Elemental mercury removal by CeO2/TiO2-PILCs under simulated coal-fired flue gas

被引：65
作者：
He, Chuan [1 ,2 ]
Shen, Boxiong [1 ]
Chi, Guilong [2 ]
Li, Fukuan [2 ]
机构：
[1] Hebei Univ Technol, Sch Energy & Environm Engn, Tianjin, Peoples R China
[2] Nankai Univ, Coll Environm Sci & Engn, Tianjin 300071, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2016年 / 300卷
关键词：
Mercury oxidation; Pillared clay; Flue gas compositions; Cerium oxide; SELECTIVE CATALYTIC-REDUCTION; PILLARED CLAY CATALYSTS; MAGNETOSPHERES CATALYST; V2O5-WO3/TIO2; CATALYST; OXIDIZED MERCURY; ACTIVATED CARBON; HG-0; OXIDATION; NO; OXIDE; SCR;
D O I：
10.1016/j.cej.2016.04.017
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
CeO2/TiO2-PILCs with different Ce loading were synthesized by an impregnation method for Hg-0 removal in flue gas considering the effect of various flue gas compositions. Nitrogen adsorption-desorption, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectrometer were employed for material characterization. The mechanisms of the effect of gas compositions on Hg-0 oxidation were discovered in detail in this paper. The results demonstrated that 15% Ce/Ti-PILC has the best Hg-0 oxidation efficiency at 300 degrees C under N-2 + O-2 due to the redox switch of Ce4+/Ce3+. The presence of SO2 in flue gas could restrain the oxidation activity by generating SO42- on 15% Ce/Ti-PILC surface. Hg oxidation was enhanced by HCI in flue gas because of the Deacon mechanism. NO2 was detected on the catalyst surface when NO was introduced into the in flue gas, which was responsible for the promotional effect of NO on Hg oxidation. The prohibitive influence of NH3 and H2O on Hg oxidation was obvious, which was due to the competitive adsorption. CeO2/TiO2-PILCs was demonstrated to be a potential catalysts for Hg oxidation in flue gas. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：1 / 8
页数：8
相关论文
共 53 条
[21]   Impact of SO2 on elemental mercury oxidation over CeO2-TiO2 catalyst [J].
Li, Hailong ;
Wu, Chang-Yu ;
Li, Ying ;
Li, Liqing ;
Zhao, Yongchun ;
Zhang, Junying .
CHEMICAL ENGINEERING JOURNAL, 2013, 219 :319-326
[22]   Role of flue gas components in mercury oxidation over TiO2 supported MnOx-CeO2 mixed-oxide at low temperature [J].
Li, Hailong ;
Wu, Chang-Yu ;
Li, Ying ;
Li, Liqing ;
Zhao, Yongchun ;
Zhang, Junying .
JOURNAL OF HAZARDOUS MATERIALS, 2012, 243 :117-123
[23]   Superior activity of MnOx-CeO2/TiO2 catalyst for catalytic oxidation of elemental mercury at low flue gas temperatures [J].
Li, Hailong ;
Wu, Chang-Yu ;
Li, Ying ;
Zhang, Junying .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2012, 111 :381-388
[24]   CeO2-TiO2 Catalysts for Catalytic Oxidation of Elemental Mercury in Low-Rank Coal Combustion Flue Gas [J].
Li, Hailong ;
Wu, Chang-Yu ;
Li, Ying ;
Zhang, Junying .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2011, 45 (17) :7394-7400
[25]   Oxidation and capture of elemental mercury over SiO2-TiO2-V2O5 catalysts in simulated low-rank coal combustion flue gas [J].
Li, Hailong ;
Li, Ying ;
Wu, Chang-Yu ;
Zhang, Junying .
CHEMICAL ENGINEERING JOURNAL, 2011, 169 (1-3) :186-193
[26]   The role of titania pillar in copper-ion exchanged titania pillared clays for the selective catalytic reduction of NO by propylene [J].
Li, Xinyong ;
Lu, Guang ;
Qu, Zhenping ;
Zhang, Dongke ;
Liu, Shaomin .
APPLIED CATALYSIS A-GENERAL, 2011, 398 (1-2) :82-87
[27]   Development of silica/vanadia/titania catalysts for removal of elemental mercury from coal-combustion flue gas [J].
Li, Ying ;
Murphy, Patrick D. ;
Wu, Chang-Yu ;
Powers, Kevin W. ;
Bonzongo, Jean-Claude J. .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2008, 42 (14) :5304-5309
[28]   Oxygen Vacancy Clusters Promoting Reducibility and Activity of Ceria Nanorods [J].
Liu, Xiangwen ;
Zhou, Kebin ;
Wang, Lei ;
Wang, Baoyi ;
Li, Yadong .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2009, 131 (09) :3140-+
[29]   Roles of Sulfuric Acid in Elemental Mercury Removal by Activated Carbon and Sulfur-Impregnated Activated Carbon [J].
Morris, Eric A. ;
Kirk, Donald W. ;
Jia, Charles Q. ;
Morita, Kazuki .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2012, 46 (14) :7905-7912
[30]   Survey of catalysts for oxidation of mercury in flue gas [J].
Presto, Albert A. ;
Granite, Evan J. .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2006, 40 (18) :5601-5609
123456