A kind of platinum-based selective hydrogenation catalyst and its preparation method and application
A hydrogenation catalyst and selective technology, which is applied in the preparation of amino compounds, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of low catalyst activity and selectivity, low catalytic efficiency, etc., and achieve improved dispersion, Effect of low particle size dependence and high dispersion of nanometals
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Embodiment 1
[0022] Put the activated carbon into a pulverizer and pulverize it into powder, sieve out 100-300 mesh activated carbon, add it to a nitric acid solution with a concentration of 3mol / L, and place it in an ultrasonic generator for ultrasonic immersion for 8 hours, then wash the activated carbon with deionized water to medium and filtered to obtain a pretreated activated carbon filter cake. With 30mL concentration of 0.01g / mL chloroplatinic acid solution, with a concentration of 0.5mol / L K 2 CO 3 The aqueous solution was adjusted to pH 2.5 and used as impregnation solution for catalyst preparation. Then add the activated carbon filter cake to the above impregnation solution, stir and impregnate at 75°C and ultrasonically for 2.5 hours, filter, add deionized water to the filter cake to make a slurry with a volume of 100mL, add formic acid dropwise for reduction by chemical reduction method, then filter and dry After washing until there is no chloride ion, the filter cake is tra...
Embodiment 2
[0024] Put the activated carbon into a pulverizer and pulverize it into powder, sieve out 100-300 mesh activated carbon, add it to a nitric acid solution with a concentration of 3mol / L, and place it in an ultrasonic generator for ultrasonic immersion for 8 hours, then wash the activated carbon with deionized water to medium and filtered to obtain a pretreated activated carbon filter cake. 30 mL of chloroplatinic acid solution with a concentration of 0.01 g / mL was adjusted to a pH value of 2.5 with a KOH aqueous solution with a concentration of 0.5 mol / L as the impregnating solution prepared by the catalyst. Then add the activated carbon filter cake to the above impregnation solution, stir and impregnate at 75°C and ultrasonically for 2.5 hours, filter, add deionized water to the filter cake to make a slurry with a volume of 100mL, add formic acid dropwise for reduction by chemical reduction method, then filter and dry After washing until there is no chloride ion, the filter ca...
Embodiment 3
[0026] Put the activated carbon into a pulverizer and pulverize it into powder, sieve out 100-300 mesh activated carbon, add it to a nitric acid solution with a concentration of 3mol / L, and place it in an ultrasonic generator for ultrasonic immersion for 8 hours, then wash the activated carbon with deionized water to medium and filtered to obtain a pretreated activated carbon filter cake. With 30mL concentration of 0.01g / mL chloroplatinic acid solution, with concentration of 0.5mol / L Na 2 CO 3 The aqueous solution was adjusted to pH 2.5 and used as impregnation solution for catalyst preparation. Then add the activated carbon filter cake to the above impregnation solution, stir and impregnate at 75°C and ultrasonically for 2.5 hours, filter, add deionized water to the filter cake to make a slurry with a volume of 100mL, add formic acid dropwise for reduction by chemical reduction method, then filter and dry After washing until there is no chloride ion, the filter cake is tran...
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Abstract
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