol, and dried at 80° C. for 2 h to obtain Pd(0.5) / SAPO-11.
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