Optimization Study On The Preparation Of Mn-Ce Catalysts

Because of the low cost, advanced technologies, and convenience in management and transportation, the landfill was now one of the most recommendable technologies for the garbage treatment home and abroad. However, a great deal of highly organic concentrated, highly toxic, and non-biodegradable leachates, produced in process of municipal landfill, will appear and cause harmful danger to the environment and the public health. At present, the main methods to treat landfill leachates include biological methods and physical-chemical methods. While the ratio of BOD5/COD is larger than 0.3, the landfill leachates presents good biodegradability, which can be disposed in biological methods. While the ratio of BOD5/COD is smaller (0.07-0.2), the landfill leachates are resistant to biological treatment because of the difficulty to remove the highly toxic organic compounds, so physical-chemical methods are much better. The physical-chemical treatment of the landfill leachates need short operating period but relatively high operating cost. So in the field of landfill leachates treatment, one of the research focuses is to find a disposal method independent to the water quality traits both home and abroad. Catalytic wet air oxidation (CWAO) was a method of oxidizing dissolvable or suspended organic compounds as well as reducible inorganic compounds with oxygen or air under the circumstances of high temperature and high pressure in liquid phase. In this process, complex organic compounds are mostly oxidized into carbon dioxide and water without producing NOX, SO2, HCl, dioxins, furans and fly ash. In the process of catalytic wet air oxidation (CWAO) reaction temperature, reaction time, original liquid concentration, oxygen pressure and catalyst are important factors influencing remove rate. Among them catalyst is most important, so it is necessary to choose the excellent catalyst. Along with the scientific development, mathematical model becomes a popular noun. Mathematical model is the simplification of things. Mathematical model is on the significance of the Mn-Ce catalyst preparing process, it can forecasts and optimizes experiment condition. Through mathematics modeling we can get optimal estate.The mathematical simulation method was used in this paper to optimize Mn-Ce catalyst, which was used in the catalytic wet air oxidation of sodium butyrate, and established mathematical models which contains the single factor influencing mathematical models and the combined action one for the three main factors (metal matching, baking temperature, and baking time) of the catalyst preparation. Then, to complete the optimization problem of the mathematical models, and to analyze major and minor sides.First, citrate route with combustion for preparing Mn-Ce catalyst, get related data. Choose different levels of the three main factors (metal matching , baking temperature, baking time)of the catalyst preparation basing on the experimental program to get catalyst, then, use remove rate of TOC to appraise catalytic activity, get data.Secondly, establishment mathematics models. Because the chemical reaction of the catalyst preparing process is a complicated system, therefore, the application of statistical regression analysis for established mathematics models was used in this paper, acquiring extreme value in available range for these models'optimization solution, analysis of variance used for the three factors'test of significance. The large numeric software MATLAB actions main assistance tool, pass to write its procedure language sentence to solve the problem of completion mathematics models and optimizing.Pass the analysis to the experiment data, establish the mathematics model of the single factor influence catalyst preparing process first; secondly, considering the influence of single factors and cross correlation at the same time, establish mathematics model, and pass verification; solve the mathematics models ,get the optimization result got more catalytic activity catalyst. This paper analyses that: the influence of baking temperature was of, baking time was not of significance, and metal matching was of the most significance. There relation is: metal matching >baking temperature>baking time.Results show, establishing mathematics model can ascertain regularity of main factors'(metal matching, baking temperature, baking time)influence in catalyst preparing process, optimizing and analyze major and minor sides can help get catalyst which has more catalytic activity. Therefore, mathematical simulation on the significance of catalyst preparing can forecast and optimize experimental result, decrease the waste, save time.