Navigation Links
Tufts University Prof. Maria Flytzani-Stephanopoulos named as AAAS Fellow

MEDFORD/SOMERVILLE, Mass. Maria Flytzani-Stephanopoulos of Tufts University's School of Engineering has been selected as an AAAS Fellow for distinguished contributions to the field of catalysis, particularly for new insights in oxidation reactions on nanoscale metal oxides in fuel conversion and pollutant processes.

Election as Fellow is an honor bestowed upon AAS members by their peers. Flytzani-Stephanopoulos, professor in the Department of Chemical and Environmental Engineering, was one of 486 members named as a Fellow.

Flytzani-Stephanopoulos's research group has been active in designing catalysts with a reduced amount of precious metals used to generate high-grade hydrogen for fuel cells. The water-gas shift reaction, in which carbon monoxide is removed from the fuel cell by reacting with water to produce carbon dioxide and hydrogen, is a key step in fuel processing hydrogen. Catalysts, such as metal oxides prepared with precious metals like platinum, are used to lower the reaction temperature and increase the production of hydrogen.

The Tufts group was first to demonstrate that catalysts prepared with atomic-level dispersions of gold or platinum in oxide supports, such as cerium oxide or iron oxide, show the highest activity for the water-gas shift reaction. Adding more metal to form nanoparticles on the support oxide does not improve the activity; it simply wastes the precious metal. Highly active and stable catalysts are required for integration in fuel cell systems. To improve the stability of the precious metal with temperature and length of operating time, the Tufts group was first to show that adding small amounts of gaseous oxygen could have the desired structural effect of keeping gold fully dispersed and available to react.

Professor Stephanopoulos and her research group are presently investigating ways to further improve the activity of doped metal oxides by identifying which oxide structure binds gold stronger. The researchers synthesize single crystal oxides at the nanoscale with specific shapes (rods, cubes, polyhedra) and crystal faces; dope these with various metals and study them as catalysts for alcohol steam reforming, the water-gas shift reaction, hydrocarbon oxidation and other reactions, including sulfur removal reactions. The aim is to benefit fuel processing overall at all scalesfrom providing power to a laptop or cell phone to increasing energy from a power plantand for any fuel gas stream, including coal-derived gas.

"There are always new things to discover in materials science which impact catalysis," said Flytzani-Stephanopoulos. "With new methods for the synthesis of nanomaterials rich in defects, and with proper doping of these structures with a variety of metals, it's like starting from scratch again to understand their chemistry and tailor their catalytic properties to optimize both their activity and selectivity for a large number of reactions of interest to clean and sustainable energy production."

This year 486 members were selected as Fellows because of their scientifically or socially distinguished efforts to advance science or its applications. This year's AAAS Fellows will be announced in the AAAS News & Notes section of the journal Science on 19 December 2008. New Fellows will be honored during the 2009 AAAS Annual Meeting in Chicago on February 14.


Contact: Alex Reid
Tufts University

Related biology news :

1. Tufts University biologists link Huntingtons disease to health benefits in young
2. Tufts to develop morphing chemical robots
3. A study by the MUHC and McGill University opens a new door to understanding cancer
4. University of Pennsylvania researchers develop formula to gauge risk of disease clusters
5. University of Oregon researcher finds that on waters surface, nitric acid is not so tough
6. Bioengineers at University of Pennsylvania devise nanoscale system to measure cellular forces
7. Binghamton University researchers investigate evolving malaria resistance
8. Antioxidant to retard wrinkles discovered by Hebrew University researcher
9. Society for General Microbiology 161st Meeting, University of Edinburgh
10. Boston University biomedical engineers find chink in bacterias armor
11. KAUST and American University in Cairo to collaborate on research and academic development
Post Your Comments:
(Date:11/17/2015)... 2015 Paris , ... --> Paris , qui s,est tenu ... le leader de l,innovation biométrique, a inventé le premier ... empreintes sur la même surface de balayage. Jusqu,ici, deux ... pour les empreintes digitales. Désormais, un seul scanner est ...
(Date:11/12/2015)... -- A golden retriever that stayed healthy despite having the ... a new lead for treating this muscle-wasting disorder, report ... MIT and Harvard and the University of São Paolo ... Cell, pinpoints a protective gene that boosts muscle ... Boston Children,s lab of Lou Kunkel , PhD, ...
(Date:11/10/2015)... , Nov. 10, 2015  In ... on the basis of product, type, application, ... included in this report are consumables, services, ... report are safety biomarkers, efficacy biomarkers, and ... this report are diagnostics development, drug discovery ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... /PRNewswire/ - Aeterna Zentaris Inc. (NASDAQ:  AEZS; TSX: AEZ) ... remain fundamentally strong and highlights the following developments: ... DSMB recommendation to continue the ZoptEC Phase 3 ... final interim efficacy and safety data , ... with heavily pretreated castration- and Taxane-resistant prostate cancer ...
(Date:11/24/2015)... 2015  Asia-Pacific (APAC) holds the third-largest share ... The trend of outsourcing to low-cost locations is ... volume share for the region in the short ... in the CRO industry will improve. ... ), finds that the market earned revenues ...
(Date:11/24/2015)... ... November 24, 2015 , ... ... But unless it is bound to proteins, copper is also toxic to cells. ... at Worcester Polytechnic Institute (WPI) will conduct a systematic study of copper in ...
(Date:11/24/2015)... ... 2015 , ... This fall, global software solutions leader SAP and AdVenture Capital ... and pitch their BIG ideas to improve health and wellness in their schools. , ... win the title of SAP's Teen Innovator, an all-expenses paid trip to Super Bowl ...
Breaking Biology Technology: