A kind of pt/c/ptfe type hydrophobic catalyst microsphere with controllable particle size and preparation method thereof

Abstract

The invention discloses Pt / C / PTFE (Polytetrafluoroethylenetype) type hydrophobic catalyst microspheres with the controllable particle diameterd and a preparation method of the Pt / C / PTFE type hydrophobic catalyst microspheres. The preparation method is characterized by comprising the following steps: respectively preparing a dispersed-phase solution and a continuous-phase solution, introducing the dispersed-phase solution into a capillary tube, cutting the continuous-phase solution by using the dispersed-phase solution to form dispersed-phase solution droplets with uniform sizes, controlling the particle diameters of the dispersed-phase solution droplets by changing the size of the capillary tube, the flow of the dispersed-phase solution, the flow of the continuous-phase solution or the viscosity of the continuous-phase solution, curing and sintering the dispersed-phase solution so as to obtain the Pt / C / PTFE type hydrophobic catalyst microspheres. The prepared microspheres have the advantages that the spherical degree is good, the size is uniform, the particle-diameter range is 150-1500mum, the dispersion coefficient CV is less than 5%, the hydrophobic characteristic and the porous characteristic are achieved, and simultaneously the adjustment and the control of the particle diameters of the Pt / C / PTFE type hydrophobic catalyst microspheres are also realized.

Description

technical field [0001] The invention relates to the field of preparation of hydrophobic catalysts, in particular to a Pt / C / PTFE type hydrophobic catalyst microsphere with controllable particle size for hydrogen-water liquid-phase catalytic exchange reaction and a preparation method thereof. Background technique [0002] With the development of the nuclear industry, nuclear facilities such as various types of reactors and nuclear fuel reprocessing plants will continuously produce a large amount of tritiated wastewater every year. According to relevant national policies and radiation protection regulations, these tritium-containing wastewater must be treated. On the one hand, the precious tritium can be recovered to achieve the purpose of resource reuse; on the other hand, the radiation of tritium can be reduced to prevent the pollution of natural water resources and protect the staff. and public safety. Judging from the research status at home and abroad in recent decades, u...

AI Technical Summary

Problems solved by technology

This method requires a high amount of PTFE, and the prepared hydrophobic catalyst has a small specific surface area, which is not conducive to the contact between the reactant and the active metal, and reduces the utilization rate of the precious metal Pt.

At the same time, the shape of the catalyst is difficult to control, and the size is not uniform enough, which leads to uneven packing in the catalytic column, and the packing density of the catalyst is not easy to increase, which reduces the efficiency of the catalytic reaction.

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