SCR denitration catalyst prepared from titanium-bearing blast furnace slag

doi:10.3969/j.issn.0438-1157.2014.04.014

Abstract

Abstract: Titanium oxide (TiO₂) with high specific surface area was prepared from blast furnace slag by steps, in succession, extraction using dilute sulfuric acid (#em/em#.e., acidolysis), hydrolysis and high-temperature calcination, and was used as the support in preparing V₂O₅-WO₃/TiO₂ catalyst for flue gas denitration by selective catalytic reduction (SCR). The prepared TiO₂ support was characterized with XRD, XRF and BET, and the catalyst was evaluated in a laboratory fixed bed reactor for SCR of NO by NH₃ including both activity and stability in simulated flue gas containing SO₂ and H₂O. The leaching rate of TiO₂ could reach 90% under the optimized acidolysis conditions, #em/em#.e. sulfuric acid 40%(mass), acid/slag ratio 1.5, leaching time 3 h and reaction temperature 80℃. The hydrolysate was mainly composed of 74%(mass) anatase TiO₂, 21.1%（mass） amorphous SiO₂ and some other impurities. The presence of SiO₂ significantly increased the specific surface area and pore volume of the TiO₂ support, which was beneficial to disperse the loaded active catalytic components. The prepared V₂O₅- WO₃/TiO₂ catalyst with the TiO₂ support from titanium-bearing blast furnace slag exhibited higher catalytic activity than the ones prepared from commercial TiO₂ and TiOSO₄ at temperatures of 250—450℃, while it presented also good resistance even at 300℃ to the negative effects of sulfur dioxide and water in flue gas.

Key words: titanium-bearing blast furnace slag, acidolysis, titanium dioxide, support, flue gas denitration, SCR, catalyst

摘要： 以含钛高炉渣为原料，稀硫酸为溶剂提取钛液，钛液经水解、高温焙烧后制得高比表面积的TiO₂，并以其为载体采用分步浸渍法制备了V₂O₅-WO₃/ TiO₂催化剂。优化了含钛高炉渣的酸解条件，对所得TiO₂进行了XRD、XRF、BET表征，用自制催化剂评价系统考察了所制备催化剂的脱硝性能及抗硫抗水性能。结果表明：H₂SO₄浓度40%、酸渣比1.5、酸解温度80℃、酸解时间3 h条件下，TiO₂浸出率可达90%，水解产物主要为锐钛型TiO₂，纯度达到74%，含有21.2%无定形SiO₂及少量其他杂质。SiO₂的存在提高了产物的比表面积、孔径，有利于活性组分的负载。以含钛高炉渣基TiO₂为原料制备的V₂O₅-WO₃/TiO₂脱硝催化剂相比于以商业TiO₂和TiOSO₄制备的催化剂，在250～450℃具有更高的催化活性，且在300℃具有较好的抗硫抗水性能。

关键词: 含钛高炉渣, 酸解, 钛白粉, 载体, 烟气脱硝, 选择催化还原, 催化剂

CLC Number:

TQ426.6

Cite this article

LEI Shan, YANG Juan, YU Jian, LIU Yunyi, XU Guangwen. SCR denitration catalyst prepared from titanium-bearing blast furnace slag[J]. CIESC Journal, 2014, 65(4): 1251-1259.

雷珊, 杨娟, 余剑, 刘云义, 许光文. 含钛高炉渣制备SCR烟气脱硝催化剂[J]. 化工学报, 2014, 65(4): 1251-1259.

