Journal
JOURNAL OF CATALYSIS
Volume 263, Issue 1, Pages 123-133Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2009.02.001
Keywords
CeO2-ZrO2; Rh; Co-precipitation; Hydrothermal synthesis; Supercritical water; Oxygen storage/release capacity (OSC); Thermal stability; Three-way catalysis; NO plus CO reaction
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Funding
- Korea Energy Management Corporation
- Korea Science and Engineering Foundation [R01-2006-000-10765-0]
- Korean Ministry of Education, Science and Technology Development
- Korea Institute of Industrial Technology(KITECH) [2004-E-ID12-P-06] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [R01-2006-000-10765-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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CeO2-ZrO2 mixed oxides were prepared by continuous hydrothermal synthesis in supercritical water (supercritical synthesis) and co-precipitation method, respectively, and they were used as support for Rh catalyst. The activities of Rh-loaded CeO2-ZrO2 catalysts were investigated for catalytic reduction of NO by CO and their physicochemical properties were characterized with TPR, N-2 adsorption, O-2-up-take. XRD, Raman, SEM, AES, and H-2/CO chemisorption. Discussions were made on the differences in the catalytic performances between the two preparation methods of CeO2-ZrO2 supports in terms of reducibility, homogeneity, morphology, Rh dispersion, and thermal stability. Rh-loaded CeO2-ZrO2 prepared by supercritical synthesis showed superior performances for the catalytic reduction of NO by CO as well as better reducibility and higher thermal stability, compared with co-precipitation method, due to its sparsely-agglomerated morphology. CeO2-ZrO2 mixed oxide prepared by supercritical synthesis had more potential applications as catalyst support mainly due to its sparsely-agglomerated morphology and higher thermal stability. (C) 2009 Elsevier Inc. All rights reserved.
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