(湖南科技大學(xué) 化學(xué)化工學(xué)院，湘潭 411201)
摘 要: 采用沉積−沉淀法制備Au/TiO2催化劑，并用IR、TG-DTA、XRD、TEM、BET、FL、XPS、UV-vis DRS和PL等分析方法對其進(jìn)行表征；測試和計算在甲醇的光催化消除反應(yīng)中Au/TiO2催化劑的動力學(xué)參數(shù)；以低級醇類消除反應(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：Au質(zhì)量分?jǐn)?shù)為1%的Au/TiO2催化劑在200 ℃下活化4 h的光催化活性最佳，0.15 g催化劑可將初始濃度為7.0 g/m3、流速為12.5 mL/min的甲醇和初始濃度為2.14 g/m3、流速為5 mL/min的乙醇以及初始濃度為2.21 g/m3、流速為4 mL/min的正丙醇完全消除；得到的反應(yīng)活化能Ea = 14.80 kJ/mol，擬合的曲線線性關(guān)系好(R = 0.981 1)，符合一級動力學(xué)反應(yīng)規(guī)律。
關(guān)鍵字: Au/TiO2；光催化消除；甲醇；乙醇；正丙醇
（School of Chemistry and Chemical Engineering, Hunan University of Science and Technology,
Xiangtan 411201, China）
Abstract:Au/TiO2 catalyst was prepared by deposition-precipitation methods, and characterized by IR, TG-DTA, XRD, TEM, BET, FL, XPS and UV-vis DRS spectrum analysis. The dynamic parameters of the elimination of methanol over Au/TiO2 catalyst were also tested and computed. The photocatalytic eliminations of alcohol steams (methanol, ethanol, n-propanol) were used as model reaction to evaluate the photocatalytic activity of the catalyst under ultraviolet light irradiation. The results show that TiO2 catalyst doped with 1%Au activated under 400 ℃ for 4 h has the highest activity. Methanol with initial concentration of 7.0 g/m3 and flow rate of 12.5 mL/min, ethanol with initial concentration of 2.14 g/m3 and flow rate of 5 mL/min, propanol with initial concentration of 2.21 g/m3 and flow rate of 4.0 mL/min can be completely eliminated when 0.15 g catalysts are used. The activation energy is 14.80 kJ/mol, the pre-exponential factor is 1.126 1 /s and the correlation coefficient R is 0.981 1, which accords to the first order dynamics law.
Key words: Au/TiO2; photocatalytic elimination; methanol; ethanol; propanol
