[1]梁辉,归柯庭.纳米γ Fe2O3催化剂SCR脱除NOxx化学反应动力学[J].东南大学学报(自然科学版),2015,45(5):918-922.[doi:10.3969/j.issn.1001-0505.2015.05.017]
 Liang Hui,Gui Keting.Chemical reaction kinetics of SCR of NOxx over γ Fe2O3 nano-catalyst[J].Journal of Southeast University (Natural Science Edition),2015,45(5):918-922.[doi:10.3969/j.issn.1001-0505.2015.05.017]
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纳米γ Fe2O3催化剂SCR脱除NOxx化学反应动力学()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
45
期数:
2015年第5期
页码:
918-922
栏目:
能源与动力工程
出版日期:
2015-09-20

文章信息/Info

Title:
Chemical reaction kinetics of SCR of NOxx over γ Fe2O3 nano-catalyst
作者:
梁辉归柯庭
东南大学能源热转换及其过程测控教育部重点实验室, 南京 210096
Author(s):
Liang Hui Gui Keting
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
关键词:
纳米γ Fe2O3 化学反应动力学 活化能 原位红外漫反射光谱 选择性催化还原 脱硝
Keywords:
γ Fe2O3 nano-catalyst chemical reaction kinetics activation energy diffuse reflectance infrared fourier transform spectroscopy(DRIFTS) selective catalytic reduction denitration
分类号:
TK121
DOI:
10.3969/j.issn.1001-0505.2015.05.017
摘要:
为了研究纳米γ Fe2O3催化剂选择性催化还原法(SCR)脱硝反应机理,采用微分反应器测量了纳米γ Fe2O3催化剂上SCR反应的动力学参数,并构建了SCR反应动力学模型.实验数据分析结果表明,NH3,NO和O2的反应级数分别为0,0.78~0.93和0.09~0.11,反应活化能为57.3 kJ/mol.原位红外漫反射光谱(DRIFTS)实验结果表明:NH3能够强吸附到催化剂表面并达到饱和,进一步增加NH3的浓度并不能增加NO的转化速率;NO在有氧条件下能吸附到催化剂表面生成吸附态NO2和亚硝酸盐;在低于270 ℃的情况下SCR反应遵循Langmuir-Hinshelwood(L-H)反应机理,在高于270 ℃的情况下则主要遵循Eley-Rideal(E-R)反应机理.
Abstract:
In order to study the selective catalytic reduction(SCR)reaction mechanism over γ Fe2O3 nano-catalyst, the kinetic parameters of the SCR reaction on γ Fe2O3 nano-catalyst were investigated by the differential reactor, and a reaction kinetic model was established. The experimental data analysis results show that the reaction orders are 0, 0.78 to 0.93 and 0.09 to 0.11 for NH3, NO and O2, respectively and the activation energy is 57.3 kJ/mol. The experimental results of diffuse reflectance infrared fourier transform spectroscopy(DRIFTS)show that NH3 can be strong adsorbed to the catalyst surface and the adsorption sites can be saturated by NH3. The conversion rate of NO does not increase with the further increase of the NH3 concentration. At the presence of O2, NO can be adsorbed to catalyst surface and converted to adsorbed NO2 and nitrite species. The SCR reaction mainly follows the Langmuir-Hinshelwood(L-H)mechanism at the temperature below 270 ℃, and follows Eley-Rideal(E-R)mechanism at the temperature above 270 ℃.

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备注/Memo

备注/Memo:
收稿日期: 2014-12-30.
作者简介: 梁辉(1988—),男,博士生;归柯庭(联系人),男,博士,教授,博士生导师,ktgui@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(51276039).
引用本文: 梁辉,归柯庭.纳米γ Fe2O3催化剂SCR脱除NOxx化学反应动力学[J].东南大学学报:自然科学版,2015,45(5):918-922. [doi:10.3969/j.issn.1001-0505.2015.05.017]
更新日期/Last Update: 2015-09-20