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Uniform synthesis of palladium species confined in a small-pore zeolite via full ion-exchange investigated by cryogenic electron microscopy

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Title
Uniform synthesis of palladium species confined in a small-pore zeolite via full ion-exchange investigated by cryogenic electron microscopy
Author(s)
Kim, Yongwoo; Jongbaek Sung; Sungsu Kang; Lee, Jaeha; Min-Ho Kang; Hwang, Sungha; Hayoung Park; Joodeok Kim; Younhwa Kim; Lee, Eunwon; Park, Gyeong-Su; Kim, Do Heui; Jungwon Park
Publication Date
2021-09-21
Journal
JOURNAL OF MATERIALS CHEMISTRY A, v.9, no.35, pp.19796 - 19806
Publisher
ROYAL SOC CHEMISTRY
Abstract
Finely dispersing noble metal species with high phase homogeneity in zeolites is crucial to develop an efficient catalyst. However, for palladium-impregnated zeolites, fully utilizing active palladium species in small-pore zeolites with high dispersion is challenging despite the establishment of a general synthetic approach of ion-exchange and subsequent thermal treatment to generate encapsulated nanoparticles. Herein, we achieve full dispersion of isolated Pd2+ ions in a small-pore SSZ-13 zeolite via a controlled ion-exchange process, and successfully generate uniformly dispersed nano-sized PdO clusters in SSZ-13 supported by mechanistic understanding of nanoparticle growth. Direct investigation via cryogenic electron microscopy and ultramicrotomy allows the successful artifact-free imaging of electron-beam-sensitive zeolite-based catalysts, and reveals that the formation of nano-sized PdO clusters during thermal treatment is governed by the rapid nucleation and suppressed particle growth in a confined space. Through fully utilizing active Pd species in SSZ-13 by controlled ion-exchange and rationalized thermal treatment, enhanced catalytic performances toward a passive NOx adsorber and CH4 combustion are achieved.
URI
https://pr.ibs.re.kr/handle/8788114/10972
DOI
10.1039/d1ta00468a
ISSN
2050-7488
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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