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Research progress on the interaction between plasma and catalyst of plasma radio frequency power supply:
As an effective molecular activation technology, low-temperature plasma has become increasingly close to cross-disciplinary research on catalysts. The combination of the two is mainly manifested in the following two manifestations: plasma-enhanced preparation of catalysts and catalyst-enhanced plasma chemical reactions. Plasma radio frequency power supply Plasma is a complex system composed of a variety of particles. Most of the catalysts are porous media that adsorb metal active components. When the catalyst is in contact with the plasma, it will have a certain influence on each other. The physical and chemical properties of the catalyst are changed to improve the activity and stability of the catalyst, and the plasma particle type and concentration are changed to promote the plasma chemical reaction.
After the plasma surface treatment of the catalyst, the activity of the catalyst is significantly increased. This article summarizes the interaction between plasma and catalyst in the plasma treatment process of plasma radio frequency power supply in detail. Plasma not only affects the particle size and shape of the active components and the acidity of the catalyst, but also has a certain degree of reducibility. On the other hand, the catalyst can also change the electron temperature, electron concentration and morphology of the plasma.
Plasma-enhanced preparation of catalysts uses plasma to perform surface treatment and modification on the catalyst before the conventional catalyst is calcined at a high temperature to improve the reaction activity of the catalyst. Catalysts play a pivotal role in chemical production, especially supported catalysts. Most chemical reactions require the participation of catalysts to proceed smoothly. In the catalytic reaction, the parameters such as the dispersion degree, chemical state, surface content and interaction with the carrier of the active components directly determine the activity, selectivity and stability of the catalyst.
Plasma surface treatment with plasma radio frequency power can change the valence state of metal active components and achieve catalyst reduction. The reduction of the metal on the catalyst surface is directly related to the high-energy electrons in the plasma. When the catalyst is put into the plasma, the moving speed of electrons is much higher than that of other heavy ions, so the electrons first reach the surface of the catalyst and are on the surface of the catalyst. Form a stable plasma sheath.
The electrons on the surface of the catalyst will recombine with the metal ions, thereby reducing the valence state of the metal or even being completely reduced to elemental metal. The chemical effect of plasma on the catalyst can change the valence state of active molecules on the surface of the catalyst, decompose the active components to produce new species, etc., so as to realize the surface modification of the catalyst. The plasma treatment of the plasma radio frequency power supply is a low-temperature decomposition process, which produces special metal clusters, which can enhance the interaction between the metal particles and the carrier and prevent the growth of the metal particles.
Using plasma treatment technology to improve the conventional impregnation method to prepare Ni/SrTiO3 catalyst. The experimental results confirm that the force between the formed metal clusters and the support is significantly enhanced. Under microscopic conditions, the repulsive force of the clusters can be observed to cause deformation and formation. The flat semi-ellipsoidal metal particles greatly improve the metal dispersibility of the catalyst, and the activity and stability of the catalyst are also significantly improved. The preparation of catalysts by plasma radio frequency power supply plasma technology has the advantages of simple operation, short process flow, low energy consumption, intuitive and easy control of the catalyst change process, and clean and pollution-free. In the future, the value potential of combining plasma and catalyst is great and needs further research to optimize it.
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