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Spillover Phenomenon Identified Using Model Catalyst System
Researchers at KAIST have identified spillover phenomenon, which has remained controversial since its discovery in the early 1960s.
KAIST Department of Chemical and Biomolecular Engineering’s Professor Min-Gi Choi and his team has explained the "spillover phenomenon," using their own model catalyst system where platinum is selectively located within the amorphous aluminosilicate.
The research results were published on the 25th February online edition of Nature Communications.
Spillover refers to a phenomenon that occurs when hydrogen atoms that have been activated on the surface of metals, such as platinum, move to the surface of the catalyst. It was predicted that this phenomenon can be used to design a catalyst with high activity and stability, and thus has been actively studied over the last 50 years.
However, many cases of the known catalysts involved competing reactions on the exposed metal surface, which made it impossible to directly identify the presence and formation mechanism of spillover.
The catalysts developed by the researchers at KAIST used platinum nanoparticles covered with aluminosilicate. This only allowed the hydrogen molecules to pass through and has effectively blocked the competing reactions, enabling the research team to study the spillover phenomenon.
Through various catalyst structure and reactivity analysis, as well as computer modeling, the team has discovered that Brönsted acid sites present on the aluminosilicate plays a crucial role in spillover phenomenon.
In addition, the spillover-based hydrogenation catalyst proposed by the research team showed very high hydrogenation and dehydrogenation activity. The ability of the catalyst to significantly inhibit unwanted hydrogenolysis reaction during the petrochemical processes also suggested a large industrial potential.
Professor Min-Gi Choi said, “This particular catalyst, which can trigger the reaction only by spillover phenomenon, can be properly designed to exceed the capacity of the conventional metal catalysts. The future goal is to make a catalyst with much higher activity and selectivity.”
The research was conducted through funds subsidized by SK Innovation and Ministry of Science, ICT and Future Planning.
The senior research fellow of SK Innovation Seung-Hun Oh said, “SK Innovation will continue to develop a new commercial catalyst based on the technology from this research.”
Juh-Wan Lim and Hye-Yeong Shin led the research as joint first authors under supervision of Professor Min-Gi Choi and computer modeling works were conducted by KAIST EEWS (environment, energy, water, and sustainability) graduate school’s Professor Hyeong-Jun Kim.
2014.03.03 View 9344 -
Seung-Han Lee, a doctoral student in electrical engineering, receives the best paper award from ISQED 2014
Seung-Han
Lee, a doctoral candidate in the department of electrical engineering at KAIST,
received a Best Paper Award from the International Symposium on Quality
Electronic Design (ISQED), a high-profile international conference started in 2000 to promote innovation and quality in electronic and
engineering designs through inter- and multidisciplinary approaches. The
award ceremony will take place at the 2014 ISQED on March 3-5, 2014 at the Convention
Center in Santa Clara, CA, USA.
Professor
Chong-Min Kyung, an advisor to Seung-Han, expressed his excitement about his student's achievement.
“This is
the first time a Korean has ever received the best paper award at this academic
conference. It’s great news to our student as well as to KAIST.”
The topic
of Lee’s research paper was dynamic cache data management for minimizing the
energy consumption of three-dimensional multi-processor semiconductor chips.
2014.03.03 View 9169 -
KAIST held its 2014 Commencement Ceremony
The KAIST Commencement Ceremony for 2014 was held on Friday, 21st February, at Sports Complex, KAIST.
On this day, a total of 2,619 students
received their degrees. This included 499 doctorates, 1,220 masters, and 900 students with bachelor’s degrees. Since its establishment in 1971,
KAIST has produced 9,881 Ph.D., 25,161 MA and 13,693 BA,
which amounts to 48,735 scientific and engineering personnel.
The former Minister for Science and Technology
of the Republic of Korea, Dr. KunMo Chung, received an honorary doctorate for his effort in establishing the Korea Advanced Institute of Science (KAIS) to foster talented scientists and engineers, thus contributing to the significant growth
of Korea that has led it to stand as a scientifically advanced nation today.
The student graduating with summa cum laude was Jang-Geun
Kim from the Department of Biological Sciences. Mr. Kim received the Minister of Science, ICT and
Future Planning Award.
Mr. Kim said, “I am honored to receive the
award from the minister. I hope a lot of talented students will go onto science and
engineering field, so that Korea can earn a place among the technologically
elite countries.” Jang-Geun Kim will continue his
study of genomic medicine at KAIST graduate school.
