The effects of non-stoichiometry and dopants in nanocrystalline cerium oxide-based catalysts on redox reactions

Andreas Tschope; Jackie Y. Ying

doi:10.1016/0965-9773(95)00232-4

The effects of non-stoichiometry and dopants in nanocrystalline cerium oxide-based catalysts on redox reactions

Andreas Tschope^*, Jackie Y. Ying

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Nanocrystalline pure and doped non-stoichiometric CeO_2-x were synthesized by inert gas condensation. These materials were investigated as catalyst for redox reactions such as SO₂ reduction by CO, and CO oxidation by O₂. By controlling the stoichiometry of the oxide catalyst, the effect of bulk oxygen-deficiency on surface catalytic activity was revealed. Nanocrystalline CeO_t-x catalysts exhibited high catalytic activity, reversibility, and excellent resistance against deactivation by CO₂. Cu-doping of CeO_2-x was found to further promote catalytic activity. Nanocrystalline homogeneous CuCe mixed-metal oxide was synthesized by magnetron sputtering from a mixed metal target. Annealing at 650°C resulted in Cu segregation and formation of CuO clusters. Catalytic activity in CO oxidation by O₂ was not affected by this annealing treatment. STEM Cu elemental mapping illustrated that although some large CuO clusters were formed in thermal treatments, substantial Cu still remained highly dispersed.

Original language	English
Pages (from-to)	1005-1008
Number of pages	4
Journal	Nanostructured Materials
Volume	6
Issue number	5-8
DOIs	https://doi.org/10.1016/0965-9773(95)00232-4
State	Published - 1995
Externally published	Yes

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

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10.1016/0965-9773(95)00232-4

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title = "The effects of non-stoichiometry and dopants in nanocrystalline cerium oxide-based catalysts on redox reactions",

abstract = "Nanocrystalline pure and doped non-stoichiometric CeO2-x were synthesized by inert gas condensation. These materials were investigated as catalyst for redox reactions such as SO2 reduction by CO, and CO oxidation by O2. By controlling the stoichiometry of the oxide catalyst, the effect of bulk oxygen-deficiency on surface catalytic activity was revealed. Nanocrystalline CeOt-x catalysts exhibited high catalytic activity, reversibility, and excellent resistance against deactivation by CO2. Cu-doping of CeO2-x was found to further promote catalytic activity. Nanocrystalline homogeneous CuCe mixed-metal oxide was synthesized by magnetron sputtering from a mixed metal target. Annealing at 650°C resulted in Cu segregation and formation of CuO clusters. Catalytic activity in CO oxidation by O2 was not affected by this annealing treatment. STEM Cu elemental mapping illustrated that although some large CuO clusters were formed in thermal treatments, substantial Cu still remained highly dispersed.",

author = "Andreas Tschope and Ying, \{Jackie Y.\}",

year = "1995",

doi = "10.1016/0965-9773(95)00232-4",

language = "English",

volume = "6",

pages = "1005--1008",

journal = "Nanostructured Materials",

issn = "0965-9773",

publisher = "Pergamon Press Ltd.",

number = "5-8",

}

TY - JOUR

T1 - The effects of non-stoichiometry and dopants in nanocrystalline cerium oxide-based catalysts on redox reactions

AU - Tschope, Andreas

AU - Ying, Jackie Y.

PY - 1995

Y1 - 1995

N2 - Nanocrystalline pure and doped non-stoichiometric CeO2-x were synthesized by inert gas condensation. These materials were investigated as catalyst for redox reactions such as SO2 reduction by CO, and CO oxidation by O2. By controlling the stoichiometry of the oxide catalyst, the effect of bulk oxygen-deficiency on surface catalytic activity was revealed. Nanocrystalline CeOt-x catalysts exhibited high catalytic activity, reversibility, and excellent resistance against deactivation by CO2. Cu-doping of CeO2-x was found to further promote catalytic activity. Nanocrystalline homogeneous CuCe mixed-metal oxide was synthesized by magnetron sputtering from a mixed metal target. Annealing at 650°C resulted in Cu segregation and formation of CuO clusters. Catalytic activity in CO oxidation by O2 was not affected by this annealing treatment. STEM Cu elemental mapping illustrated that although some large CuO clusters were formed in thermal treatments, substantial Cu still remained highly dispersed.

AB - Nanocrystalline pure and doped non-stoichiometric CeO2-x were synthesized by inert gas condensation. These materials were investigated as catalyst for redox reactions such as SO2 reduction by CO, and CO oxidation by O2. By controlling the stoichiometry of the oxide catalyst, the effect of bulk oxygen-deficiency on surface catalytic activity was revealed. Nanocrystalline CeOt-x catalysts exhibited high catalytic activity, reversibility, and excellent resistance against deactivation by CO2. Cu-doping of CeO2-x was found to further promote catalytic activity. Nanocrystalline homogeneous CuCe mixed-metal oxide was synthesized by magnetron sputtering from a mixed metal target. Annealing at 650°C resulted in Cu segregation and formation of CuO clusters. Catalytic activity in CO oxidation by O2 was not affected by this annealing treatment. STEM Cu elemental mapping illustrated that although some large CuO clusters were formed in thermal treatments, substantial Cu still remained highly dispersed.

UR - https://www.scopus.com/pages/publications/0029238964

U2 - 10.1016/0965-9773(95)00232-4

DO - 10.1016/0965-9773(95)00232-4

M3 - Article

AN - SCOPUS:0029238964

SN - 0965-9773

VL - 6

SP - 1005

EP - 1008

JO - Nanostructured Materials

JF - Nanostructured Materials

IS - 5-8

ER -

The effects of non-stoichiometry and dopants in nanocrystalline cerium oxide-based catalysts on redox reactions

Abstract

ASJC Scopus subject areas

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