Journal
CATALYSTS
Volume 9, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/catal9010002
Keywords
non-thermal plasma; Pt/CeO2; oxygen vacancies; treatment Sequence
Categories
Funding
- General Program of National Natural Foundation of China [E080405]
- Fundamental Research Funds for the Central Universities
- Natural Science Foundation of Guangdong Province, China [2015B020236002, 2016A030311003]
- Guangzhou Science and Technology Program key projects [201510010164]
- National Natural Science Foundation of China [51578245]
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The performance of plasma-modified Pt/CeO2 for toluene catalytic oxidation was investigated. Pt/CeO2 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/CeO2 catalysts via the plasma treatment. It was found that plasma could promote the surface interaction between Pt and CeO2, 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/CeO2. The PC-PT sample showed the highest catalytic activity with T-100 at 205 degrees C. This work thus demonstrates that plasma in combined treatment sequences could assist surface interactions of catalysts for enhanced toluene catalytic oxidation.
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