(A) study on hydrogen production from the gasification of glucose and valine over activated charcoal supported Ni catalysts in supercritical water = 활성목탄에 담지한 니켈 촉매하에서 포도당 및 발린의 초임계수가스화에 의한 수소생산 연구

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In this work, supercritical water gasification (SCWG) method was studied using a continuous-flow reactor made of Hastelloy C-276 tubing as a means of hydrogen production from wet biomass without drying procedure. Glucose and valine was used as model compounds for carbohydrates (including cellulose and hemicellulose) and nitrogenous organic compounds (including protein), respectively. Dilute molasses-fermented waste as a whole biomass was also gasified using the SCWG system. Effect of major reaction parameters such as temperature, pressure, feed concentration, residence time, and catalyst on the gasification efficiencies and product distribution was investigated. Activated charcoal supported nickel (Ni/AC) and activated charcoal supported nickel-yttrium (Ni-Y/AC) catalysts were made and tested in the SCWG of the reactants. Other materials including Ni-Fe/AC, Ni-Co/AC, and AC were also prepared and tested as catalyst candidates. Activity and stability of the catalysts were discussed on the basis of product analysis and catalyst characterization. Product analysis was performed for the yields of $H_2$, CO, $CO_2$, $CH_4$, and light hydrocarbons in gaseous products and for the concentrations of reactant, COD, TOC, nitrogen-containing compounds (in case of valine gasification). Catalyst characterization was carried out for both fresh and spent catalysts by elemental analysis, $N_2$-adsorption, CO chemisorption, scanning electron microscopy (SEM), and energy dispersive x-ray spectroscopy (EDS) analysis methods. In SCWG of glucose without catalyst, gasification of glucose solution (0.3-1.2 M) in supercritical water was investigated at temperatures over 480-750℃ and pressure over 23-28 MPa with a reactor residence time of 10-50 s. The yield of hydrogen among gaseous products increased very sharply with increasing temperature above 660℃. On the other hand, the yield of carbon monoxide decreased with temperature most probably due to the role of water-gas shift reaction....
Advisors
Ihm, Son-Kiresearcher임선기researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2009
Identifier
309259/325007  / 020005241
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2009.2, [ xiv, 176 p. ]

Keywords

hydrogen production; gasification; supercritical water; Ni catalysts; glucose; valine; 수소 생산; 가스화; 초임계수; 니켈 촉매; 포도당; 발린; hydrogen production; gasification; supercritical water; Ni catalysts; glucose; valine; 수소 생산; 가스화; 초임계수; 니켈 촉매; 포도당; 발린

URI
http://hdl.handle.net/10203/29051
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=309259&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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