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SCR denitration catalyst prepared from titanium-bearing blast furnace slag

含钛高炉渣制备SCR烟气脱硝催化剂

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[1]	Baomin DAI, Qilong WANG, Shengchun LIU, Jianing ZHANG, Xinhai LI, Fandi ZONG. Thermodynamic performance analysis of combined cooling and heating system based on combination of CO₂ with the zeotropic refrigerant assisted subcooled [J]. CIESC Journal, 2023, 74(S1): 64-73.
[2]	Yitong LI, Hang GUO, Hao CHEN, Fang YE. Study on operating conditions of proton exchange membrane fuel cells with non-uniform catalyst distributions [J]. CIESC Journal, 2023, 74(9): 3831-3840.
[3]	Xuejin YANG, Jintao YANG, Ping NING, Fang WANG, Xiaoshuang SONG, Lijuan JIA, Jiayu FENG. Research progress in dry purification technology of highly toxic gas PH₃ [J]. CIESC Journal, 2023, 74(9): 3742-3755.
[4]	Jie CHEN, Yongsheng LIN, Kai XIAO, Chen YANG, Ting QIU. Study on catalytic synthesis of sec-butanol by tunable choline-based basic ionic liquids [J]. CIESC Journal, 2023, 74(9): 3716-3730.
[5]	Yihao ZHANG, Zhenlei WANG. Fault detection using grouped support vector data description based on maximum information coefficient [J]. CIESC Journal, 2023, 74(9): 3865-3878.
[6]	Feifei YANG, Shixi ZHAO, Wei ZHOU, Zhonghai NI. Sn doped In₂O₃ catalyst for selective hydrogenation of CO₂ to methanol [J]. CIESC Journal, 2023, 74(8): 3366-3374.
[7]	Kaixuan LI, Wei TAN, Manyu ZHANG, Zhihao XU, Xuyu WANG, Hongbing JI. Design of cobalt-nitrogen-carbon/activated carbon rich in zero valent cobalt active site and application of catalytic oxidation of formaldehyde [J]. CIESC Journal, 2023, 74(8): 3342-3352.
[8]	Xin YANG, Xiao PENG, Kairu XUE, Mengwei SU, Yan WU. Preparation of molecularly imprinted-TiO₂ and its properties of photoelectrocatalytic degradation of solubilized PHE [J]. CIESC Journal, 2023, 74(8): 3564-3571.
[9]	Manzheng ZHANG, Meng XIAO, Peiwei YAN, Zheng MIAO, Jinliang XU, Xianbing JI. Working fluid screening and thermodynamic optimization of hazardous waste incineration coupled organic Rankine cycle system [J]. CIESC Journal, 2023, 74(8): 3502-3512.
[10]	Yajie YU, Jingru LI, Shufeng ZHOU, Qingbiao LI, Guowu ZHAN. Construction of nanomaterial and integrated catalyst based on biological template: a review [J]. CIESC Journal, 2023, 74(7): 2735-2752.
[11]	Pan LI, Junyang MA, Zhihao CHEN, Li WANG, Yun GUO. Effect of the morphology of Ru/α-MnO₂ on NH₃-SCO performance [J]. CIESC Journal, 2023, 74(7): 2908-2918.
[12]	Yuming TU, Gaoyan SHAO, Jianjie CHEN, Feng LIU, Shichao TIAN, Zhiyong ZHOU, Zhongqi REN. Advances in the design, synthesis and application of calcium-based catalysts [J]. CIESC Journal, 2023, 74(7): 2717-2734.
[13]	Qiyu ZHANG, Lijun GAO, Yuhang SU, Xiaobo MA, Yicheng WANG, Yating ZHANG, Chao HU. Recent advances in carbon-based catalysts for electrochemical reduction of carbon dioxide [J]. CIESC Journal, 2023, 74(7): 2753-2772.
[14]	Jipeng ZHOU, Wenjun HE, Tao LI. Reaction engineering calculation of deactivation kinetics for ethylene catalytic oxidation over irregular-shaped catalysts [J]. CIESC Journal, 2023, 74(6): 2416-2426.
[15]	Tan ZHANG, Guang LIU, Jinping LI, Yuhan SUN. Performance regulation strategies of Ru-based nitrogen reduction electrocatalysts [J]. CIESC Journal, 2023, 74(6): 2264-2280.