Real-time observation of the effect of oxygen storage materials on Pd-based three-way catalysts under ideal automobile exhaust conditions: an operando study

Autor:	Kazuki Tamai, Junya Ohyama, Saburo Hosokawa, Kosuke Beppu, Kazuo Kato, Tetsuya Shishido, Tsunehiro Tanaka, Hiroyuki Asakura, Kentaro Teramura
Rok vydání:	2021
Předmět:	Metal X-ray absorption spectroscopy Materials science Chemical engineering Absorption spectroscopy Oxygen storage visual_art visual_art.visual_art_medium Quadrupole mass analyzer Catalysis NOx Stoichiometry
Zdroj:	Catalysis Science & Technology. 11:6182-6190
ISSN:	2044-4761 2044-4753
DOI:	10.1039/d1cy00460c
Popis:	The dynamic behavior of Pd species and the CeO2 support of 1 wt% Pd/Al2O3 and Pd/CeO2 catalysts during three-way catalysis was examined in real time with operando multi-probe analysis using a micro gas chromatograph, a NOx meter, and a quadrupole mass spectrometer and time-resolved quick X-ray absorption spectroscopy (XAS) measurements. With additional ex situ NO pulse measurement, the results demonstrated the effect of oxygen storage materials under ideal automobile exhaust conditions, which can be summarized into a well-known anchoring effect of CeO2 on active metal species, an oxygen storage/release effect to maintain near stoichiometric conditions on the catalyst surface, NO reduction ability of CeO2 itself, and storage/release of carbonaceous species on/from CeO2.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::34a8a3e91523397fbfabda0983cd5005 https://doi.org/10.1039/d1cy00460c Zobrazit plný text záznamu