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니오비움 함유 복합 금속산화물 촉매의 선택산화반응에 관한 연구
김영철,김형주,문동주 ( Young Chul Kim,Hyeong Ju Kim,Dong Ju Moon ) 한국공업화학회 1998 공업화학 Vol.9 No.1
프로판의 아크릴로니트릴로의 가암모니아 산화반응을 Nb₂O_5-V_(0.4)Mo₁Te_(0.1) 혼합촉매를 이용하여 연구하였다. 가암모니아 산화반응의 촉매적 활성은 강한 산성을 띠는 니오비움산화물을 몰리브덴계 산화물촉매(V_(0.4)Mo₁Te_(0.1))에 첨가함에 따라서 증가하였으며, 이때 아크릴로니트릴과 프로필렌의 선택율은 일정하게 유지되었다. 최대의 활성은 Nb₂O_5-V_(0.4)Mo₁Te_(0.1) 촉매 중 니오비움산화물이 25 wt%가 되었을 때 얻었으며, 니오비움산화물은 프로판의 탈수소과정에 선택적인 촉매임을 알았다. Conversion of propane to acrylonitrile via ammoxidation was studied using physically mixed catalysts composed of Nb₂O_5(10∼30 wt%) and V_(0.4)Mo₁Te_(0.1). Catalytic activities of ammoxidation were improved by adding strong acidic niobium oxide to V_(0.4)Mo₁Te_(0.1), the selectivities to acrylonitrile+propylene being remained constant. The maximum activity was obtained at the mixing ratio 25 wt% niobium oxide in Nb₂O_5-V_(0.4)Mo₁Te_(0.1). Niobium oxide was found to be a selective catalyst for the oxidative dehydrogenation of propane.
Lee, Sang Ryang,Lee, Yong Jun,Hong, Sung Gil,Kim, Young Chul,Park, Nam Cook,Moon, Dong-Ju 한국공업화학회 2003 응용화학 Vol.7 No.1
Partial oxidation of ethylene to ethylene oxide was studied over Ag/α-AI_2O_3 catalysts. To elucidate the effect of particle size on selectivity, the Ag/α-Al_2O_3 catalysts were prepared by water-alcohol methods and then calcined by changing calcination, time and atmospheric conditions. BET surface areas of catalysts before and after the reaction were characterized by N_2 physisorption and the particle size of Ag was measured by TEM and XRD analysis. It was found that the Ag/α-Al_2O_3catalyst calcined at 673 K for 2 h in air atmosphere showed higher activity than the other cataalysts. It was also found that the Ag/α-Al_2O_3 catalysts with Ag particle of about 30 nm were more stable and better active than the other catalysts.