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Hydrolysis of alginate into its monomers over sulfonated carbon catalyst derived from glucose : 술폰산이 작용기화된 글루코오즈 유래 카본 촉매를 이용한 알지네이트 분해반응
DC Field | Value | Language |
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dc.contributor.advisor | 김도희 | - |
dc.contributor.author | 반충현 | - |
dc.date.accessioned | 2017-07-19T05:54:28Z | - |
dc.date.available | 2017-07-19T05:54:28Z | - |
dc.date.issued | 2015-02 | - |
dc.identifier.other | 000000025455 | - |
dc.identifier.uri | https://hdl.handle.net/10371/129367 | - |
dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 화학생물공학부, 2015. 2. 김도희. | - |
dc.description.abstract | To mitigate the global pollution and reliance on petroleumbased fuels and chemicals, various types of biomass, such as agricultural crops, wood, and algae, have been investigated. Among these biomass feedstocks, algae is considered as a promising renewable resource due to its rapid growth, inedibility, and liginfree composition.
Alginate, the major constituent of algae, has found its wide applications in numerous fields. Similar to the structure of cellulose composed of glucoses via 1,4-glycosidic linkage, alginate consists of two hexuronic acids, β–D–mannuronic acid and α–L–guluronic acid by the ether bond. With the structural analogy, alginate can also be subjected to the current biorefinery technology, namely, hydrothermal conversion, to produce value-added organic compounds. To hydrolyze biomass effectively, employing of acid catalysts is essential. The use of homogeneous catalysts, however, causes critical issues, such as separation, purification, and neutralization. In this sense, developing solid acid catalysts easily separable and having a high catalytic activity has drawn interest worldwide. In this work, hydrothermal depolymerization of alginates into its two monomers over sugarderived solid acid catalysts was performed to investigate effects of catalyst properties, such as acid density, specific surface area, and thermal stability, on the yield of monomers. The catalysts bearing three functional groups, phenolic OH, COOH and SO3H, were synthesized by partial carbonization of Dglucose and sulfonation. It was found that the presence of strong brønsted acid sites(-SO3H) catalyzed hydrolysis of alginate, whereas weak acid sites(OH and COOH) had negligible effect on the reaction. The heterogeneous carbon catalyst shows a comparable activity with that of homogeneous catalysts such as sulfuric acid. The high activity is explained by high acid density and hydrophilic surface of the catalyst, despite low surface area. The sulfonated carbon shows the possibility of replacing homogeneous catalysts and could propose a green route to decompose alginate. | - |
dc.description.tableofcontents | Abstract
List of Tables List of Figures Chapter 1. Introduction 1.1. Background 1.2. Structure of Alginate 1.3. Objective Chapter 2. Experimental 2.1. Preparation of catalysts 2.1.1. Partial carbonization of glucose (Glu) 2.1.2. Sulfonation of carbons derived from glucose (Glu-SO3H) 2.2. Characterization of the acid-functionalized carbon catalysts 2.2.1. 13C cross-polarization/magic angle spinning nuclear magnetic resonance (CP/MAS NMR) 2.2.2. Diffuse reflectance infrared fourier transform spectroscopy (DRIFTs) 2.2.3. X-ray diffraction (XRD) 2.2.4. Elemental analysis 2.2.5. Back titration 2.2.6. N2 adsorption–desorption 2.2.7. Inductively coupled plasma (ICP–AES) 2.2.8. Thermogravimetric analysis (TGA) 2.2.9. Adsorption of alginate and glucuronic acid onto the prepared catalyst 2.2.10. Gel permeation chromatography (GPC) 2.2.11. High performance liquid chromatography (HPLC) 2.2.12. Reactor and hydrolysis conditions 2.2.13. Durability experiments of the sulfonated carbon catalyst Chapter 3. Result and discussion 3.1. Characteristics of the prepared carbon catalysts 3.2. Hydrolysis of alginate using sulfuric acid and the sulfonated carbon catalyst 3.3. Hydrolysis of alginate over commercial solid acid catalysts 3.4. Durability experiments of Glu-SO3H catalyst Chapter 4. Conclusion References 요약 (국문초록) | - |
dc.format | application/pdf | - |
dc.format.extent | 2572349 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | Alginate hydrolysis | - |
dc.subject | Mannuronic acid | - |
dc.subject | Guluronic acid | - |
dc.subject | Sulfonated carbon catalyst | - |
dc.subject.ddc | 660 | - |
dc.title | Hydrolysis of alginate into its monomers over sulfonated carbon catalyst derived from glucose | - |
dc.title.alternative | 술폰산이 작용기화된 글루코오즈 유래 카본 촉매를 이용한 알지네이트 분해반응 | - |
dc.type | Thesis | - |
dc.contributor.AlternativeAuthor | Chunghyeon Ban | - |
dc.description.degree | Master | - |
dc.citation.pages | 69 | - |
dc.contributor.affiliation | 공과대학 화학생물공학부 | - |
dc.date.awarded | 2015-02 | - |
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