为探究催化剂的孔结构对催化剂脱硝活性的影响，采用溶胶凝胶法分别制备了三维有序大孔-介孔(3DOM-m) CeTiOx、三维有序大孔(3DOM) CeTiOx、三维有序介孔(3DOm) CeTiOx及无序孔(DM) CeTiOx等四种不同孔结构的催化剂。NH3-SCR测试结果表明，催化剂活性依次为3DOM-m CeTiOx>3DOm CeTiOx>3DOM CeTiOx>DM CeTiOx，3DOM-m CeTiOx表现出更优异的催化活性，NO转化率在60000 h−1、250–400 ℃时超过90%。通过XRD、SEM、BET、NH3-TPD、in-situ DRIFTS等技术对催化剂进行表征分析。结果表明，催化剂的比表面积并不是决定CeTiOx脱硝活性的主导因素。3DOM-m CeTiOx具有高度有序的大孔-介孔结构、丰富的Brønsted酸酸性位点，进而提高了催化剂的脱硝活性。3DOM-m CeTiOx催化剂在NH3-SCR反应过程中同时遵循E-R机理和L-H机理。

To investigate the influence of pore structure on the catalytic activity of catalysts, four catalysts including three-dimensionally ordered macroporous-mesoporous (3DOM-m) CeTiOx, three-dimensionally ordered macroporous (3DOM) CeTiOx,  three-dimensionally ordered mesoporous (3DOm) CeTiOx and disordered mesoporous (DM) CeTiOx were synthesized by the sol-gel method. The NH3-SCR denitration testing  results show that the performance of the catalysts with different pore structures follows the sequence of 3DOM-m CeTiOx>3DOm CeTiOx>3DOM CeTiOx>DM CeTiOx, and the 3DOM-m CeTiOx shows an excellent catalytic activity, with more than 90% NO conversion  in the range of 250–400 ℃ at a GHSV of 60000 h−1 . The  characterization of catalysts by XRD, SEM, BET, NH3-TPD and in-situ DRIFTS  indicates that the surface area is not the dominant factor determining the catalytic activity of CeTiOx. 3DOM-m CeTiOx   has a highly ordered macroporous-mesoporous structure and  abundant Bronsted acidic sites,  thereby improving the denitrification activity. The  NH3-SCR reaction over the 3DOM-m CeTiOx mainly follows the L-H and E-R mechanisms.