NEWS & INFORMATION FOR CHEMICAL ENGINEERS, Vol. 31, No. 1, 2013 … 135 Korean Journal of Chemical Engineering,
Vol.29, No.12, 1657-1665, 2012
Upgrading of biofuel by the catalytic deoxygenation of biomass Ko CH, Park SH, Jeon JK, Suh DJ, Jeong KE, Park YK
Abstract - Biomass can be used to produce biofuels, such as bio-oil and bio-diesel, by a range of methods. Biofuels, however, have a high oxygen content, which deteriorates the biofuel quality. Therefore, the upgrading of biofuels via catalytic deoxygenation is necessary. This paper reviews the recent advances of the catalytic deoxygenation of biomass.
Catalytic cracking of bio-oil is a promising method to enhance the quality of bio-oil. Microporous zeolites, mesoporous zeolites and metal oxide catalysts have been investigated for the catalytic cracking of biomass. On the other hand, it is important to develop methods to reduce catalyst coking and enhance the lifetime of the catalyst. In addition, an examination of the effects of the process parameters is very important for optimizing the composition of the product. The catalytic upgrading of triglycerides to hydrocarbon-based fuels is carried out in two ways. Hydrodeoxygenation (HDO) was introduced to remove oxygen atoms from the triglycerides in the form of H
2O by hydrogenation. HDO produced hydrogenated biodiesel because the catalysts and process were based mainly on well-established technology, hydrodesulfurization. Many refineries and companies have attempted to develop and commercialize the HDO process. On the other hand, the consumption of huge amounts of hydrogen is a major problem hindering the wide-spread use of HDO process. To solve the hydrogen problem, deoxygenation with the minimum use of hydrogen was recently proposed.
Precious metal-based catalysts showed reasonable activity for the deoxygenation of reagent-grade fatty acids with a batch- mode reaction. On the other hand, the continuous production of hydrocarbon in a fixed-bed showed that the initial catalytic activity decreases gradually due to coke deposition. The catalytic activity for deoxygenation needs to be maintained to achieve the widespread production of hydrocarbon-based fuels with a biological origin.
Korean Journal of Chemical Engineering, Vol.29, No.12, 1666-1669, 2012
Use of biologically designed gold nanowire for biosensor application Shin SH, Kim GY, Shim J, Kim J, Hur HG, Lee DJ, Song JI, Moon SH
Abstract - A highly sensitive tyrosinase (TYR)-based amperometric biosensor is prepared using biologically designed gold nanowires (AuNWs) for pesticide detection. The AuNWs were synthesized by dodecapeptide Midas-11 and were modified with the formation of self-assembled monolayer (SAM), followed by covalent binding with TYR. The prepared TYR- AuNWs-SPCE (screen printed carbon electrode) was compared with bare, AuNWs-, modified-AuNWs-SPCE by the measurement of cyclic voltammetry. The quantitative relationship between the inhibition percentage and the pesticide concentration at the TYR-AuNWs-SPCE was obtained by measuring the current response in various concentrations of pesticides. The reasonable detection range of parathion was determined to be 0.1 ppt through 10 ppb (R
2=0.990) with 0.087 ppt of detection limits. The higher sensitivity and wider detection range of the TYR-based biosensor was achieved by the use of biologically synthesized AuNWs.
Korean Journal of Chemical Engineering, Vol.30, No.1, 1-10, 2013
Recent progress in hydrogenase and its biotechnological application for viable hydrogen technology
Kim JYH, Cha HJ
Abstract - Despite increasing interest in hydrogen (H
2) as an alternative energy carrier, the current production of H
2still
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136 … NICE, 제31권 제1호, 2013
depends on fossil fuels. Biotechnological hydrogen production can provide a more sustainable way to generate H
2. Hydrogenases are key enzymes involved in hydrogen metabolism of microorganisms with roles of H
2oxidation or evolution. They have potential applications in H
2production in vivo, in vitro and fuel cell. Important achievements have been made over the past decade in our understanding of hydrogenase and its biotechnological application as catalyst for H
2production and fuel cell. This review summarizes recent progress in the study of hydrogenases, involving strategies for biosynthesis, maturation process, isolation of novel hydrogenases, heterologous expression system, structural feature of oxygen (O
2)-tolerant hydrogenases, and biotechnological applications for viable H
2technology.
Korean Journal of Chemical Engineering, Vol.30, No.1, 62-66, 2013
Photocatalytic effects of plasma-heated TiO
2-xparticles under visible light irradiation Chae YK, Park JW, Mori S, Suzuki M
Abstract - The photocatalytic characteristics of partially reduced TiO
2(TiO
2-x) by plasma treatment and plasma-heated treatment were investigated in the visible-light region. For the visible-light photocatalytic activity of TiO
2-x, plasmaheated treatment shows stronger than plasma treatment significantly. The TiO
2-xby plasma-heated treatment shows broader red- shifted absorption bands than one by plasma treatment in the visible-light region. The surface color of TiO
2-xby plasma treatment and plasma-heated treatment changed from white to sky blue, and to navy, respectively. After exposure to air, the surface color of TiO
2-xchanged from sky blue to white for plasma treatment and from navy to beige for plasma-heated treatment.
Korean Journal of Chemical Engineering, Vol.29, No.12, 1802-1805, 2012
Formation of nanoporous nickel oxides for supercapacitors prepared by electrodeposition with hydrogen evolution reaction and electrochemical dealloying
Jeong MG, Zhuo K, Cherevko S, Chung CH
Abstract - Highly nanoporous nickel oxide electrodes were obtained by electrodeposition accompanied by hydrogen evolution reaction and the selective electrochemical dealloying of copper from Ni-(Cu) porous foam. The nanoporous nickel oxide electrodes consequently have numerous dendritic morphologies composed of nanopores with 20-30 nm diameters. The specific capacitances were 428 F g
-1for as-deposited Ni-(Cu) foam electrode and 1,305 F g
-1for nanoporous nickel-oxide electrode after dealloying process, respectively. This indicates increased surface area by dealloying process leads to innovative increase of specific capacitance.
Korean Journal of Chemical Engineering, Vol.29, No.12, 1776-1781, 2012
Synthesis and characterization of nanocomposite MCM-48-PEHA-DEA and its application as CO
2adsorbent
Anbia M, Hoseini V, Mandegarzad S
Abstract - Three nanocomposites containing MCM-48-35PEHA-15DEA (35 and 15 as weight percent of amine addition),
MCM-48-30PEHA-20DEA and MCM-48-25PEHA-25DEA of mesoporous silica MCM-48 modified by the mixture of
pentaethylenehexamine (PEHA) and diethanolamine (DEA) have been synthesized and used to study the adsorption of
carbon dioxide (CO
2). They are characterized by low angle x-ray diffraction (XRD), Fourier transform infrared (FT-IR) and
Brunauer-Emmet-Teller (BET) analysis. MCM-48-35PEHA-15DEA (as optimized adsorbent) shows CO
2adsorption
capacity of 0.51 (m·mol CO
2/g-adsorbent) at 1 bar and 298 K, much higher than CO
2adsorption capacity on
polyethyleneimine, pyrrolidinepropyl and polymerized aminopropyl loaded MCM-48.
NEWS & INFORMATION FOR CHEMICAL ENGINEERS, Vol. 31, No. 1, 2013 … 137 Korean Chemical Engineering Research,
Vol.50, No.6, 980-987, 2012
시스템 해석에 기초한 하수관망 오염 매카니즘과 관망 모니터링 및 이상진단
