Journal
CHINESE SCIENCE BULLETIN
Volume 59, Issue 31, Pages 3980-3986Publisher
SCIENCE PRESS
DOI: 10.1007/s11434-014-0495-z
Keywords
Hard template method; Mesoporous; High specific surface area; Spinel; Copper ferrite; NH3 selective oxidation
Categories
Funding
- National High Technology Research and Development Program of China [2013AA065900]
- National Natural Science Foundation of China [21177008, 21121064]
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Orderly mesoporous CuFe2O4 spinel-type mixed oxide with high specific surface area was prepared successfully by a hard-template method in which KIT-6 mesoporous silica was selected as the hard template. The KIT-6 hard template and CuFe2O4 samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, X-ray fluorescence, transmission electron microscopy, scanning electron microscopy, nitrogen physisorption, and hydrogen-temperature programmed reduction. The KIT-6 hard template had perfect crystallization and ordered mesoporous structure with a probable pore distribution of about 9.1 nm, large enough to be filled by the spinel precursor. The mesoporous CuFe2O4 spinel oxide synthesized inside the KIT-6 mesopores had a relatively small pore size (4.3 nm), orderly arrangement, and high specific area (194 m(2)/g). The catalytic activity of the mesoporous CuFe2O4 was tested for the selective oxidation of ammonia to nitrogen. The conversion of ammonia reached nearly 100 % at 300 A degrees C with a nitrogen selectivity as high as 96 %. The nitrogen selectivity remained high with increasing temperature and even maintained a value of 80 % at 600 A degrees C.
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