V2O5/Ti-Ce-PILC在H2S选择性催化氧化过程中的催化性能

Catalytic performance of V2O5/Ti-Ce-PILC in the selective oxidation of H2S

  • 摘要: 合成了TiO2-CeO2柱撑黏土负载V2O5催化剂,通过XRD、氮气吸附脱附、TG、FT-IR、H2-TPR、NH3-TPD、XPS等方法对其物理化学性质进行了表征,研究了该催化剂在H2S选择性催化氧化反应中的活性。结果表明,负载5%V2O5的TiO2-CeO2柱撑黏土在180℃下催化效果最好,且尾气中不含SO2。V2O5、TiO2和CeO2之间的相互作用提高了催化剂的活性,CeO2提高了催化剂的热稳定性,同时提供大量晶格氧,加强了V2O5的氧化还原作用,降低了反应温度;TiO2加强了VOx和CeOx的再氧化,降低了硫酸盐的覆盖率,从而降低了催化剂的失活速率。

     

    Abstract: A series of V2O5 doped Ti-Ce-pillared clays (V2O5/Ti-Ce-PILC) were prepared and characterized by XRD, nitrogen physisorption, FT-IR, XPS, H2-TPR, TG and NH3-TPD. The catalytic performance of V2O5/Ti-Ce-PILC in the selective oxidation of H2S was investigated in a fixed bed reactor. The results illustrated that 5%V2O5 doped Ti-Ce-pillared clays performs well at 180℃ in the selective oxidation of H2S, which can be ascribed to the interaction among V2O5, TiO2 and CeO2. CeO2 can enhance the catalyst thermostability and supply more lattice oxygen, which is of benefits to the redox of V2O5 and the decrease of reaction temperature. Meanwhile, the addition of TiO2 may promote the reoxidation of VOx and CeOx and reduce the sulfate coverage, which can then postpone the catalyst deactivation.

     

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