Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 18, Pages 9612-9620Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp5024845
Keywords
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Funding
- STCSM postdoctoral foundation [12R21413300]
- National Natural Science Foundation of China [51108258]
- Shanghai Municipal Education Commission [14ZZ097]
- Science and Technology Commission of Shanghai Municipality [11nm0502200]
- Dongguan Municipal Research Program for Colleges and Institutes [201210825000535]
- Shanghai First-Class Discipline Construction in Colleges and Universities
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CeO2 nanorods impregnated with 2.5 atom % of NiO (NiO/CeO2 nanorods) were successfully synthesized and examined as catalysts for the NH3-selective catalytic reduction (NH3-SCR) of nitric oxide (NO). The catalytic activity of NiO/CeO2 nanorods resulted in up to similar to 90% NO conversion at 250 degrees C, which is superior to that of pure CeO2 nanorods or NiO nanoparticles. Subsequently, extensive studies of the NiO/CeO2-catalyzed reduction of NO were conducted using X-ray photoelectron spectroscopy, hydrogen temperature-programmed reduction, temperature-programmed de-sorption, and density functional theory periodic calculations. Compared to that of the pure CeO2 nanorods, the results demonstrated that the NiO/CeO2 nanorods resulted in (i) a higher concentration of Ce3+ chemical species, (ii) a larger amount of active O-alpha, (iii) lower temperature reducibility, (iv) a lower amount of energy required for oxygen vacancy distortion, and (v) a significant adsorption of and strong interaction between NO and NH3 molecules. Our findings therefore elucidated considerable details of the structural properties of the NiO/CeO2 nanorods that were decisive for achieving a highly efficient conversion of NO by the NH3-SCR process at low temperatures.
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