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Mo-Al 복합 산화물의 질화반응 처리된 촉매상에서 암모니아 촉매 분해반응
백서현 ( Seo-hyeon Baek ),윤경희 ( Kyunghee Youn ),신채호 ( Chae-ho Shin ) 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.1
Catalytic activity in ammonia decomposition reaction was studied on Mo-Al nitride obtained through temperature programmed nitridation of calcined Mo-Al mixed oxide prepared by varying the MoO<sub>3</sub> quantity in the range of 10-50 wt%. N<sub>2</sub> sorption analysis, X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS) and H<sub>2</sub>- temperature programmed reduction (H<sub>2</sub>-TPR), and transmission electron microscopy (TEM) to investigate the physicochemical properties of the prepared catalyst were performed. After calcination at 600 ℃, the XRD of Mo-Al oxide showed γ-Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub> phases, and the nitride after nitridation showed an amorphous form. The specific surface area after nitridation by topotactic transformation of MoO<sub>3</sub> to nitride was increased due to the formation of Mo nitride, and the Mo nitride was observed to be supported on γ-Al<sub>2</sub>O<sub>3</sub>. As for the catalytic activity in the ammonia decomposition reaction, 40 wt% MoO<sub>3</sub> showed the best activity, and as the nitridation time increases, the activity increased, and thus the activation energy decreased.