(A) study on the characteristics in oxygen storage capacity of $CeO_2-ZrO_2$ mixed oxides and the characteristics of noble-metal loaded $CeO_2-ZrO_2$ catalysts for NO+CO reaction = 세리아-지르코니아 복합산화물의 산소저장특성 및 귀금속 담지 세리아-지르코니아 촉매의 NO+CO 반응 특성 연구

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$CeO_2-ZrO_2$ mixed oxide is widely used as oxygen storage material, for example, in the three-way catalysts for the clean up of automotive gases. The environmental regulation to reduce the automotive emissions has become more stringent increasingly in many countries such as USA, EU, and Korea. Recently, near-zero emissions and high durability are of urgent requirement and accordingly, the oxygen storage material ($CeO_2-ZrO_2$ mixed oxide) with advanced thermal stability has been of great interest for catalyst preparation. A number of different synthetic methods have been applied to prepare $CeO_2-ZrO_2$ and related mixed oxides: solid state synthesis, co-precipitation, high energy ball-milling, use of different additives/gelification agents such as hydrazine, oxalic acid, citric acid, sol-gel methods using alkoxide precursors, formation of aerogels by supercritical drying of hydrogels, spray pyrolysis, and co-impregnation method using the support with high surface area such as γ-$Al_2O_3$. Continuous hydrothermal synthesis in supercritical water (supercritical synthesis) is a method to prepare metal oxide nanoparticles rapidly and continuously using supercritical water as anti-solvent. Highly crystallized nanoparticles of homogeneous complex metal oxides as well as single metal oxides could be produced easily by the supercritical synthesis. It would be valuable to compare the physicochemical properties of $CeO_2-ZrO_2$ mixed oxides prepared by the supercritical synthesis and the other conventional methods. In this work, $CeO_2-ZrO_2$ mixed oxides were prepared by the new supercritical synthesis method and also by the conventional co-precipitation method. Physicochemical properties of the $CeO_2-ZrO_2$ mixed oxides were investigated and characterized with TPR, $N_2$ adsorption, $O_2$-uptake, XRD, and SEM. Discussions were made on the differences in the OSC characteristics and thermal stability of $CeO_2-ZrO_2$ mixed oxides between the two preparat...
Advisors
Ihm, Son-Kiresearcher임선기researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2009
Identifier
309267/325007  / 020045062
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2009.2, [ xiv, 163 p. ]

Keywords

CeO2-ZrO2; Oxygen Storage Capacity; Noble metal; NO+CO Reaction; continuous hydrothermal synthesis in supercritical water; 세리아-지르코니아; 산소저장능력; 귀금속; NO+CO 반응; 초임계 수열합성법; CeO2-ZrO2; Oxygen Storage Capacity; Noble metal; NO+CO Reaction; continuous hydrothermal synthesis in supercritical water; 세리아-지르코니아; 산소저장능력; 귀금속; NO+CO 반응; 초임계 수열합성법

URI
http://hdl.handle.net/10203/29059
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=309267&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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