Carbon Dioxide Decomposition Using Perovskite Metal Oxide SrFeO3-δ
- 주제(키워드) greenhouse gas , climate change , CO2 decomposition , CO2 utilization , SrFeOx
- 발행기관 고려대학교 대학원
- 지도교수 이기봉
- 발행년도 2020
- 학위수여년월 2020. 2
- 학위구분 석사
- 학과 대학원 화공생명공학과
- 원문페이지 68 p
- UCI I804:11009-000000127438
- DOI 10.23186/korea.000000127438.11009.0000947
- 본문언어 영어
- 제출원본 000046026202
초록/요약
Nowadays, climate change caused by global warming has become a worldwide problem with increasing greenhouse gas (GHG) emissions. Carbon capture and storage technologies for the capture of carbon dioxide (CO2) are mature, whereas CO2 storage and utilization technologies remain relatively immature. In this light, efficient CO2 decomposition results using a nonperovskite metal oxide, SrFeCo0.5Ox, in a continuous flow system have been reported. The CO2 decomposition efficiency achieved using SrFeCo0.5Ox was five times higher than that achieved using Ni-ferrite; however, this result was obtained under nonisothermal conditions. In this study, enhanced efficiency, reliability under isothermal conditions, and catalytic reproducibility through cyclic tests using SrFeO3- are reported. The isothermal results of SrFeO3- and CO2 and CO concentrations during the tests suggest that the most appropriate temperature for CO2 decomposition is 650-700 °C. Although SrFeO3- is a well-known material in different fields such as membranes, no studies have reported its use in CO2 decomposition applications. The efficiency of CO2 decomposition using SrFeO3- reached 90% and decomposition 80% lasted for around 170 min. Cyclic redox experimental data for realizing commercial applications are described. In addition, the stability of the catalyst is demonstrated through the structure and surface analysis of the catalyst after the experiment. These results are expected to contribute to the mitigation of GHG emissions.
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Abstract ⅰ
Abstract (in Korean; 국문요약) ⅱ
Contents iii
List of Figures ⅴ
List of Tables vii
Chapter 1. Introduction 1
Chapter 2. Theoretical background 4
2.1. ABO3 perovskite structure 4
2.2. ABO2.5 brownmillerite Structure 8
2.3. ABBOx nonperovskite Structure 10
2.4. CO2 decomposition mechanism 13
Chapter 3. Experimental details 17
3.1. Preparation of catalysts 17
3.2. Characterization of catalysts 19
3.3. CO2 decomposition in continuous flow reactor 20
3.4. Stability analysis 21
Chapter 4. Results and discussion 25
4.1. Characteristics of catalysts 25
4.2. Reduction behavior of the catalyst 28
4.2.1. TPR analysis 28
4.2.2. TGA analysis 31
4.2.3. In-situ XRD analysis 33
4.3. CO2 decomposition 35
4.3.1. Nonisothermal CO2 decomposition 35
4.3.2. Isothermal CO2 decomposition 38
4.3.3. Cyclic CO2 decomposition 42
4.4. Stability analysis 46
Chapter 5. Conclusion 50
References 51
