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CFB锅炉中NOx排放及denox的应用初探

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科技创新与应用 2012年第16期2卷 15-16页

作者：邢永康福斯特惠勒能源管理(上海)有限公司上海200122

NOx与空气中的水结合会导致酸雨,一定条件下能产生光化学烟雾污染,因此其排放已经愈加受到国际社会的关注,循环流化床锅炉作为一种洁净煤燃烧技术,有较低的NOx排放,本文对循环流化床锅炉中的NOx排放及对其进行的脱硝技术进行了概述。

关键词： NOx排放循环流化床 denox

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西门子公司研制出denox柴油机催化器

车用发动机 1996年第4期 44-44页

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从废denox催化剂中回收钼与钛

中国材料进展 2000年第11期 25-25页

作者：许孙曲

denox催化剂主要用于消除燃煤发电站和垃圾焚化炉产生的气流中的NOx。其基质是TiO2(锐钛矿)，其活性组份为WO3(电站)或MoO3(焚化炉)。同时，含有微量钡、银、钒和钙。当这种催化剂被重金属污染时，就需再生。比利时发展了一种回收高熔... 详细信息

denox催化剂主要用于消除燃煤发电站和垃圾焚化炉产生的气流中的NOx。其基质是TiO2(锐钛矿)，其活性组份为WO3(电站)或MoO3(焚化炉)。同时，含有微量钡、银、钒和钙。当这种催化剂被重金属污染时，就需再生。比利时发展了一种回收高熔点金属的方法，可回收含砷极少的TiO2和纯钼溶液。研究发现，在将催化剂磨至80%-36μm后，直接碱浸可除去废denox TiO2-MoO3催化剂中93%Mo与As。为获得含砷为30ppm的TiO2基质，要用两步法处理，第1步在铝片存在下(90kg/t)，控制pH酸浸；第2步为氧化碱浸。直接碱浸的溶液或两步浸出的混合溶液用两个连续步骤处理：即添加Al(OH)3使铝浓度提高至4g/L，再用Amberlite IRA 94S树脂进行离子交换。不管溶液是哪种，在用200g/L NH4OH溶液洗脱后，都获得纯度极高(164g/L)的钼溶液。从废denox催化剂中回收钼与钛@许孙曲

关键词：催化剂 TiO denox 含砷

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从废denox催化剂中回收钼与钛

中国资源综合利用 2000年第10期 7-7页

作者：许孙曲

Ｄｅｎｏｘ催化剂主要用于消除燃煤发电站和垃圾焚化炉产生的气流中的ＮＯｘ。其基质是ＴｉＯ2 (锐钛矿 ) ,其活性组份为ＷＯ3(电站 )或ＭｏＯ3(焚化炉 )。同时 ,含有微量Ｂａ、Ａｇ、Ｖ和Ｃａ。当这种催化剂被重金属污染(如Ａｓ 2 0 0 ... 详细信息

Ｄｅｎｏｘ催化剂主要用于消除燃煤发电站和垃圾焚化炉产生的气流中的ＮＯｘ。其基质是ＴｉＯ2 (锐钛矿 ) ,其活性组份为ＷＯ3(电站 )或ＭｏＯ3(焚化炉 )。同时 ,含有微量Ｂａ、Ａｇ、Ｖ和Ｃａ。当这种催化剂被重金属污染(如Ａｓ 2 0 0 0ｐｐｍ ,Ｈｇ =8.8ｐｐｍ)时 ,就需再生。比利时发展了一种回收高熔点金属的方法。可回收含Ａｓ极少的ＴｉＯ2 和纯Ｍｏ溶液。研究发现 ,在将催化剂磨至 80 % - 36 μｍ后 ,直接碱浸可除去废ＤｅｎｏｘＴｉＯ2 -ＭｏＯ3催化剂中 93%的Ｍｏ与Ａｓ。为获得含Ａｓ为30ｐｐｍ的ＴｉＯ2 基质 ,要用两步法处理 :第一步在Ａｌ片存在下 (90ｋｇ/ｔ)控制ｐＨ酸浸 ;第二步为氧化碱浸。直接碱浸的溶液或两步浸出的混合溶液用两个连续步骤处理 :即添加Ａｌ(ＯＨ) 3 使Ａｌ浓度提高至 4ｇ/ｌ,再用ＡｍｂｅｒｌｉｔｅＩＲＡ 94Ｓ树脂进行离子交换。不管溶液是哪种 ,在用 2 0 0ｇ/ｌＮＨ4 ＯＨ溶液洗脱后 ,都获得纯度极高的Ｍｏ溶液。从废denox催化剂中回收钼与钛@许孙曲

关键词：催化剂碱浸浸出 denox

Effects of Doping CeO_2,Er_2O_3 on Properties of TiO_2-SiO_2 Ceramics for Catalyst Supporter of deNO_x

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Journal of Rare Earths 2006年第z2期24卷 234-238页

作者：祝社民沈岳松李伟峰刘亚云 College of Material Science and Engineering Nanjing University of Technology College of Life Science and Pharmacy Nanjing University of Technology

Effects of doping CeO2 and Er2O3 on the mechanical strength, thermal expansion coefficient, sintering temperature of TiO2-SiO2 ceramics were investigated. The experimental results and the microscopic analysis of SEM, XRD, TG-DSC, FT-IR and TEM show that adding CeO2 and Er2O3 into TiO2-SiO2 ceramics can prohibit the growth of its crystal grains, make their size uniform and form them into a dense structure, which finally enhance its mechanical behaviors, and the lower thermal expansion coefficient that leads to an excellent property of thermal shock resistance. After the reforming TiO2-SiO2 ceramics doped by CeO2 was sintered at 1380℃, the bending strength reached to 83 MPa, and the thermal expansion coefficient was 9.8×10-6/℃within the temperature range of 25 ~ 800℃, which provides a promising basis of making equipped honeycomb catalyst of denox.