President Steve Kang spoke
to the graduates:
“The whole nation has given their wholehearted support to KAIST so that students can study in a good environment. Please have
great aspirations and hopes, and continue to
broaden your knowledge and solve the challenges that humanity is facing today,
so our country and the world can advance.”
2014.02.27 View 8488 -
Professor Yong-Tak Im of Mechanical Engineering Appointed as President of Korea Institute of Machinery and Materials
Yong-Tak Im, Professor of the Department of
Mechanical Engineering at KAIST, was sworn in on February 25, 2014 as
the 16th president of the Korea Institute of Machinery and Materials
(KIMM), a leading government-funded research institution in Korea. KIMM was
established in 1976 to contribute to the development of
Korea through the invention of source technology and technology transfer in
mechanical engineering.
President Im graduated from Seoul National
University, obtaining degrees of Bachelor of Science and Master’s in mechanical
engineering. He later studied at the University of California in Berkeley and
received a doctoral degree in mechanical engineering.
After working as an assistant professor of
the Industrial and Systems Engineering at the Ohio State University,
President Im joined KAIST as a professor of mechanical engineering in 1989.
President Im took many important posts at
KAIST, including Dean of Planning Office, Dean of External Affairs and Public
Relations Office, and Associate Vice President of Special Projects and
Institutional Relations, making a great addition to the university’s endeavors for
globalization.
Among the awards President Im received was the
William Johnson Award in 2007 presented by the Advances in Materials and
Processing Technologies, the Research Achievement Award in 2010 by the Global
Congress on Manufacturing and Management, and the Presidential Award in 2012 by
the Republic of Korea. He was also elected as the vice president of the Korean
Society of Mechanical Engineers, the largest association of professionals in
the mechanical engineering field in Korea.
President Im is currently a professor at
POSCO, an internationally known Korean steel company, and a member of the
Korean Academy of Science and Technology and the National Academy of
Engineering of Korea, respectively.
President Im will serve KIMM for three
years until February 24, 2017.
2014.02.25 View 9362 -
Former Minister of Science and Technology, Dr. KunMo Chung, Awarded KAIST Honorary Doctorate
KAIST will confer an honorary doctorate on former minister of Science and Technology, Dr. KunMo Chung, at the 2014 KAIST graduation ceremony on Friday, February, 21.Dr. Chung presented the Survey Report for the Establishment of the Korea Advanced Institute of Science (KAIS) to the United States Agency for International Development (USAID) in 1969. This proposal for nurturing the advanced science technology elite and boost Korean industrial development became the foundation for KAIS, which is now known as KAIST.After passing the KAIS Foundation Law in 1970, Dr. Chung designed the faculty room, secured faculty members, and acquired a $6 million education loan from the USAID. Dr. Chung devoted himself to research and teaching. His first appointment was the position of assistant professor at the University of South Florida, followed by research professor positions at the Princeton Nuclear Fusion Research Center and MIT Nuclear Engineering, and an associate professor position in the Department of Electrophysics at the Polytechnic Institute of New York.When KAIS was founded on Feb. 16, 1971, 31-year-old Dr. KunMo Chung became the provost and a professor in the Electronic and Electrical Science Department where he made outstanding contributions to the development of science and technology in Korea.
2014.02.21 View 9381 -
Professor Hoi-Jun Yoo Appointed as the First Asian University Chairman of the ISSCC
Hoi-Jun Yoo, a professor of Electrical Engineering Department at KAIST, was chosen to be the first Asian University Chairman of the ISSCC (International Solid-State Circuits Conference) held in San Francisco, USA, from February 10 to 13, 2014. His term will last one year from April, 2014. Professor Yoo ranked tenth globally in thesis achievement over the 60-year history of the ISSCC. He ranked fourth globally over the last ten years and was the highest-ranked member from Asia over that time. He received an award for this remarkable achievement in 2012. ISSC is a world-renowned conference in the semiconductor field, where only 200 strictly selected papers are presented by semiconductor-related enterprises, research centers, and university representatives. Nicknamed the “The Olympics of the Semiconductor”, ISSCC runs for 4 days and hosts more than 3000 semiconductor engineers from around the world. It is most famous for the first CPU presentation by Intel and the first memory technology release of Samsung. Professor Yoo stated, “The Korean Semiconductor Engineering is leading the world’s technology instead of imitating it.” He aspires to devote himself to upgrading semiconductor engineering around the world.
