I D
× COMMENTARYCOVER STORYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More
Chemical Engineering MagazineChementator Briefs
PDH catalyst Last month, Clariant's Catalyst business (Munich, Germany; www.clariant.com)…
BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILESOLIDS PROCESSINGENGINEERING PRACTICEEQUIPMENT & SERVICESFOCUS
Focus on Pumps
Self-priming, liquid-ring pumps enable hygienic operation The CFS AS/ASH Series…
NEW PRODUCTS + Show More

Comment

These CeO2 nano-rods store a lot of O2 at low temperatures

By Tetsuo Satoh |

Automobile catalytic converters contain cerium-based co-catalysts to enhance the overall effectiveness of the converter by absorbing and releasing oxygen to convert CO into CO2. Existing emission control systems typically use CeO2-based materials, such as solid solutions of ceria and zirconia, which deliver good performance at high temperatures, but their oxygen storage capacity (OSC) deteriorates at temperatures below 300°C. To overcome this drawback, researchers from the group of Naoki Asao at Tohoku University (Sendai City, Japan; www.wpi-aimr.tohoku.ac.jp/asao_labo) have developed a process to fabricate fine nano-rods of CeO2 that have a high OSC at temperatures below 200°C. To make the nano-rods, a Ce-Al precursor is first “corroded” by a selective leaching process, which uses an alkaline solution under mild conditions to selectively leach away the Al and oxidize the Ce, followed by rapid quenching. The resulting CeO2 nano-rods have diameters of 5 to 7 nm and specific-surface areas of more than 200 m2/g. They exhibit an OSC of 156µmol O2/g at 200°C (81µmol O2/g at 100°C), which is five times greater than existing nano-cube systems at 200°C. The researchers are working to enhance the heat resistance of the developed…
Related Content
Nitrogen fixation under ambient conditions
The transition-metal-catalyzed reduction of nitrogen is an alternative to the traditional energy-intensive Haber-Bosch process for producing ammonia. In these reaction…

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Quadruple Sensor Lifetime with a Retractable Housing
Minimizing Explosion Risk Where Other Solutions Cannot
Minimizing Corrosion with Fast, Robust Gas Analysis
Lower Measurement Point Costs with Automatic pH Sensor Cleaning
Reduce the Risk of Corrosion in Fertilizer Production

View More

Live chat by BoldChat