Author: 공과대학 교학팀

Heterogeneous Atomic Catalysts Overcoming the Limitations of Single-Atom Catalysts

Heterogeneous Atomic Catalysts Overcoming the Limitations of Single-Atom Catalysts   Prof. Hyunjoo Lee Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea   Recent advances in heterogeneous single-atom catalysts (SACs), which have isolated metal atoms dispersed on a support, have enabled more precise control of their surface metal atomic structure. SACs could reduce the amount of metals used for the surface reaction, and have often shown unique selectivity, which the corresponding nanoparticles would not have. However, the SACs typically have the limitations of low metal content, poor stability, oxidic electronic states, and the absence of ensemble sites. Here, I will introduce our recent efforts to overcome these limitations. For instance, highly durable SACs could be prepared by anchoring the metal atoms strongly on the defective support, metallic SACs were synthesized, and the ensemble catalysts, in which all the metal atoms are exposed at the surface like the SACs but the surface metal atoms are located nearby, were also successfully synthesized. We applied these heterogeneous atomic catalysts for automobile exhaust treatment (three way catalyst; TWC or diesel oxidation catalyst; DOC) or electrochemical reactions (formic acid oxidation; FAOR or oxygen reduction reaction; ORR). Heterogeneous atomic catalysts, whose structure is elaborately controlled and the surface reaction is better understood, can be a new paradigm with higher catalytic activity, selectivity, and durability, and used in industrial applications....

Gas-surface interactions in hypersonic flow

The desire to maintain thermal loads acting on re-entry vehicles within acceptable limits drives numerous activities pertaining to research and development of thermal-protection materials. Metallic thermal-protection materials with low mass densities and life-cycle costs as well as greater strength to withstand thermal loads have been widely employed...

2D van der Waals Electronics Toward Beyond CMOS Technology

2D Semiconductor Electronics Toward Beyond-CMOS Technology   Chul-Ho Lee1, 2 1KU-KIST Graduate School of Converging Science & Technology, 2Department of Integrative Energy Engineering, Korea University, Seoul 02841, Republic of Korea   Two-dimensional (2D) semiconductors such as transition metal dichalcogenides (TMDs) have emerged as a promising material for implementing beyond-CMOS...

SMR(소형모듈원전) 기술, 시장, 정책

Biological production of 3-hydroxypropionic acid from glycerol

Biological production of 3-hydroxypropionic acid from glycerol Prof. Sunghoon Park Department of Energy and Chemical Engineering, UNIST, Korea     3-Hydroxypropionic acid (3-HP) is an attractive platform chemical that has diverse applications in the chemical industries for paint, polymer, and consumer products. It can be synthesized chemically or biologically, but its commercial production has not been realized due to many technical challenges. We have studied a biological process for last ~15 years and succeeded in its efficient production on 100 L pilot-scale as represented by a high titer (>100 g/L), rate (>3 g/L/h), and yield (>0.95 mol/mol glycerol or >0.7 mol 3-HP carbon/mol substrate carbon). The work includes the selection of proper host microorganisms, optimization of gene expression, enzyme engineering, deletion of competing and 3-HP degradation pathways, optimization of energy and cofactor metabolisms, transport, adaptive evolution, etc. The study was collaborated with a paint company in Korea, and commercialization including process development and scale-up is now underway. This lecture summarizes and discusses our long journey with 3-HP....

2022학년도 2학기 에너지화학공학과 세미나 일정

2022학년도 2학기 에너지화학공학과 세미나 일정을 아래와 같이 안내드립니다. ※  수강생의 경우, 총 8회 중 6회 이상 출석해야 성적 인정 가능 (3회 이상 결석 시 미통과) ※ 문의: 공과대학 교학팀 윤진아 (052-217-1806 / jinayoon@unist.ac.kr / 108동 2층 U203-2호)     ...

Next-generation optoelectronics based on two-dimensional semiconductors

Next-generation optoelectronics based on two-dimensional semiconductors   Hyungjin Kim1*   1 Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea   With the innovation of technologies that will impact our daily life such as the internet of things (IoT), wearable health care systems, digitally extended...

Anisotropic Behaviors of Multi-Pass Caliber-Rolled Mg Alloy

Taekyung Lee(School of Mechanical Engineering, Pusan National University, Korea) Multi-pass caliber-rolled Mg alloys possess a unique basal texture with split basal poles that are in contrast to alloys subjected to other plastic deformation processes. The intrinsic nature of texture development allows anisotropic material properties, which are...