NDLI: New insights into the structure of a CeO2–ZrO2–Al2O3 composite and its influence on the performance of the supported Pd-only three-way catalyst

Content Provider	Royal Society of Chemistry (RSC)
Author	Lan, Li Gong, Maochu Chen, Yaoqiang Chen, Shanhu Cao, Yi
Copyright Year	2015
Abstract	In this work, a Ce0.5Zr0.5O2–Al2O3 (CZA) mixed oxide prepared by a coprecipitation method was deeply investigated and some new insights into the microstructure were obtained. The XRD, Raman, TEM and XPS results revealed that compositional inhomogeneity existed in fresh CZA; some Zr-rich species were in close contact with Al2O3, leading to the observed CZ nanocrystallites being richer in Ce, which was detrimental to the oxygen mobility, and consequently an undesirable redox property was obtained. During thermal treatment from 600 °C to 900 °C, atomic rearrangement took place, giving rise to the enhanced homogeneity of CZ solid solutions, accompanied by a weakened interaction between CZ and Al2O3, and a homogeneous CZ solid solution with a Ce/Zr ratio approaching the theoretical value of 1 was obtained for CZA treated at 900 °C. The TPR and OSC results indicated that the enhanced homogeneity of the CZ solid solution could facilitate the improvement of the redox property. However, further treatment at 1000 °C brought about the phase segregation of CZ, which led to significantly deteriorated textural and structural properties as well as a worse redox property. As a result, the catalyst Pd/CZA900 (CZA was treated at 900 °C) exhibited the best redox and catalytic performances, as well as excellent thermal stability.
Starting Page	4488
Ending Page	4500
Page Count	13
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	5
Issue Number	9
Journal	Catalysis Science & Technology
DOI	10.1039/c5cy00612k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Oxygen Zirconium Transmission electron microscopy TPR Redox Raman Solid solution OSC Coprecipitation
Content Type	Text
Resource Type	Article
Subject	Catalysis

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