LaMnxFe1-xO3催化剂的制备及其催化甲烷燃烧性能研究

本实验通过共沉淀法，分别采用Na2CO3、（NH4）2CO3作为沉淀剂制备钙钛矿型催化剂LaMnxFe1-xO3（x=0,0.2,0.4,0.6,0,8,1.0）。借助于BET、H2-TPR、XRD等现有实验室设备对其物理性质进行表征，用微型固定床反应器测试其催化甲烷的性能，研究不同掺杂量Mn对催化剂催化甲烷燃烧的性能的影响及两种不同沉淀剂对催化剂性能的影响。实验结果表明采用Na2CO3为沉淀剂时，随着Mn的量的增加，催化剂的比表面积总体上逐渐增大，X=1.0时催化活性最佳；而用（NH4）2CO3为沉淀剂时，随着Mn的量增加，催化剂的比表面积先变大后变小，X=0.2时催化剂的活性最好，说明不同掺杂量的Mn对催化剂的结构和性能的影响不一样，而以不同沉淀剂制备的催化剂，其结构和性能也是不一样的。此实验得到的最佳催化剂起燃温度大约都在400℃，当温度达到650℃左右，甲烷转化率可达99%。

关键词：共沉淀法；沉淀剂；甲烷催化燃烧LaMnxFe1-xO3

The study on Preparation and Properties of LaMnxFe1-xO3 for Methane Catalytic Combustion
 
Abstract: This experiment is adopting copnecipitation and using Na2CO3 and (NH4)2CO3 separately to prepare catalyst of perovskite LaMnxFe1-xO3(x=0,0.2,0.4,0.6,0.8,1.0). We characterize its physical properties by using BET、 XRD、 H2-TPR and other technologies，in order to text the performance of catalystic combusiton of methane,we use fixed bed micro-reactor to study different doping ration of  Mn which will how to effect catalytic combusition of methane ,as well as the influence on catalystic performance by two kinds of different precipitator . The experiment result expresses that specific surface area of catalyst totally increases with the increasing of the amount of  Mn gradually ,when we take sodium carbonate as precipitant and the activity of catalyst is best when x=1.0;Similarly,taking ( NH4)2CO3 as precipitant ,specific surface area of catalyst increased initially then reduced with the addition of the ancount of  Mn and the activity of catalyst is best when x=0.2.
     To sum up .different doping amount for Mn will impact the structure and properties of catalyst differently, and the structure ,the properties of catalyst are abviously different if we prepare catalyst by different precipitators.the most convenient temperature,which the experiment shows,is about 400℃，and the conversion of methane could be 99% when it reaches 650℃.

Key Words: coprecipitation；precipitator；the catalystic combustionof methance；LaMnxFe1-xO3

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