Steam reforming of volatile fatty acids from organic wastes = 유기성 폐기물 유래 휘발성 유기산의 증기 개질 연구

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Hydrogen is becoming more an attractive alternative energy source due to the depletion of fossil fuel and the environmental issues. Fuel cell using hydrogen as fuel has higher fuel efficiency than conventional gasoline and diesel engines. It produces only water as a product without any pollutant emission. However, hydrogen is currently produced from nonrenewable sources such as natural gas and petroleum, which is accompanied by high $CO_2$ emissions. On the other hand, biomass can be used to produce hydrogen without a net change of $CO_2$ in the atmosphere and will play an important role as a renewable and sustainable hydrogen sources in the future. In this study, we consider the reforming of VFAs obtained from acid fermentation of food-wastes on the alumina-supported various catalysts. The steam reforming of a few different short chain carboxylic acids typically found in VFAs (e.g., acetic, propionic, butyric acid) were studied. The influence of reaction conditions such as temperature, oxygen to carbon ratio (O/C) and gas hourly space velocity (GHSV) were investigated. Temperature-programmed oxidation (TPO), X-ray diffraction (XRD) and pore size distribution were used to characterize coke deposition on the catalysts. Catalytic steam reforming of VFAs using alumina supported platinum catalysts was studied in a fixed-bed quartz reactor (20 mm O.D., 18 mm I.D., 400 mm height) at various temperatures between 300 and 600℃. The influence of reaction conditions such as temperature, oxygen to carbon ratio (O/C) and gas hourly space velocity (GHSV) was investigated. VFAs were successfully converted to COx and hydrogen. The hydrogen yield was up to 60% based on typical stoichiometry at 600℃ and GHSV of 25,000 $h^{-1}$. Temperature-programmed Oxidation (TPO), X-ray diffraction (XRD) and pore size distribution were used to characterize coke deposition. Any graphitic carbon on catalysts was not identified by XRD, which implies that amorphous coke formed in the small s...
Advisors
Chang, Ho-Namresearcher장호남researcherWoo, Seong-Ilresearcher우성일researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2009
Identifier
327736/325007  / 020055141
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2009. 8., [ vii, 112 p. ]

Keywords

reforming; organic aicd; biomass; catalyst; hydrogen; 개질; 유기산; 바이오매스; 촉매; 수소; reforming; organic aicd; biomass; catalyst; hydrogen; 개질; 유기산; 바이오매스; 촉매; 수소

URI
http://hdl.handle.net/10203/29071
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=327736&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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