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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 吳嘉文(Kevin Chia-Wen Wu) | |
| dc.contributor.author | Zheng-Yen Wang | en |
| dc.contributor.author | 王正彥 | zh_TW |
| dc.date.accessioned | 2021-06-17T04:56:56Z | - |
| dc.date.available | 2018-08-06 | |
| dc.date.copyright | 2018-08-06 | |
| dc.date.issued | 2018 | |
| dc.date.submitted | 2018-07-27 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/71175 | - |
| dc.description.abstract | 我們開發出利用甲酸與碳搭載銠金屬觸媒 (Rh/C) 催化高效率液化木質素的系統。使用最適化後的混合溶劑溶劑環境 (乙醇/水 = 3/1, v/v)，可以在溫和條件 (250 oC, 3 h) 進行分解後，經由四氫呋喃 (THF) 溶劑萃取可得到89.3 wt% 的生質油 (bio-oil)；而酚類單體產率為2.89 wt%，其中烷基癒創木酚類 (alkyl guaiacols) 占單體產物的主要部分。甲酸與Rh/C在此系統中扮演的角色亦在本研究中進行詳細的討論，甲酸可以經由熱分解作為液相氫源使用，也發現同時具備酸催化的特性，可促進木質素結構中醚鍵的水解反應 (hydrolysis reaction)，進行初步液化分解。使用Rh/C 觸媒可促進烯基愈創木酚類 (alkenyl guaiacol) 轉換為烷基癒創木酚類(即氫化反應, hydrogenation)。此外，藉由本研究開發出的系統，可有效降低生質油的分子量 (Mn.= 467 g mol-1)，同時降低O/C比值 (0.61 to 0.26)，表示本系統具有增進木質素高值化的潛力。 | zh_TW |
| dc.description.abstract | We present an efficient liquefaction of alkali lignin in an ethanol-water mixed solvent system with the presence of formic acid and carbon-supported rhodium (i.e. Rh/C) catalyst. At an optimized reaction condition of 250 oC and 3 h, the result showed the maximum yield of 89.3 wt% of bio-oil. For monomers of bio-oil, the total yield of monomeric products was as high as 2.89 wt%, in which alkyl guaiacols accounts for the main proportion. We found that formic acid was not only used as a liquid-phase hydrogen source, but also could serve as an organic acid that catalyzes hydrolysis reaction of C-O-C ether bonds presenting in lignin during lignin liquefaction. The role of Rh/C is demonstrated for improving the conversion of alkenyl to alkyl guaiacols (i.e. hydrogenation reaction) during lignin liquefaction. In addition, smaller fragments (Mn.= 467 g mol-1) as well as lower O/C ratio (0.61 to 0.26) indicate that our system has a potential for upgrading the generated bio-oil. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T04:56:56Z (GMT). No. of bitstreams: 1 ntu-107-R05524006-1.pdf: 3450072 bytes, checksum: ba7fe5a5d8ec9c9c6d53c9ba167aa3bd (MD5) Previous issue date: 2018 | en |
| dc.description.tableofcontents | Chapter 1. Introduction 1
1.1. Lignocellulose in Biomass 1 1.2. Lignin Valorization 3 1.3. The Structure of Lignin 5 1.4. Lignin Liquefaction 7 Chapter 2. Literature Reviews 10 2.1. Reductive Process for Lignin Liquefaction 10 2.1.1. Metal catalyst 11 2.1.2. Solvent 14 2.1.3. Hydrogen Donor 17 2.1.4. Summary 20 2.2. Hydrolysis 23 Chapter 3. Objective 25 Chapter 4. Experimental 26 4.1. Chemicals and Materials 26 4.2. Equipment 27 4.3. Characterization of Catalysts 28 4.3.1. Transmission Electron Microscope (TEM) 28 4.3.2. TEM-Energy Dispersive Spectroscopy (EDS) 28 4.3.3. X-Ray Diffractometer (XRD) 28 4.4. Lignin Composition Analysis 29 4.4.1. Ash Content 29 4.4.2. Moisture Content 29 4.4.3. Inductively Coupled Plasma-Mass Spectrometer (ICP-MS) 30 4.5. Reaction Test 30 4.6. Extraction of the Depolymerized Product 31 4.7. Analysis of Depolymerized Product 31 4.7.1. Weight Percentage of Bio-oil 31 4.7.2. Gas Chromatography-Mass Spectrometer (GC-MS) 32 4.7.3. Gas Chromatograph-Flame Ionization Detector (GC-FID) 32 4.7.4. Gel Permeation Chromatography (GPC) 34 4.7.5. Elemental Analysis 34 4.7.6. Nuclear Magnetic Resonance Spectroscopy (NMR) 35 4.7.7. Fourier-Transform Infrared Spectroscopy (FTIR) 35 Chapter 5. Results and Discussion 37 5.1. Material Characterization 37 5.1.1. Rh/C Catalyst 37 5.1.2. Composition of Lignin 38 5.2. GC-MS Analysis 40 5.3. Reaction Optimization 40 5.3.1. Effect of Solvent 41 5.3.2. Catalytic System 45 5.3.3. Ratio of Ethanol-Water Mixed Solvent 47 5.3.4. Effect of Temperature 49 5.3.5. Effect of Reaction Time 51 5.3.6. Summary in Optimizing Condition 52 5.4. The Role of Formic Acid and Rh/C Catalyst 54 5.4.1. The Role of Formic Acid 54 5.4.2. The Role of Rh/C Catalyst 57 5.4.3. Two Dimensional (HSQC) NMR Analysis 62 5.4.4. FTIR Analysis 66 5.4.5. Summary 68 Chapter 6. Conclusions 69 Chapter 7. Future Work 71 Reference 72 Appendix 77 Curriculum Vitae 84 | |
| dc.language.iso | en | |
| dc.subject | 木質素 | zh_TW |
| dc.subject | 混合溶劑 | zh_TW |
| dc.subject | 甲酸 | zh_TW |
| dc.subject | 銠 | zh_TW |
| dc.subject | 液化 | zh_TW |
| dc.subject | rhodium | en |
| dc.subject | lignin | en |
| dc.subject | liquefaction | en |
| dc.subject | mixed solvents | en |
| dc.subject | formic acid | en |
| dc.title | 利用甲酸與碳搭載銠金屬及乙醇水混合液系統高效催化木質素液化解聚反應 | zh_TW |
| dc.title | Efficient Liquefaction of Lignin Using Formic Acid and Carbon-supported Rhodium Catalyst in an Ethanol/Water Mixed Solvent System | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 106-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 葉汀峰(Ting-Feng Yeh),柯淳涵(Chun-Han Ko),林曉洪(Sheau-Horng Lin),吉川琢也(Takuya Yoshikawa) | |
| dc.subject.keyword | 木質素,液化,銠,甲酸,混合溶劑, | zh_TW |
| dc.subject.keyword | lignin,liquefaction,rhodium,formic acid,mixed solvents, | en |
| dc.relation.page | 85 | |
| dc.identifier.doi | 10.6342/NTU201802033 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2018-07-27 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 化學工程學研究所 | zh_TW |
| 顯示於系所單位： | 化學工程學系 | |
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