By a News Reporter-Staff News Editor at Science Letter -- Current study results on Ethanol have been published. According to news reporting originating from Shanghai, People's Republic of China, by NewsRx correspondents, research stated, "The use of Ir as a reactive transition metal for O-2 activation to facilitate the selective oxidation of ethanol to acetaldehyde is explored. Co-impregnation of the chlorides of Au and Iron SiO2 followed by reduction afforded small bimetallic nanoparticles with a varying Au/Ir ratio."
Our news editors obtained a quote from the research from East China Normal University, "All of the nanoparticle catalysts including the monometallic Au and Ir end members have sizes in the range of 2-3 nm. Infrared spectroscopy of adsorbed CO on the reduced catalysts evidences the formation of alloyed nanoparticles. After oxidation at room temperature and at 200 degrees C, the Ir surface atoms are oxidized. No synergy between Au and Ir is observed in CO oxidation. Au lowers the CO oxidation activity of the pure Ir catalyst, suggesting the presence of surface Au atoms in the mildly oxidized Au-Ir bimetallic catalysts. At higher oxidation temperatures, viz. 350 and 500 degrees C, bulk oxidation of Jr occurs. While pure Jr nanoparticles sinter upon oxidation at elevated temperatures (350-500 degrees C), the presence of Au significantly retards this agglomeration of the nanopartides. At these elevated temperatures, an intimate mixture of reduced Au and IrOx is formed. The Au-Ir nanoparticles display enhanced activity in ethanol oxidation to acetaldehyde, outperforming their monometallic counterparts, with only minimum loss of C2-oxygenates selectivity compared to the pure Au nanoparticle catalyst. The maximum activity is obtained for a Au-Ir-3 composition."
According to the news editors, the research concluded: "The present results can be explained by a model involving an intimate contact between Au sites for (dissociative) ethanol adsorption and Jr sites covered by O adatoms which catalyze C-H bond cleavage to yield acetaldehyde."
For more information on this research see: Selective oxidation of ethanol to acetaldehyde by Au-Ir catalysts. Journal of Catalysis, 2013;305():135-145. Journal of Catalysis can be contacted at: Academic Press Inc Elsevier Science, 525 B St, Ste 1900, San Diego, CA 92101-4495, USA. (Elsevier - www.elsevier.com; Journal of Catalysis - www.elsevier.com/wps/product/cws_home/622858)
The news editors report that additional information may be obtained by contacting Y.J. Guan, E China Normal Univ, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, People's Republic of China (see also Ethanol).
Keywords for this news article include: Asia, Shanghai, Alcohols, Acetaldehyde, Nanoparticle, Ethanolamines, Nanotechnology, Emerging Technologies, People's Republic of China
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