关键词： erbium oxide cerium oxide ceramics of TiO2-SiO2 denox bending strength thermal expansion rare earths

Metal-organic framework loaded manganese oxides as efficient catalysts for low-temperature selective catalytic reduction of NO with NH3

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Frontiers of Chemical Science and Engineering 2017年第4期11卷 594-602页

作者： Minhua Zhang Baojuan Huang Haoxi Jiang Yifei Chen . Key Laboratory for Green Chemical Technology of Ministry of Education R&D Center for Petrochemical Technology Tianjin University Tianjin 300072 China.. Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 China

A mild in-situ deposition method was used to fabricate Mn-based catalysts on a UiO-66 carder for the selective catalytic reduction of NO by NH3 （NH3-SCR）. The catalyst with 8.5 wt-% MnOx loading had the highest catalytic activity for NH3-SCR with a wide temperature window （100-290 C） for 90% NO conversion. Char- acterization of the prepared MnOx/UiO-66 catalysts showed that the catalysts had the crystal structure and porosity of the UiO-66 carrier and that the manganese particles were well-distributed on the surface of the catalyst. X-ray photoelectron spectroscopy analysis showed that there are strong interactions between the MnOx and the Zr oxide secondary building units of the UiO-66 which has a positive effect on the catalytic activity. The 8.5 wt-% MnOx catalyst maintained excellent activity during a 24-h stability test and exhibited good resistance to SO2 poisoning.

关键词： metal-organic framework selective catalyticreduction manganese oxides denox SO2 resistance

Chemical poison and regeneration of SCR catalysts for NOx removal from stationary sources

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Frontiers of Environmental Science & Engineering 2016年第3期10卷 413-427页

作者： Junhua LI Yue PENG Huazhen CHANG Xiang LI John C. CRITTENDEN Jiming HAO State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China School of Civil and Environmental Engineering and the Brook Byers Institute for Sustainable Systems Georgia Institute of Technology 800 West Peachtree Street Suite 400 F-H Atlanta GA 30332-0595 United States School of Environment and Natural Resource Renmin University of China Beijing 100872 China

Selective catalytic reduction （SCR） of NOx with NH3 is an effective technique to remove NOx from stationary sources, such as coal-fired power plant and industrial boilers. Some of elements in the fly ash deactivate the catalyst due to strong chemisorptions on the active sites. The poisons may act by simply blocking active sites or alter the adsorption behaviors of reactants and products by an electronic interaction. This review is mainly focused on the chemical poisoning on V2O5-based catalysts, environmental-benign catalysts and low temperature catalysts. Several common poisons including alkali/alkaline earth metals, SO2 and heavy metals etc. are referred and their poisoning mechanisms on catalysts are discussed. The regeneration methods of poisoned catalysts and the development of poison-resistance catalysts are also compared and analyzed. Finally, future research directions in developing poisoning resistance catalysts and facile efficient regeneration methods for SCR catalysts are proposed.

关键词： flue gas denox SCR catalyst poison and regeneration

A novel catalyst of silicon cerium complex oxides for selective catalytic reduction of NO by NH_3

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Journal of Rare Earths 2010年第5期28卷 721-726页

作者：徐海涛沈岳松邵成华林福文祝社民丘泰 School of Energy & Environment Southeast University College of Materials Science and Engineering Nanjing University of Technology

A series of CeO2/SiO2 and SixCe1–xO2 complex oxides supported on an activated Al2TiO5-TiO2-SiO2 complex phase (ATS) ceramics were prepared by step impregnation and co-impregnation methods, and characterized by N2-BET, XRD, SEM and NH3-TPD techniques. The effects of reaction temperature, CeO2/SiO2 loadings and Si/Ce molar ratio on the granular catalysts for NO selective catalytic reduction with ammonia (NH3-SCR) were studied. Results indicated that both CeO2/SiO2/ATS and CeO2/ATS catalysts showed the same ac...

关键词： silicon cerium complex oxides selective catalytic reduction denox synergetic catalysis rare earths

Photo-reduction of NO by g-C3N4@foamed ceramic

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Chinese Journal of Chemical Engineering 2020年第7期28卷 1840-1846页

作者： Rui Zheng Chunhu Li Chengzhen Zhang Wentai Wang Liang Wang Lijuan Feng Junjie Bian Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China

G-C3N4 was supported on the surface of foamed ceramic,and the g-C3N4@foamed ceramic was packed in the photocatalytic reactor in a layered *** of urea and H2O2 concentration on NO conversion were *** experiments were carried out to investigate the change of NO conversion with time under different concentrations of *** contribution of each route that NO converted and the selectivities of products were *** showed that the photo-reduction of NO accounted for 2%,and the photo-oxidation of NO accounted for 14%,and the rest was absorbed by the *** include ammonia(NH+4-N),nitrogen(N2),nitrite(NO-2-N)and nitrate(NO-3-N),of which N2 accounted for 9%.

关键词： denox Photocatalysis g-C3N4@foamed ceramic Photo-reduction