By a News Reporter-Staff News Editor at Science Letter -- Researchers detail new data in Anions. According to news reporting from Storrs, Connecticut, by NewsRx journalists, research stated, "Manganese oxide octahedral molecular sieves (OMS) are important materials in environmental chemistry, electrochemistry, and heterogeneous catalysis. Cryptomelane and Ag-hollandite type manganese oxides (OMS-2) were synthesized by microwave-reflux and hydrothermal methods, respectively."
The news correspondents obtained a quote from the research from the University of Connecticut, "In this current study, silver doping of cryptomelane and Ag-hollandite was performed using both UV irradiation and KBH4 reduction methods. The formation process, particle size, crystallite size, crystal structure, and properties of these nanomaterials were characterized by powder X-ray diffraction, field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), and nitrogen sorption. Studies by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) showed that the produced OMS-2 have a nanofiber structure. The produced catalysts showed high activity, as high as 100% in the low-temperature CO oxidation at 140 degrees C. The catalysts doped with silver by KBH4 reduction method showed higher activities than other doping methods and template catalysts. In longtime stability tests, 80% CO conversion can be maintained for 26 h at 120 degrees C. The high activities, and stabilities of the Ag/K-OMS-2-KBH and Ag/Ag-OMS-2-KBH were attributed to the stable presence of Ag-0 and Ag+ species and the unique morphologies of the cryptomelane and Ag-hollandite nanofibers."
According to the news reporters, the research concluded: "CO oxidation is believed to follow the Mars-van Krevelen mechanism via the Ag+ - O2- - Mn4+ Ag-0 - Mn3+ + O-2 redox reaction."
For more information on this research see: Influence of silver on the catalytic properties of the cryptomelane and Ag-hollandite types manganese oxides OMS-2 in the low-temperature CO oxidation. Applied Catalysis A-General, 2013;462():64-74. Applied Catalysis A-General can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands (see also Anions).
Our news journalists report that additional information may be obtained by contacting M. Ozacar, University of Connecticut, Inst Mat Sci, Storrs, CT 06269, United States. Additional authors for this research include A.S. Poyraz, H.C. Genuino, C.H. Kuo, Y.T. Meng and S.L. Suib.
Keywords for this news article include: Storrs, Anions, Oxides, Connecticut, United States, Oxygen Compounds, North and Central America
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