本文探究了 γ-Fe2O3 催化剂高温 SCR 反应动力学机制，并针对 γ-Fe2O3 催化剂高温SCR 反应活性进行改性，证明了掺杂 Ti 能使 γ-Fe2O3 催化剂在高温段具有更优异的 SCR 反应活性，因而具有高温脱硝的可行性。实验证明了掺杂 Ti 能促进 γ-Fe2O3 催化剂高温 段的 NH3 吸附能力，而同时 NO 吸附能力变化不大，因此掺杂 Ti 能促进 γ-Fe2O3 催化剂 在高温段通过 Eley-Rideal 机理及 Langmuir-Hinshelwood 机理发生的 SCR 反应。硫化能使 Fe-Ti 尖晶石催化剂高温段的 NH3 吸附能力增强、NO 吸附能力减弱，因此硫化能在高温 段促进 Fe-Ti 尖晶石催化剂经 Eley-Rideal 机理发生的 SCR 反应、 抑制催化剂经 Langmuir-Hinshelwood 机理发生的 SCR 反应。且由于改性后催化剂氧化能力的降低，Fe-Ti 尖晶石及硫化后的 Fe-Ti 尖晶石催化剂的 C-O 反应受到抑制。因此，对 γ-Fe2O3 催化剂进 行改性可提高其在高温段的 SCR 反应活性。73776

毕业论文关键词 改性 高温 SCR   Eley-Rideal 机理 Langmuir-Hinshelwood 机理 

毕 业 设 计 说 明 书 外 文 摘 要

Title Modification of γ-Fe2O3 catalyst for high temperature SCR reaction

Abstract In this work, the mechanism of the high temperature selective catalytic reduction (SCR) of NO with NH3 over γ-Fe2O3 was studied, and the γ-Fe2O3 catalyst was modified for high temperature SCR reaction。 Doping with Ti can significantly improve the high temperature SCR activity of γ-Fe2O3。 Therefore, it is possible to use Fe-Ti spinel for DeNOx at high temperature。 Ti can be doped into the crystal of γ-Fe2O3 to improve the NH3 adsorption capability。 At the same time, the NO adsorption capability was not influenced。 Therefore, the rate of NO reduction over γ-Fe2O3 through the Eley-Rideal mechanism and the Langmuir-Hinshelwood mechanism were both improved by doping with Ti。 Sulfation can further improve NH3 adsorption capability, but it inhabited the NO adsorption capability。 Therefore, the rate of NO reduction through the Eley-Rideal mechanism can be further improved by sulfation, but the NO reduction through the Langmuir-Hinshelwood mechanism will be restrained by sulfation。 In addition, the oxidization capability of γ-Fe2O3 was inhibited due to doping with Ti and sulfation。  Therefore,  C-O reactions over Fe-Ti spinel and sulfated Fe-Ti spinel were both restrained。 As a result, the high temperature SCR activity of γ-Fe2O3 can be improved by doping with Ti or sulfation。

Keywords modification high temperature SCR Eley-Rideal mechanism Langmuir-Hinshelwood mechanism

本科毕业设计说明书 第 I  页

目 录

1 绪论 1

1。1 引言 1

1。2 氮氧化物控制技术 2

1。3 研究意义及主要内容 3

2 实验部分 4

2。1 实验仪器及试剂 4

2。2 催化剂的制备 5

2。3 催化剂活性评价