整体式V2O5-MoO3-CeOx/TiO2/堇青石SCR脱硝催化剂的制备

TheSpreparationSofSMonolithic V2O5-MoO3-CeOx/TiO2/CordieriteSCRSdenitrationScatalyst

摘要:

本文采用涂覆法在堇青石蜂窝陶瓷上负载Ce元素改性的V₂O₅-MoO₃/TiO₂脱硝催化剂。首先对涂覆浆料的固含量与粘度的关系,及涂覆浆料中有机粘结剂的选择做了进一步研究与优化,筛选出最佳的固含量及有机粘结剂。其次,研究了在V₂O₅-MoO₃/TiO₂脱硝催化剂中添加Ce元素后的脱硝催化活性。采用扫描电镜(SEM)、X射线衍射(XRD)等手段对其微观形貌和晶型进行了表征。结果表明：固含量为32%,羧甲基纤维素钠作为有机粘结剂时,催化剂粉体上载率高,涂层牢固不易脱落。与V₂O₅-MoO₃/TiO₂相比,V₂O₅-MoO₃-CeO_x/TiO₂在180-260℃的中低温脱硝活性显著提高,活性温度窗口明显拓宽。

Abstract:

The V₂O₅-MoO₃-CeO_x/TiO₂ catalyst was coated on the cordierite honeycomb ceramics by the coating method. First, the relationship between the solid content and the viscosity of the coating slurry and the choice of the organic binder in the coating slurry were studied and optimized, and the best solid content and the organic binder were screened out. Secondly, the catalytic activity of denitration in V₂O₅-MoO₃-CeO_x/TiO₂ catalyst was studied. The morphology and the crystal forms were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD). The results showed that when the solid content was 32%, sodium carboxymethyl cellulose was used as the organic binder, the loading rate of the catalyst powder was high and the coating was firm. Compared with V₂O₅-MoO₃/TiO₂, the denitrification activity of V₂O₅-MoO₃-CeO_x/TiO₂ at 180-260 ℃ was significantly improved, and the active temperature window was widened obviously.