(湖南科技大學(xué) 化學(xué)化工學(xué)院，湘潭 411201)
摘 要: 采用溶膠−凝膠法制備N-Fe/TiO2催化劑；用X射線衍射、掃描電鏡及熒光光譜等方法對其進(jìn)行表征；以低級醇類光催化消除反應(yīng)為模式反應(yīng)評價催化劑在紫外光照下的光催化性能。結(jié)果表明：催化劑制備的最佳條件為活化溫度400 ℃、活化時間3 h、鐵摻雜量0.10%~0.15%(摩爾分?jǐn)?shù))、氮摻雜量10%(摩爾分?jǐn)?shù))。0.15 g催化劑可將初始濃度均為8.3 g/m3、流速為7 mL/min的甲醇、丙醇和丁醇及初始濃度均為8.3 g/m3、流速為5 mL/min的乙醇完全消除，且催化劑連續(xù)反應(yīng)252 h沒有失去活性。在N-Fe/TiO2催化劑上，甲醇和乙醇的光催化消除反應(yīng)是一級反應(yīng)，其表觀活化能為在實驗溫度范圍內(nèi)與溫度無關(guān)的常數(shù)。
關(guān)鍵字: N-Fe/TiO2；光催化消除；低級醇類
N-Fe/TiO2 catalyst for elimination of light alcohols
（School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China）
Abstract:The N-Fe/TiO2 catalysts were prepared by sol-gel method and characterized by X-ray diffractometry, scanning electron microscopy and fluorescence emission spectroscopy. The photocatalytic eliminations of the light alcohol were used as model reactions to evaluate the photocatalytic activity of the catalysts under ultraviolet light irradiation. The results show that an optimal program of catalyst preparation is that the activation temperature is 400 ℃, activation time is 3 h, the amount of iron-doped is 0.10%−0.15% (mole fraction) and the amount of nitrogen-doped is 10% (mole fraction). Methanol, propanol and b, utanol with the initial concentration of 8.3 g/m3 and the flow rate of 7.0 mL/min, the ethanol with the initial concentration of 8.3 g/m3 and the flow rate of 5 mL/min can be completely mineralized using 0.15 g N-Fe/TiO2 as the catalyst prepared by the above optimal program. The activity of the catalyst is stable over 252 h continuous reaction. The kinetics of the photo-catalytic methanol and ethanol elimination follows the first-order reaction. The apparent activation energy is constant in the experimental temperature range.
Key words: N-Fe/TiO2; photocatalytic elimination; light alcohols