2014.02.14 View 9120 -
Is it possible to identify rumors on SNS?
Rumors
sporadically spread with people with fewer followers in the centerResearched
over 100 rumors in the US from 2006 to 2009 Is it
possible to filter information on SNS such as Twitter and Facebook? A research
team led by Professor Mee-Young Cha from the Department of Cultural Technology
Graduate School at KAIST, Professor Kyo-Min Jung of Seoul National University,
Doctor Wei Chen and Yajun Wang of Microsoft Asia, has developed a technology
that can accurately filter out information on Twitter to 90% accuracy. The
research not only deduced a new mathematical model, network structure, and
linguistic characteristics on rumors from SNS data, but is also expected to
enhance the effort to make secure technology to regulate Internet rumors. The team
analysed the characteristics of rumors in over 100 widespread cases in the US
from 2006 to 2009 on Twitter. The team gathered data, which included a range of
areas such as politics, IT, health and celebrity gossips, and their analysis
could identify rumors to 90% accuracy. The filtering was more accurate in
rumors that included slanders or insults. The
research team identified three characteristics of the spread of rumors. Firstly,
rumors spread continuously. Normal news spreads widely once and is mentioned
rarely again on media, but rumors tend to continue for years. Secondly,
rumors spread through sporadic participation of random users with no
connections. Rumors start from people with fewer followers and spread to the
more popular. This phenomenon is often observed in rumors concerning
celebrities or politicians. Lastly,
rumors have unique linguistic characteristics. Rumors frequently include words
(such as “it may be true,” “although not certain, I think,” “although I cannot
fully remember”) related to psychological processes that question, deny, or
infer the reliability of the information. Professor
Cha said, “This research deduced not only a statistical and mathematical model
but also is an integrated research on social psychological theory on the
characteristics of rumors that attract great attention from the society based
on ample data.” The results
were made public in IEEE International Conference on Data Mining last December
in Texas, USA.
2014.02.03 View 9471 -
Man-Gi Paik Appointed as New President of KAIST Alumni Association
The KAIST Alumni Association selected Man-Gi Paik, a patent lawyer at the prestigious law firm of Kim & Chang in Korea, as its 22nd president. President Paik will hold the post from January 2014 to December 2015. After receiving a Masters of Science in Electrical Engineering at KAIST in 1976, President Paik attended the Wharton School of the University of Pennsylvania in the United States and obtained a Masters of Business Administration. He served as the president of the Korean Association of Intellectual Property Service and a board member of KAIST. He is currently an adjunct professor at the Graduate School of Intellectual Property, KAIST. President Paik said, “I’m honored to lead the KAIST alumni and look forward to creating many opportunities to work for the development of our alma mater.”
2014.02.03 View 8608 -
A Molecular Switch Controlling Self-Assembly of Protein Nanotubes Discovered
International collaborative research among South Korea, United States, and Israel research institutionsThe key to the treatment of cancer and brain disease mechanism The molecular switch that controls the self-assembly structure of the protein nanotubes, which plays crucial role in cell division and intracellular transport of materials, has been discovered. KAIST Bio and Brain Engineering Department’s Professor Myeong-Cheol Choi and Professor Chae-Yeon Song conducted the research, in collaboration with the University of California in Santa Barbara, U.S., and Hebrew University in Israel. The findings of the research were published in Nature Materials on the 19th. Microtubules are tube shaped and composed of protein that plays a key role in cell division, cytoskeleton, and intercellular material transport and is only 25nm in diameter (1/100,000 thickness of a human hair). Conventionally, cancer treatment focused on disrupting the formation of microtubules to suppress the division of cancer cells. In addition Alzheimer’s is known to be caused by the diminishing of structural integrity of microtubules responsible for intercellular material transport which leads to failure in signal transfer. The research team utilized synchrotron x-ray scattering and transmission electron microscope to analyze the self assemble structure of protein nanotubes to subnanometer accuracy. As a result, the microtubules were found to assemble into 25nm thickness tubules by stacking protein blocks 4 x 5 x 8nm in dimension. In the process, the research team discovered the molecular switch that controls the shape of these protein blocks. In addition the research team was successful in creating a new protein tube structure. Professor Choi commented that they were successful in introducing a new paradigm that suggests the possibility of controlling the complex biological functions of human’s biological system with the simple use of physical principles. He commented further that it is anticipated that the findings will allow for the application of bio nanotubes in engineering and that this is a small step in finding the mechanism behind cancer treatment and neural diseases.
