In our study, a series of sphere morphology of TiO₂ supports owned the different structural units, including the flower-like sphere with thin-long nanorods (TiO₂-75), nanosheets-assembled sphere with broad-short nanorods (TiO₂-50) and particle-assembled sphere (TiO₂-30) which were synthesized with adjusting volume ratio of Titanium (IV) isopropoxide/acetic acid by solvothermal method. Subsequently, CeO₂–WO₃/TiO₂ catalysts were prepared by simple impregnation methods and applied for selective catalytic reduction of NO_x with NH₃. Notably, the TiO₂ sphere morphology gradually varied from flower-like sphere to particle-assembled sphere with the increase volume ratio of Titanium (IV) isopropoxide/acetic acid. Meanwhile, the microscopic structural units of morphology for TiO₂ support could be regularly controlled by adjusting volume ratio of Titanium (IV) isopropoxide/acetic acid. Among, the optimal flower-like sphere TiO₂ morphology with thin-long nanorods had the best catalytic performance when the volume ratio was 1:75, which could be attributed to bigger pore structure and higher specific surface area supplying enough dispersion for active ingredient, adsorption of reactants and exposure of more active sites. Meanwhile, it could be found that the redox ability and abundant surface acidity of the CeO₂–WO₃/TiO₂ catalyst played a critical role in catalytic activity via a series of characterizations.

在我们的研究中，一系列的TiO球体形态_2点支撑拥有的不同结构单元，包括花状球体细长的纳米棒（的TiO ₂ -75），纳米片组装球与宽短的纳米棒（的TiO ₂ -通过溶剂热法调节异丙醇钛（IV）/乙酸的体积比，合成50）和颗粒组装的球体（TiO ₂ -30）。随后，通过简单的浸渍方法制备了CeO ₂ -WO ₃ / TiO ₂催化剂，并将其用于NH ₃选择性催化还原NO _x。值得注意的是，TiO ₂随着异丙醇钛（IV）/乙酸体积比的增加，球的形貌逐渐从花状球状变为颗粒状球状。同时，可以通过调节异丙醇钛（IV）/乙酸的体积比来规律地控制TiO ₂载体的形貌微观结构单元。其中，当长径比为1:75时，具有细长纳米棒的最佳花状球状TiO ₂形态具有最佳的催化性能，这可能是由于较大的孔结构和较高的比表面积为活性成分提供了足够的分散性所致；反应物的吸附和更多活性位点的暴露。同时，可以发现CeO ₂的氧化还原能力和丰富的表面酸度–WO ₃ / TiO ₂催化剂通过一系列表征在催化活性中起着关键作用。