Janbey Alan, Clark Wayne, Noordally Ehsan, Grimes Sue, Tahir Saad
The London College, University College Kensington, Victoria Gardens, W11 3PE, London, UK.
Chemosphere. 2003 Aug;52(6):1041-6. doi: 10.1016/S0045-6535(03)00292-3.
Using a bench-scale rig, the activities of Pt, Pd and Pt+Pd catalysts supported on gamma-Al(2)O(3) and on TiO(2) (anatase) for the complete oxidation of methane (300 ppmv) in air have been measured as a function of temperature; values of T(10), T(50) and T(90) together with the Arrhenius parameters (activation energy and pre-exponential factor) are reported. Pt is less active than Pd when deposited on the surface of the TiO(2), but more active when deposited on gamma-Al(2)O(3), however when combined, the Pt+Pd mixture is more active than either metal individually. The T(10) for Pt+Pd/gamma-Al(2)O(3) was being as low as 228 degrees C. The significance of the Arrhenius parameters, for metal containing catalysts is that they exhibit compensation with increasing activation energy, while securing a more rapid increase in conversion from 0% to 100% when the temperature is increased.
使用小型试验装置，已测量了负载在γ - Al₂O₃和TiO₂（锐钛矿型）上的Pt、Pd以及Pt + Pd催化剂对空气中甲烷（300 ppmv）完全氧化的活性随温度的变化情况；报告了T₁₀、T₅₀和T₉₀的值以及阿累尼乌斯参数（活化能和指前因子）。当沉积在TiO₂表面时，Pt的活性低于Pd，但沉积在γ - Al₂O₃上时活性更高，然而，当两者组合时，Pt + Pd混合物的活性比任何一种金属单独存在时都更高。Pt + Pd/γ - Al₂O₃的T₁₀低至228℃。含金属催化剂的阿累尼乌斯参数的意义在于，它们随着活化能的增加而呈现出补偿效应，同时在温度升高时能确保转化率从0%到100%有更快的增加。
