The Au/CeO₂-Al₂O₃ Catalyst On CO Conversion Intrinsic Dynamics Research

In fuel cell applications as an object, a tubular isothermal fixed-bed integral reactor (internal diameter 4mm), experimental study of preparation conditions on the Supported Au/CeO2-Al2O3 catalyst for carbon monoxide conversion impact performance. Based on Au/CeO2-Al2O3 catalyst selection determined at atmospheric pressure,280?-370? and gas composition (mole fraction) CO 0.023-0.0534, CO2 0.023-0.0534?H20.161-0.3738?H2O 0.2333-0.3896?N2 0.125-0.4684 kinetics of CO conversion of the levy under conditions carried out.CeO2 content (20%-80%) Au/CeO2-Al2O3 catalyst conversion performance on the experimental results show that with the upgrading of CeO2 content, prepared Au/CeO2-Al2O3 CO conversion catalyst on the show a gradual increasing trend, Moreover, the higher the conversion the reaction temperature, the more significant increasing trend. Under the same conditions, the process of preparation of the catalyst to introduce a small molecule directed gas H2, can be prepared in the Au/CeO2-Al2O3 catalyst for CO conversion performance better.Determined based on the selection of Au/CeO2-Al2O3 catalyst, the system of reaction temperature (250?-380?), steam-gas ratio (0.4-1.2) and airspeed (2000h-1?13000h-1) for the CO shift reaction process influences. The results show that, (1) The conversion of CO increases monotonously with the reaction temperature, but later than 350? and, slowly and gradually increasing the amplitude close to equilibrium, thereby presumed that the catalyst used in the experiments has a faster rate of CO conversion. (2) A slow upward trend in CO conversion with increasing steam-gas ratio presented, albeit small, indicating that the experimental catalyst used for steam and gas is not sensitive, can be operated at low steam-gas ratio condition, which is to reduce steam consumption and energy is very favorable. (3) CO conversion rate decreases monotonously with increasing airspeed, airspeed after more than 10000h-1, reduced speed slowed and remained at around 50%, which indicates that the catalyst used in the experiment is relatively good shift catalyst.Select document common primary, secondary, power law and Hyperbolic four kinds CO kinetic model candidate model using Marquardt optimization algorithm intrinsic kinetics experimental data search, optimal selection, the establishment of experiments with Au/CeO2-Al2O3 model of intrinsic kinetics shift catalyst, residual analysis and statistical test results show that the construction of four models are highly significant and credible, but the power-law model and the type of hyperbolic model is significantly better than a model and two models from the fuel cell applications significance analysis to hyperbolic model is more appropriate.