Synthesis Of MnCeO_x And Their Catalytic Wet Air Oxidation Properties Of Phenol

Phenol is a common industrial waste, which has a high toxicity, high concentration,strong odor, poor biodegradability characteristics, using the traditional methods are difficult todeal with compliance. Currently, wet oxidation technology is an effective approach towastewater containing phenol. With low cost, high activity, stability and good selectivitywhich in Mn, Ce catalyst active ingredients.Therefore, the preparation and properties ofcerium catalyst influencing factors of manganese has important significance. In this paper,co-precipitation method were used, oxidation-reduction method and transition metal dopingprepared a series of legal MnCeOxcomposite catalyst, the influence of the preparation methodand preparation conditions on material structure and catalytic wet oxidation properties.Themain research contents and results are listed as follows：（1）The synthesis of MnCeOxby a co-precipitation method and their catalytic wetoxidation properties.Co-precipitation method for preparing MnCeOxcomposite catalyst preparation methodsfrom precipitating agent and the morphology of both the nature of the impact MnCeOxTexture and CWAO composite catalyst activity was studied. Respectively precipitantpotassium hydroxide, sodium hydroxide, ammonia preparation PP,SP, AP three kinds ofcomposite oxides proved precipitant mainly affect the catalytic activity by changing thetextural properties of the product. By co-precipitation method and fractional precipitationsynthesized CP, FP-1and FP-2three kinds MnCeOxcomposite oxide, the results show thatthe catalytic activity of the synthesized MnCeOxbinary composite oxide were significantlyhigher than the one-component oxides, and can be prepared in a manner regulated MnCeOxcomposite oxide crystalline state.（2）The preparation of MnCeOxby a redoxprocess and their catalytic wet oxidationproperties.Using redoxprocess prepared MnCeOxcomplex catalysts, effects of pH, reaction time,calcination temperature and time and other aspects of cerium manganese catalyst activity.Determining the redox catalyst prepared MnCeOxoptimum conditions: the reaction was Ce/Mn molar ratio of3:1, the reaction temperature was60℃, the reaction was stirred for2h, the KOH solution used in this process to control pH=11, the furnace calcination temperature600℃, roasting time4h, MnCeOxcatalyst obtained in the catalytic temperature of100℃,under conditions of oxygen partial pressure1MPa reaction120min, TOC removal ratereached95%.（3）Preparation MnCeOx doped with transition metals and their CWAO performance.Respectively impregnation, coprecipitation doping method, redox doping method usingtransition metal catalysts modified for MnCeOxdoping experiments showed that Cu2+as amodel, all three doping methods to prepare the Cu-MnCeOxdescending order modifiedcatalyst activity is: Cu-RP> Cu-CP> Cu-DP. The use of redox catalysts prepared by doping in,Cu2+and Co2+doping improves the catalytic activity MnCeOx, Ni2+doping but inhibits thecatalytic activity of MnCeOx. Coprecipitation doped with the same effect, and Zn2+, Fe3+MnCeOxdoping can also improve the catalytic activity.