V2O5/赤铁矿催化剂结构及其NH3选择性催化还原NOx性能

doi:10.1016/S1872-2067(12)60719-0

催化学报 ›› 2014, Vol. 35 ›› Issue (1): 99-107.DOI: 10.1016/S1872-2067(12)60719-0

V₂O₅/赤铁矿催化剂结构及其NH₃选择性催化还原NO_x性能

张萍, 陈天虎, 邹雪华, 朱承驻, 陈冬, 刘海波

合肥工业大学资源与环境工程学院纳米矿物与环境材料实验室, 安徽合肥 230009

收稿日期:2013-04-28 修回日期:2013-09-22 出版日期:2013-12-23 发布日期:2014-01-17
通讯作者: 陈天虎
基金资助:
高等学校博士学科点专项科研基金（20110111110003）；国家自然科学基金（41130206）

V₂O₅/hematite catalyst for low temperature selective catalytic reduction of NO_x with NH₃

Ping Zhang, Tianhu Chen, Xuehua Zou, Chengzhu Zhu, Dong Chen, Haibo Liu

Laboratory of Nano Mineral and Environmental Material, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China

Received:2013-04-28 Revised:2013-09-22 Online:2013-12-23 Published:2014-01-17
Contact: Tianhu Chen
Supported by:
This work was supported by the Specialized Research Fund for the Doctoral Program of Higher Education (20110111110003) and the National Natural Science Foundation of China (41130206).

摘要/Abstract

摘要：

以水热合成针铁矿为前驱体浸渍偏钒酸铵，分别于300，400和500℃空气中焙烧，制备了不同活性组分负载量的V₂O₅/赤铁矿（V/H）催化剂，用于氨选择性催化还原（SCR）脱硝。采用X射线衍射、透射电子显微镜、比表面积分析仪、程序升温还原及程序升温脱附等方法对催化剂结构进行了表征，并用标气配制模拟烟气进行了脱硝实验。结果表明，300℃煅烧3%V/H催化剂当烟气温度为250-300℃时NO转化率均可达95%以上；当配气中单独加入水蒸气或低浓度SO₂（0.01%）时，V/H催化脱硝的活性不受影响；当系统加入高浓度的SO₂（0.03%与0.05%）或同时添加H₂O与SO₂时，SCR脱硝效率下降，其机制可能是SO₂在催化剂表面竞争吸附所致，停止添加后，催化活性迅速恢复。

关键词: 铁氧化物, 氧化钒, 氮氧化物, 选择性催化还原

Abstract:

A series of V₂O₅/hematite (V/H) catalysts were prepared by impregnation of goethite with NH₄VO₃ solution and used in the selective catalytic reduction (SCR) of NO with NH₃. The catalysts were characterized by X-ray diffraction, transmission electron microscopy, N₂ adsorption, H₂ temperature-programmed reduction, and NH₃ temperature-programmed desorption. The effects of V₂O₅ loading and calcination temperature on the SCR activity were investigated. The NO conversion over 3% V/H catalysts calcined at 300℃ exceeded 95% at 250-300℃. Neither H₂O nor SO₂(0.01%) had any adverse impact on the activity, but a decrease of SCR activity was observed after high concentrations (0.03% and 0.05%) of SO₂ were introduced. Cutting off the SO₂ supply resulted in activity restoration. The simultaneous addition of 5% H₂O and 0.03% SO₂ led to a synergistic poisoning effect, but when these gases were switched off, the activity was recovered. SO₂ adsorption on the catalyst surface led to the decrease in SCR activity.

Key words: Iron oxide, Vanadic pentoxide, Nitrogen oxide, Selective catalytic reduction

张萍, 陈天虎, 邹雪华, 朱承驻, 陈冬, 刘海波. V₂O₅/赤铁矿催化剂结构及其NH₃选择性催化还原NO_x性能[J]. 催化学报, 2014, 35(1): 99-107.

Ping Zhang, Tianhu Chen, Xuehua Zou, Chengzhu Zhu, Dong Chen, Haibo Liu. V₂O₅/hematite catalyst for low temperature selective catalytic reduction of NO_x with NH₃[J]. Chinese Journal of Catalysis, 2014, 35(1): 99-107.

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V₂O₅/赤铁矿催化剂结构及其NH₃选择性催化还原NO_x性能

V₂O₅/hematite catalyst for low temperature selective catalytic reduction of NO_x with NH₃

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