News

News

Making new catalysts from unique metallic alloys

Data: 2020-01-22
Views: 228

Heusler alloys are magnetic materials made from three different metals that are not magnetic individually. The alloys are used broadly for their magnetic and thermoelectric properties, and their ability to regain their original shape after being deformed, known as shape memory. Investigations by Tohoku University's advanced materials scientist An-Pang Tsai and colleagues now show that these materials can also be fine-tuned to speed up chemical reactions. 


Heusler alloys have a typical composition of two parts metal X, one part metal Y, and one part metal Z (X2YZ). Each of the three come from a distinct region of the periodic table of elements. The original Heusler alloy, discovered in 1898, was Cu2MnAl, made from copper, manganese and aluminium. Many other combinations of metals were later found within the X2YZ arrangement.


While Tsai and his colleagues were investigating another type of structure, called quasicrystals, in the late 1980s, they created a series of new compounds by substituting existing elements with others from their same groups in the periodic table, as long as they had a similar atomic size. They later applied this concept to fabricate a large number of new Heusler alloys.


Tsai and his colleagues investigated the potential of 12 Heusler alloys as catalysts for propyne hydrogenation, a reaction that is used in the plastics industry, and for the oxidation of carbon monoxide, an important process for controlling pollution. They used relatively inexpensive elements to fabricate their alloys and found promising catalysts that were very selective for propyne hydrogenation. These involved a combination of cobalt for metal X, manganese or iron for metal Y, and gallium or germanium for metal Z. The team suspected that the alloys' catalytic properties could be fine-tuned for specific target reactions. They also found that metal X is the main active element in these reactions, while elements Y and Z are involved in the catalyst's activity, selectivity and durability. Some alloys, like one made from cobalt, titanium and tin, also showed promise for carbon monoxide oxidation.


Tsai and his colleagues believe materials informatics, which uses big data to discover new materials, could be particularly relevant for the discovery of new catalysts from Heusler alloys because of their well-defined arrangement.


Future research is expected to focus on incorporating nanoparticles containing catalytic elements into the crystal lattice of Heusler alloys. This would increase the surface area available for catalytic reactions, improving the material's catalytic activity.


'It was Professor Tsai's passion to play with elements and create new materials, with huge successes from early on,' says Alok Singh of Japan's National Institute for Materials Science. 'He has patented his recent works, and we hope to see them in operation in collaboration with industry. In the meantime, his colleagues will keep working on their development, with their progress inspiring further work.'


Via: https://phys.org

Note: Content may be edited for style and length.




News / Recommended news More
2020 - 07 - 22
Material scientists from NUST MISIS and the University of Western Australia have presented an innovative bioresorbable alloy based on magnesium, gallium and zinc. The material can be used for the manufacture of temporary implants in the treatment of fractures and the restoration of surgically removed areas of the bone, as well as in the treatment of osteoporosis, multiple myeloma, Paget's dise...
2020 - 07 - 16
PM China & CCEC China & IACE China 2020 gathers nearly 500 exhibitors under one roof to showcase advanced technologies, equipments and high-quality products such as high-performance materials, advanced ceramics products, new molding and processing technology, manufacturing technology of high precision parts, intelligent manufacturing technology and 3D printing technology.Acquiring latest i...
2020 - 06 - 17
A new study by researchers at Cranfield University in the UK finds that switching from aluminum to zinc alloys in the production of automotive parts could greatly enhance their longevity and sustainability.The study, conducted by Cranfield’s Sustainable Manufacturing Systems Center, evaluated the performance of three different alloys (aluminum-A380, magnesium-AZ91D and zinc-ZA8) considering overal...
2020 - 05 - 14
MIM is currently the most scientific near net shape forming technology for metal parts formation. It can flexibly adjust to various performance indexes and has been successfully applied to popular areas such as auto parts, 3C digital, medical equipment and tool locks. Hence, traditional molding technologies such as CNC fine processing, to some extent, are being replaced. Although the future of MIM...
Share:
Uniris Exhibition Shanghai Co., Ltd.
Shanghai Branch
Tel:4000 778 909
E-mail:irisexpo@163.com
  
Guangzhou Branch
Tel:020-8327 6389
E-mail:pmchina@unifair.com

CCEC CHINA official website
犀牛云提供企业云服务
Scan the QR code to visit the official website by phone