| 초록 |
Vanadium nitride (VN) is known for its excellent strength, thermal stability, water resistance, and high electrical and thermal conductivity. However, VN, which can be synthesized at a high temperature of 1000 ℃ or higher, is limited in its use as a heterogeneous catalyst because the specific surface area is reduced due to the sintering. Here, a study was conducted on the preparation and characterization of vanadium oxynitride by reduction and nitridation reaction. The vanadium compound prepared by changing the reaction temperature was compared with the ammonia decomposition reaction, and the physicochemical properties of the catalyst were investigated through XRD, N2-sorption, and TPR. It was confirmed that the XRD phase behavior of V2O5 reduction and nitridation was changed to V2O5→VOOH+V2O5→VOOH+VO2→V2O3→VNxOy→VN. In particular, the specific surface area of non-stoichiomeric vanadium oxide reacted at 330 ℃ showed the highest value. At a temperature higher than that, the compound approached the VN from VNxOy due to the acceleration of the nitridation reaction and the specific surface area continued to decrease due to sintering. |
