期刊
CATALYSTS
卷 11, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/catal11020192
关键词
molybdenum nitride; ammonia decomposition; hydrogen production; nitridation; topotactic transition
资金
- Chungbuk National University
- C1 Gas Refinery Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2015M3D3A1A01064899]
High surface area molybdenum nitride was prepared through temperature-programmed nitridation, with nitridation temperature being the key parameter affecting surface area. The catalyst with the highest degree of nitridation showed superior catalytic activity for ammonia decomposition due to its high surface area. Oxygen exposure resulted in surface area decrease, but H-2 treatment restored it to 90% of the initial value.
High surface area (>170 m(2) g(-1)) molybdenum nitride was prepared by the temperature-programmed nitridation of alpha-MoO3 with pure ammonia. The process was optimized by adjusting the experimental variables: the reaction temperature, heating rate, and molar flow rate of ammonia. The physicochemical properties of the as-formed molybdenum nitride were characterized by X-ray diffraction, N-2 sorption, transmission electron microscopy, temperature-programmed oxidation/reduction, and X-ray photoelectron spectroscopy. Of the experimental variables, the nitridation temperature was found to be the most critical parameter determining the surface area of the molybdenum nitride. When the prepared molybdenum nitride was exposed to air, the specific surface area rapidly decreased because of the partial oxidation of molybdenum nitride to molybdenum oxynitride. However, the surface area recovered to 90% the initial value after H-2 treatment. The catalyst with the highest degree of nitridation showed the best catalytic activity, superior to that of unmodified alpha-MoO3, for the decomposition of ammonia because of its high surface area.
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