Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 281, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119471
Keywords
Flame spray pyrolysis; Single-atom catalysis; Thermal stability; CO oxidation; Methane combustion; Methane partial oxidation
Funding
- National University of Singapore Flagship Green Energy Program [R-279-000-553-646, R-279-000-553-731]
- Thailand Science Research and Innovation [BRG61]
- Ratchadapisek Sompoch Endowment Fund from Chulalongkorn University
- Ministry of Science and Technology in Taiwan [MOST 106-2113-M-007-025-MY3, MOST 107-3017-F-007-002]
- Frontier Research Center on Fundamental and Applied Sciences of Matters from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan
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Stable single-atom Pt catalysts supported on metal oxides were successfully prepared using flame spray pyrolysis, demonstrating excellent performance in high-temperature applications such as CO oxidation, methane combustion, and methane partial oxidation reactions. The formation of the tetragonal-monoclinic phase of ZrO2 by flame spray pyrolysis was found to enhance the catalytic activity of the single-atom Pt catalysts.
Obtaining stable single-atom catalysts (SACs) for high-temperature applications remains challenging due to the thermodynamically favourable metal sintering under harsh reaction conditions. Taking advantage of the high-temperature process conditions (> 1000 degrees C), we hereby report the preparation of thermally stable metal oxide-supported single-atom Pt catalysts by flame spray pyrolysis. Among the four common supports (Al2O3, SiO2, TiO2 and ZrO2) evaluated, single-atom Pt species were identified on Al2O3, TiO2 and ZrO2, among which ZrO2 was the best to stabilize atomically dispersed Pt. Compared to single-atom Pt catalysts prepared through the conventional impregnation method, samples synthesized by flame spray pyrolysis displayed excellent catalytic performance in CO oxidation, methane combustion and methane partial oxidation reactions. Characterization results revealed that flame spray pyrolysis favoured the formation of tetragonal-monoclinic phase of ZrO2 with improved redox property, thus leading to enhanced catalytic activity in high-temperature applications.
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