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Roles of the basic metals La, Ba, and Sr as additives in Al2O3-supported Pd-based three-way catalysts

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Title: Roles of the basic metals La, Ba, and Sr as additives in Al2O3-supported Pd-based three-way catalysts
Authors: Jing, Yuan Browse this author
Wang, Gang Browse this author
Ting, Kah Wei Browse this author
Maeno, Zen Browse this author →KAKEN DB
Oshima, Kazumasa Browse this author
Satokawa, Shigeo Browse this author
Nagaoka, Shuhei Browse this author
Shimizu, Ken-ichi Browse this author →KAKEN DB
Toyao, Takashi Browse this author →KAKEN DB
Keywords: Three-way catalysts
Basic metals
In situ/operando spectroscopy
X-ray absorption spectroscopy
Issue Date: 1-Aug-2021
Publisher: Elsevier
Journal Title: Journal of catalysis
Volume: 400
Start Page: 387
End Page: 396
Publisher DOI: 10.1016/j.jcat.2021.06.016
Abstract: Three-way catalytic converters are widely used to regulate emissions from gasoline-powered vehicles. Although significant effort over the past 40 years has resulted in the discovery of several metal additives that improve the thermal stability of three-way catalysts (TWCs), their effects on the actual catalytic process have not been studied systematically. The present work examines the roles of the typical basic metal additives La, Ba, and Sr in Pd-based TWC systems, using various spectroscopic and kinetic studies. Metallic Pd-0 species on Sr/Al2O3 and Ba/Al2O3 supports were found to be more electron-rich than those on pristine Al2O3, whereas those on La/Al2O3 were more electron-deficient. Consequently, Pd/La/Al2O3 showed a lessened CO poisoning effect during NO reduction reactions. Evaluations were performed using powdered catalysts as well as monolithic honeycomb catalysts under conditions simulating actual use. Pd/La/Al2O3 was observed to promote the catalytic reduction of NO most efficiently, while Pd/Ba/Al2O3 exhibited the highest activity for the oxidations of CO and C3H6. The present data suggest that the optimal metal additive for a Pd-based TWC will be determined by the specific application. The selection of such metals should take into account not only the stability but also the promotional effect during the exhaust purification process. (C) 2021 Elsevier Inc. All rights reserved.
Rights: © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鳥屋尾 隆

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