화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.8, No.1, 1-11, January, 2002
Influence of Surface Composition on HDN Activities of Molybdenum Nitrides
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A series of molybdenum nitrides were prepared using temperature-programmed nitridation of Mo oxide precursors (MoO3) with pure NH3, and their adsorptive and catalytic properties were determined using the O2 chemisorption and pyridine HDN, respectively. While the bulk properties of Mo nitrides were investigated using x-ray diffraction (XRD), the surface electronic structures and compositions were determined by XPS. The XPS results showed that there are two different regions (nitride and oxides regions) present on the Mo nitride surface. For the Mo nitrides synthesized in the current study, the nitride fraction was a majority on the surface of the materials and averaged 75%. It was observed that the catalytic properties of Mo nitrides were strongly governed by the degree of nitridation. These results indicated that the high activity catalyst had the large surface composition of N/Moδ+, approximately unity. In the meantime, the nitrogen-deficient sites were found to be favorable to the O2 chemisorption. Based on the results from the correlations between the surface compositions and O2 uptakes or catalytic properties of the transition metal carbides arid nitrides, the concepts for the strong nitrogen-deficiency influence (SNDI) and strong carbon-deficiency influence (SCDI) processes were introduced for the catalytic applications of transition metal nitrides and carbides.
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