2014.02.03 View 9789 -
Hyun-Sik Kim, KAIST doctoral student, receives Predoctoral Achievement Award from IEEE Solid-State Circuits Society
Hyun-Sik Kim, a Ph.D. student from the Department of Electrical Engineering, is scheduled to receive the “Predoctoral Achievement Award” from the Institute of Electrical and Electronics Engineers (IEEE) Solid-State Circuit Society (SSCS) at its 2014 annual conference to be held on February 9-13 in San Francisco, USA. Kim, the first Korean student receiving the award, will also be given a 1,000 USD honorarium.
Established in 1983, the Predoctoral Achievement Award has been given to a small number of promising graduate students, which is made on the basis of academic record and potential, quality of publications, and a graduate study program well matched to the charter of SSCS. Among the previous recipients were Professor Bernhard Boser of the University of California in Berkeley and Professor Michael Flynn of Michigan University.
Kim published 15 research papers in international journals and conferences, applied for 35 domestic and international patents, and received the best paper award in human technology from Samsun Electronics for three consecutive years.
Professor Kyu-Hyung Cho of Electrical Engineering is Kim's principal advisor.
2014.01.27 View 9676 -
Professor Suk-Bok Chang receives 14th Korea Science Award in the field of Chemistry
Professor Suk-Bok Chang from the Department of Chemistry at KAIST received the “2013 Korea Science Award” in chemistry hosted by the National Research Foundation and the Ministry of Science, ICT, and Future Planning, Republic of Korea.
The Korea Science Award is a presidential award of Korea, which was first established in 1987 to recognize research excellence in natural science. Three scientists are selected for the award in every other year.
Professor Chang primarily researches the catalyzing mechanism of carbon-hydrogen bonds in organic molecules. He has succeeded in making great progress in the field of organic chemistry especially in developing a new type of transition metal catalytic behavior that can be applied to low-reactivity compounds.
Hydrocarbons are abundant in nature, but its unreactive nature in ambient conditions makes it unsuitable as reactant for compound synthesis. In addition, the mechanism behind transition metal catalyzed carbon-hydrogen bond synthesis has not been proven sufficiently.
The prediction that fossil fuels will be depleted before the end of the century makes hydrocarbon synthesis an extremely important matter.
The need for an effective hydrocarbon synthesis method inspired Professor Chang to pursue research in the transition metal catalysis method and to develop a catalytic system that would allow efficient synthesis even in ambient conditions.
Professor Chang has been the lead researcher for the Institute for Basic Science’s “molecule catalysis reaction research team” since December 2012 and has been carrying out this research in KAIST.
2014.01.27 View 9549 -
Professor Sang-Min received an award for scholar of the year from the KAISTian of the Year 2013
KAIST nominates a “Scholar of the Year” each year and presents the award to the recipient at a New Year’s opening ceremony. For the year 2013, Professor Sang-Min Bae of the Industrial Design Department at KAIST was named “KAIST Scholar of 2013” and received the award on January 2, 2014.
Professor Bae has been recognized for his design achievement in 2013: D’Light, a kinetic lighting that employs a transformable lampshade using flexible honeycomb structure, became one of the finalists in the living room and bedroom category of the International Design Excellence Award 2013 and was selected one of the best 100 for the 2013 Good Design Award. Users can easily change the shape and light intensity of the lamp by simply pivoting the lampshade with its small handle.
Professor Bae has also actively pursued his own philanthrophic projects through design: he has given the profits from the sales of his designs including D’Light directly toward a scholarship for needy children.
The Scholar of the Year award is presented to a faculty member or researcher at KAIST who has contributed to the advancement of science and technology such as publication of articles with influential research outcomes, invention of breakthrough technology, implementation of outstanding research projects, and improvement of public life. Professor Bae is the 13 th winner of the KAIST award.
The Korea Times, a leading English language newspaper in Korea, published an article on this award. For the article, please visit http://www.koreatimes.co.kr/www/news/people/2014/01/178_149117.html .
2014.01.09 View 9795