期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 238, 期 -, 页码 328-338出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.07.044
关键词
Dielectric barrier discharge; Pt/CeO2 catalysts; Plasma effect; Toluene oxidation
资金
- National Natural Science Foundation of China [51378218, 51578245]
- Fundamental Research Funds for the Central Universities
- Natural Science Foundation of Guangdong Province, China [2015B020236002, 2016A030311003]
- Science and Technology Program of Guangzhou [201510010164]
CeO2 nanorod was synthesized by a hydrothermal method and impregnated with Pt to synthesize Pt/CeO2 catalysts, which were modified by dielectric barrier discharge plasma. The modified CeO2 and Pt/CeO2 were characterized by XRD, STEM, N-2 adsorption/desorption, CO pulse chemisorption, XPS, H-2-TPR, O-2-TPD and UV-Raman spectroscopy techniques. After the plasma treatment, the T-90 value of (Pt/CeO2)-P catalyst decreased from 287 degrees C to 208 degrees C for toluene oxidation. This significantly changed activity of catalyst indicated that plasma has greatly impacted its performance. More and larger notches on surface and broken fragments were found from STEM analysis. In addition, smaller Pt particle size and higher dispersion of nanoparticles was found on (Pt/CeO2)-P, which was characterized by CO pulse chemisorption and TEM analysis. In addition, Pt/(CeO2-P) and (Pt/CeO2)-P possessed higher concentration of oxygen vacancies and Ce3+, which was observed by UV-Raman spectroscopy and XPS. Moreover, according to TPR results, the interaction between Pt and CeO2 was obviously strengthened, which led to a lower reduction temperature after plasma treatment. After plasma treatment, the (Pt/CeO2)-P presented the highest activity due to it possessing the highest TOFPt and TOFov, values of 9.88 x 10(-4) s(-1) and 9.49 x 10(-5) s(-1), respectively, and lower activation energies of 63.8kJ mol(-1). Furthermore, the toluene conversion of (Pt/CeO2)-P without significantly decreasing for working at least 50 h and under 9.6 vol% water vapor.
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