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Transformation of Bulk Pd to Pd Cations in Small-Pore CHA Zeolites Facilitated by NO

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Title: Transformation of Bulk Pd to Pd Cations in Small-Pore CHA Zeolites Facilitated by NO
Authors: Yasumura, Shunsaku Browse this author
Ide, Hajime Browse this author
Ueda, Taihei Browse this author
Jing, Yuan Browse this author
Liu, Chong Browse this author
Kon, Kenichi Browse this author
Toyao, Takashi Browse this author →KAKEN DB
Maeno, Zen Browse this author →KAKEN DB
Shimizu, Ken-ichi Browse this author →KAKEN DB
Issue Date: 13-Jan-2021
Publisher: American Chemical Society
Journal Title: JACS Au
Volume: 1
Issue: 2
Start Page: 201
End Page: 211
Publisher DOI: 10.1021/jacsau.0c00112
Abstract: Atomic dispersion of metal species has attracted attention as a unique phenomenon that affects adsorption properties and catalytic activities and that can be used to design so-called single atom materials. In this work, we describe atomic dispersion of bulk Pd into small pores of CHA zeolites. Under 4% NO flow at 600 属C, bulk Pd metal on the outside of CHA zeolites effectively disperses, affording Pd2+ cations on Al sites with concomitant formation of N2O, as revealed by microscopic and spectroscopic characterizations combined with mass spectroscopy. In the present method, even commercially available submicrosized Pd black can be used as a Pd source, and importantly, 4.1 wt % of atomic Pd2+ cations, which is the highest loading amount reported so far, can be introduced into CHA zeolites. The structural evolution of bulk Pd metal is also investigated by in situ X-ray absorption spectroscopy (XAS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), as well as ab initio thermodynamic analysis using density functional theory (DFT) calculations.
Type: article
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: 清水 研一

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