Enhanced Preparation And Performance Research Of Supported Pd Catalyst By Atmospheric-pressure Cold Plasma

Supported Pd catalytic material is an important noble metal material, it exhibits high catalytic performance especially for the oxidation of toxic gas CO, which makes it become a hot research. However, since the palladium is a well-known rare metal, there still exists the key issue of seeking improvements for the traditional production method to obtain higher catalytic activity of Pd material, and introducing into a second metal to reduce the costs. Atmospheric cold plasma, as a green, efficient and secure preparation method, provides a new idea for the preparation of the catalytic materials.This article prepared the high activity Pd catalytic material via cold plasma and studied its structure and performance by XRD, TEM, XPS, TPR and BET characterizations. We chose the PdCl2 and Pd（NO3）2 as the Pd source, respectively, and addopted an equal volume impregnation method to load them on Al₂O₃. Then we found that when we used Pd（NO3）2 as the Pd source, smaller material particle and higher activity catalyst can be obtained. We also studied the Pd-Cu/Al₂O₃ which used Cu（NO3）2 as the copper source, and the effects of different metal impregnation order and the different loading ratio were investigated. The results showed that when the co-impregnation method and with a Pd:Cu supported ratio of 2%:2%, the bimetallic catalytic material showed the best activity. Through TEM, DRIFT and stability testing, we explored the catalytic mechanism. The results indicated that Pd-Cu/Al₂O₃-P bimetallic catalytic material showed higher activity because of its smaller particle size, higher alloying degree. And the Cu+ which generated by the accession of Cu enhanced the adsorption capacity of CO while desorption is also greatly improved.Finally, this article studied the performance of the single palladium metal catalytic materials supported with different active carriers like AC, FeO_x and P25. The results showed that different Pd samples had a large activity difference through DBD treatment, and the selection of carrier has a great impact on the performance of Pd catalysts.