Plasma-Assisted Surface Interactions of Pt/CeO2 Catalyst for Enhanced Toluene Catalytic Oxidation

Abstract

The performance of plasma-modified Pt/CeO 2 for toluene catalytic oxidation was investigated. Pt/CeO 2 nanorods were prepared by wet impregnation and were modified by thermal (PC-T), plasma (PC-P), and combined (PC-TP and PC-PT) treatments. The modified catalysts were characterized by TEM (transmission electron microscope), BET (Brunauer-Emmett-Teller), H 2 -TPR, O 2 -TPD, XPS, UV-Raman, and OSC tests. The significant variation of the surface morphologies and surface oxygen defects could have contributed to the modification of the Pt/CeO 2 catalysts via the plasma treatment. It was found that plasma could promote the surface interaction between Pt and CeO 2 , resulting in the thermal stability of the catalyst. The Pt-Ce interaction was also conducive to an increase in the number of oxygen vacancies. Furthermore, PC-PT and PC-TP showed a significant difference in oxygen vacancy concentrations and catalytic activities, which illustrated that the treatment sequence (plasma and thermal treatment) affected the performance of Pt/CeO 2 . The PC-PT sample showed the highest catalytic activity with T 100 at 205 • C. This work thus demonstrates that plasma in combined treatment sequences could assist surface interactions of catalysts for enhanced toluene catalytic oxidation.

Plasma-Induced Catalyst Support Defects for the Photothermal Methanation of Carbon Dioxide

“…The plasma treatment affected the surface oxygen defects and Pt-Ce interaction. When thermally treating the catalyst after plasma treatment, more defects could be generated via greater hydrogen dissociation on the plasma-generated defect sites [ 48 ]. In our case, while the impact of plasma treatment was most prominent for (R-P)Ni/TiO 2 , the changes were not necessarily beneficial for enhancing photothermal CO 2 hydrogenation relative to (R)Ni/TiO 2 .…”

Construction of a Nanorod Structure‐Confined Pt@CeO2 Catalyst by an In‐Situ Encapsulation Strategy for Low‐Temperature Catalytic Oxidation of Toluene

“…[19] Furthermore, the highly dispersed Pt nanoparticles contribute to the formation of more surface areas and active centers, so the Pt nanoparticles confined in cerium oxide greatly promote its catalytic oxidation performance, [22,35] and the catalytic oxidation ability of toluene is significantly improved. [21] In conclusion, Ce-MOFs in-situ confined Pt NPs is a good choice, which retained the structural characteristics of MOFs. However, when the temperature at which the catalysts are prepared is changed, the morphology and size of the catalyst may be affected, and the interaction between the platinum species and the ceria support may also be affected, thereby affecting the catalytic performance of the catalyst.…”

“…More importantly, Ce‐MOFs, as a kind of carrier with high dispersion, can effectively confine precious metal ions evenly within the structure of the carrier, and this method can effectively improve the dispersion and stability of Pt NPs [19] . Furthermore, the highly dispersed Pt nanoparticles contribute to the formation of more surface areas and active centers, so the Pt nanoparticles confined in cerium oxide greatly promote its catalytic oxidation performance, [22,35] and the catalytic oxidation ability of toluene is significantly improved [21] . In conclusion, Ce‐MOFs in‐situ confined Pt NPs is a good choice, which retained the structural characteristics of MOFs.…”

“…[19] Yan and Li et al [20] designed an interesting Pt/CeO 2 catalyst by in-situ pyrolysis, and the catalyst had a strong PtÀ Ce interaction resulting in a large number of surface oxygen vacancy, which was crucial for improving the catalytic activity of toluene. In addition, Chen and his colleagues [21] prepared plasma-modified Pt/CeO 2 catalyst, and explored the reasons for the good catalytic oxidation performance of plasma-modified Pt/CeO 2 catalyst in toluene application through thermal, plasma and compound modification of the catalysts. Peng's research group [22] mainly studied the influence of morphology on the performance of Pt/CeO 2 catalysts, and proved the importance of surface oxygen vacancy concentration on toluene oxidation process.…”

Non-Thermal Plasma-Modified Ru-Sn-Ti Catalyst for Chlorinated Volatile Organic Compound Degradation

“…Non-thermal plasma (NTP) has been widely applied in surface modification [20][21][22][23], offering the advantages of room-temperature operation and non-equilibrium processes. In catalyst preparation, NTP could transform the precursor into oxide and simultaneously avoid the loss of activity caused by the high-temperature conditions in conventional calcination methods [24][25][26]. During the NTP process, the generated energetic clusters and active radicals are capable of dispersing precursors into smaller particles and inducing the active sites to higher oxidation states.…”