Mechanism of Soot Oxidation over CeO2–ZrO2 under O2 Flow

Autor:	Hitoshi Kubo, Yusuke Ohshima, Osamu Nakagoe, Noriko Yoshizawa, Yamashita Takeshi, N. Saitoh, Shuji Tanabe, Kikuhara Shunji
Rok vydání:	2018
Předmět:	Chemistry chemistry.chemical_element Autoignition temperature General Chemistry Reaction intermediate medicine.disease_cause complex mixtures Oxygen Soot Adsorption Chemical engineering Transmission electron microscopy medicine Contact area Thermal analysis
Zdroj:	Bulletin of the Chemical Society of Japan. 91:437-443
ISSN:	1348-0634 0009-2673
DOI:	10.1246/bcsj.20170270
Popis:	Soot oxidation over CeO2–ZrO2 (CZ) has been studied herein. The soot-CZ mixtures were observed under different contact conditions using transmission electron microscopy (TEM) and evaluated using thermogravimetric-differential thermal analysis (TG-DTA). These results indicate that the soot ignition temperature depends on the soot/CZ contact degree, and the soot oxidation rate depends on the soot/CZ contact area. The TEM observation of soot-CZ mixture quenched at T50 (50% soot conversion) indicates that soot oxidation occurs only at the soot/CZ interface. Furthermore, the soot oxidation under 18O2 flow and under He flow suggests that CZ lattice oxygen is a more active oxygen species than the adsorbed oxygen on the CZ. The CZ lattice oxygen mainly oxidizes soot; however, the adsorbed oxygen on the CZ surface does not oxidize soot at lower temperatures. Thus, the adsorbed oxygen oxidizes the reaction intermediates such as adsorbed CO on the CZ surface, which shows that CZ lattice is more active than the adsor...
Databáze:	OpenAIRE
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