| 新型铈钨钛复合氧化物催化还原脱硝机理 |
| |
| 引用本文： | 刘晶,熊志波,周飞,金晶,陆威,张磊. 新型铈钨钛复合氧化物催化还原脱硝机理[J]. 中国环境科学, 2018, 38(5): 1670-1676 |
| |
| 作者姓名： | 刘晶 熊志波 周飞 金晶 陆威 张磊 |
| |
| 作者单位： | 1. 上海理工大学能源与动力工程学院, 上海 200093;2. 上海理工大学, 流动控制与仿真重点实验室, 上海 200093;3. 华能石岛湾核电有限公司, 山东 荣成 264312 |
| |
| 基金项目： | 国家自然科学基金资助项目（51406118）；上海市青年东方学者岗位计划资助项目（QD2015017）；上海理工大学流动控制与仿真重点实验室资助项目（D15013） |
| |
| 摘 要： | 利用水热共沉淀法制备了铈钨钛复合氧化物催化剂，考察了H2O2络合修饰对其催化脱硝转化频率（TOF）的影响；并借助傅里叶原位红外光谱仪研究了H2O2络合修饰后铈钨钛复合氧化物的催化脱硝机理.结果表明：H2O2络合修饰可增强铈钨钛复合氧化物表面Brønsted酸位强度，提高其表面NH3低温吸附和中低温NH3-SCR脱硝性能，400℃时其NOx催化脱除频率TOF高达0.658s-1；NH3和NOx在H2O2络合修饰后铈钨钛复合氧化物表面存在竞争吸附，其表面催化脱硝反应主要为吸附态NH3、NH2和NH4+与气态NO+O2的反应，其低温NH3-SCR反应机理遵循Eley-Rideal（E-R）机理.
|
| 关 键 词： | 选择性催化还原脱硝 铈钨钛复合氧化物 H2O2络合修饰 转化频率 脱硝机理 |
| 收稿时间： | 2017-09-27 |
The NH3-SCR mechanism of a novel cerium-tungsten-titanium mixed oxide catalyst prepared through the hydrothermal co-precipitation method modified by H2O2 complex |
| |
| LIU Jing,XIONG Zhi-bo,ZHOU Fei,JIN Jing,LU Wei,ZHANG Lei. The NH3-SCR mechanism of a novel cerium-tungsten-titanium mixed oxide catalyst prepared through the hydrothermal co-precipitation method modified by H2O2 complex[J]. China Environmental Science, 2018, 38(5): 1670-1676 |
| |
| Authors: | LIU Jing XIONG Zhi-bo ZHOU Fei JIN Jing LU Wei ZHANG Lei |
| |
| Affiliation: | 1. School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai 200093, China;2. Key Laboratory of Flow Control and Simulation, University of Shanghai for Science & Technology, Shanghai 200093, China;3. Huaneng Shandong Shidao Bay Nuclear Power Co. Ltd, Rongcheng 264312, China |
| |
| Abstract: | Influence of H2O2 complex modification on the NH3-SCR Turnover Frequency (TOF) of cerium-tungsten-titanium mixed oxide catalyst prepared through the hydrothermal co-precipitation method was investigated. And the NH3-SCR mechanism for the catalyst modified by H2O2 complex was also studied by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The results indicated that the intensity of Brønsted acid for mixed oxide was improved by H2O2 complex modification. Its low-temperature NH3 adsorption ability and low-medium temperature NH3-SCR activity were enhanced. The TOF value of NOx reduction at 400℃ was 0.658s-1 for the catalyst modified by H2O2 complex. There existed the competitive adsorption of NH3 and NOx on its surface. The NH3-SCR reaction was mainly the reaction between the adsorption of NH3 group (NH3, NH2 and NH4+) and the gaseous NOx on the surface of cerium-tungsten-titanium mixed oxide catalyst modified by H2O2 complex, and its low-temperature NH3-SCR mechanism obeys the Eley-Rideal mechanism. |
| |
| Keywords: | selective catalytic reduction of NOx with NH3 cerium-tungsten-titanium mixed oxide H2O2 complex modification turnover frequency mechanism |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国环境科学》浏览原始摘要信息 |
|
点击此处可从《中国环境科学》下载全文 |
