改性铁基催化剂低温SCR脱硝性能优化机理

项目名称： 改性铁基催化剂低温SCR脱硝性能优化机理

项目编号： No.51276101

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 能源与动力工程

项目作者： 路春美

作者单位： 山东大学

项目金额： 80万元

中文摘要： 与实用钒钛催化剂相比，铁基催化剂具有无毒、抗H2O和SO2毒化能力强、脱硝成本低廉等优点，成为火电站SCR脱硝的研究热点。在铁氧化物中，γ-Fe2O3催化剂低温脱硝性能良好，是极具潜质的低温催化剂活性组分。本研究把微波引入催化剂制备过程，并添加过渡金属、稀土金属助剂对γ-Fe2O3铁基催化剂进行低温改性，揭示其优化脱硝反应机理。分析结构参数和运行参数对催化剂低温SCR脱硝性能的影响规律，建立其催化脱硝反应动力学模型，确定其脱硝性能与各参数间的内在联系；考察其NO和NH3脱附特性，以及瞬态反应表面吸附中间产物，确定其SCR脱硝反应机理，揭示微波，过渡金属、稀土助剂优化其低温脱硝性能的主要机理；通过对催化剂表征分析，研究微波参数，过渡金属、稀土种类、添加量等对其微观结构特性的作用规律，探讨活性组分与单/多助剂元素的协同作用机制。此研究将充实铁基低温SCR催化剂用于火电厂脱除NOx的理论基础。

中文关键词： 择性催化还原；铁基催化剂；制备工艺；助剂掺杂；稳态动力学分析

英文摘要： Compared with pratical vandia-titanate mixed metal oxide catalysis, iron-based catalyst has some advantages such as non-toxicity, good ati-H2O and SO2 poisoning, low cost of denitration and so on. Therefore, iron-based catalyst used to reduce nitrogen oxides produced from the power plant becomes the research focus.Among the iron metal oxides,γ-Fe2O3 catalyst shows the best low-temperature NH3-SCR activity, and is the great potential active component of the catalyst for low-temperature NH3-SCR. In this research project, microwave is introduced to prepareγ-Fe2O3 iron-based catalysts, and some transition metal oxides or/and rare earth metal oxides are also added into γ-Fe2O3 iron-based catalysts so as to improve its low-temperature NH3-SCR activity. At the some time, the optizimation mechanism of microwave and the additives in NH3-SCR overγ-Fe2O3 iron-based catalysts will be discussed. The effect of structural parameters and operation parameters on the low-temperature SCR activity of γ-Fe2O3 iron-based catalysts will be investigated in detail, and then the reaction kinetics model for selective catalytic reduction of NO over γ-Fe2O3 iron-based catalysts is set up so as to reveal the interal relations between SCR activity and those parameters. The adsorption/desorption capacity of NO and NH3 over γ-Fe2O3 iron-based c

英文关键词： selective catalytic reduction；iron based catalyst；preparation process；promoters doping；steady state kinetic analysis