CIESC Journal ›› 2014, Vol. 65 ›› Issue (4): 1251-1259.DOI: 10.3969/j.issn.0438-1157.2014.04.014

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SCR denitration catalyst prepared from titanium-bearing blast furnace slag

LEI Shan1,2, YANG Juan2, YU Jian2, LIU Yunyi1, XU Guangwen2   

  1. 1 School of Chemical Engineering, Shenyang Institute of Chemical Technology, Shenyang 110142, Liaoning, China;
    2 State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2013-08-16 Revised:2014-01-08 Online:2014-04-05 Published:2014-04-05
  • Supported by:

    supported by the National Natural Science Foundation of China (21106156), the National High Technology Research and Development Program of China (2010AA065004), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA070300) and the International S&T Cooperation and Communication Program (OS2012ZR0410).

含钛高炉渣制备SCR烟气脱硝催化剂

雷珊1,2, 杨娟2, 余剑2, 刘云义1, 许光文2   

  1. 1 沈阳化工大学化学工程学院, 辽宁 沈阳 110142;
    2 中国科学院过程工程研究所多相复杂系统国家重点实验室, 北京 100190
  • 通讯作者: 许光文
  • 作者简介:雷珊(1988—),女,硕士研究生。
  • 基金资助:

    国家自然科学基金项目(21106156);国家高技术研究发展计划项目(2010AA065004);中国科学院战略性先导科技专项(XDA070300);国际科技合作与交流专项(OS2012ZR0410)。

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: