Low loading palladium platinum core-shell structure catalyst and its preparation method and application

Abstract

The invention provides a low-loading palladium-platinum core-shell structure catalyst, which is prepared as follows: mix Pd precursor and propylene carbonate, stir and react for 1 to 5 hours in a hydrogen atmosphere of 1 to 4 MPa and room temperature, Obtain a solution containing Pd nanoparticles; add the Pt precursor to the obtained solution containing Pd nanoparticles, stir and react for 1 to 5 hours in a hydrogen atmosphere of 1 to 4 MPa at room temperature, and obtain a solution containing active components with a core-shell structure. ; The obtained solution containing core-shell structure active components and the carrier Al 2 O 3 Mix, stir for 4 to 48 hours, suction filtrate, and vacuum dry the filter cake to obtain the finished product; the raw materials of the synthesis method of the catalyst of the present invention are easy to obtain and can be reused, will not produce waste gas and waste water, have low environmental costs, and are easy to expand the scale for industrial production, so The prepared catalyst has higher activity than the catalyst obtained by the existing method, has good stability, and can be used in the catalytic oxidation reaction of toluene.

Description

(1) Technical field [0001] The invention belongs to the technical field of catalysts, in particular to a palladium-platinum core-shell structure catalyst (Pd@Pt / Al 2 o 3 type core-shell structure catalyst) and its preparation method, and its application in catalytic oxidation of toluene. (2) Background technology [0002] Volatile organic compounds (VOCs) are a class of major air pollutants and one of the main sources of PM2.5, which pose serious hazards to human health and ecology. In the newly promulgated "Code for Control of Indoor Environmental Pollution in Civil Buildings", the content of total volatile organic compounds (TVOC) in indoor air has become an important item to evaluate whether the indoor air quality of a room is qualified. The TVOC content specified in this standard is: Class I civil construction projects: 0.5mg / m3, Class II civil construction projects: 0.6mg / m3. Since interior decoration materials such as paints, adhesives, wallpapers and daily chemical...

AI Technical Summary

Problems solved by technology

These different types of structural designs have their own advantages and disadvantages, but the biggest problem is: firstly, the metal loading is relatively high, and the technology needs to be improved in order to reduce the preparation cost; secondly, most of the current domestic patents use single metal or platinum It can catalyze the complete oxidation of toluene with other metals as active components, and the two metals, palladium and platinum, actually have a good synergistic effect on the catalytic oxidation of toluene; finally, in the loading process of the two metals, the operation is more cumbersome, and A large amount of waste water and waste gas will also be generated during the synthesis process, which violates the principles of green chemistry

However, there is only Pt in the supported metal and the complete oxidation temperature is high, so the synergistic effect between metals has not been explored.

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