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    • Optimizing Study on the NH3-SCR Activity of Ce-W-Ti@g-C3N4 Catalyst: Influence of Graphite Carbon Nitride Types.

    Zhibo Xiong,Jing Zhang,Fucheng Guo,Fei Zhou,Qiguo Yang,Wei Lu,Huancong Shi

    Environmental technology（2024）SCI 4区

    Univ Shanghai Sci & Technol | Zhejiang Univ

    Cited 1|Views12
    Abstract
    Herein, three g-C3N4(MCN/TCN/UCN), obtained by the direct pyrolysis of melamine/urea/thiourea respectively, were introduced as supports to optimize the NH3-SCR activity of Ce-W-Ti catalyst. Compared to CWT-400-Air, CWT@g-C3N4(2)-300-N2 exhibits lower crystalline anatase TiO2 and larger specific surface area, which improves the dispersion of Ce/W/Ti species on catalysts surface. Furthermore, the introduction of g-C3N4 as supports also contributes to doping C/N elements into Ce-W-Ti catalyst and increases the Ce3+/(Ce3++Ce4+) and Oα/(Oα+Oβ) molar ratios on catalyst surface. These all are advantageous to the NH3-SCR activity. However, UCN shows better promotional effect than MCN and TCN. This might be mainly attributed to the loose and porous stacked layered fold structure of UCN, the larger BET surface area, higher dispersion of Ce/W/Ti species and moderate weak/medium-strong acid sites of CWT@UCN(2)-300-N2. At the same time, the influence of carbon nitride amount, calcination atmosphere and calcination temperature on the NH3-SCR activity of CWT@g-C3N4 catalyst were also investigated.
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    Key words
    NH3-SCR,catalyst,Ce-W-Ti mixed oxide,carbon nitride,optimization
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    【要点】：本研究通过使用不同类型的石墨碳氮化物（g-C3N4）作为载体，优化了Ce-W-Ti催化剂的NH3-SCR活性，发现以脲素为原料制备的UCN表现出最佳的促进效果。
    

    【方法】：采用直接热解法分别制备了三种石墨碳氮化物（MCN、TCN、UCN），并将其作为载体，通过负载Ce-W-Ti，研究了载体类型对NH3-SCR活性的影响。
    

    【实验】：在空气和氮气氛围下，对Ce-W-Ti/g-C3N4催化剂进行了300°C的煅烧处理，使用CWT@g-C3N4(2)-300-N2催化剂在NH3-SCR反应中表现出较低的TiO2结晶度和较大的比表面积，提高了Ce/W/Ti物种在催化剂表面的分散性，并提高了催化活性。UCN表现出比MCN和TCN更好的促进作用，可能归因于其松散多孔的层状结构、更大的BET比表面积以及适中的弱/中强酸位。同时，还研究了碳氮化物含量、煅烧氛围和温度对NH3-SCR活性的影响。