A highly active catalyst of cerium–tungsten–titanium mixed oxide was synthesized by introducing Ce4+ and H2O2 in the base sample of Ce20W10Ti100Oz–Ce3+. As a consequence, the NH3-SCR activity of Ce20W10Ti100Oz–Ce3+ is significantly improved as the additives of Ce4+ and H2O2 enlarge the Brunauer–Emmett–Teller (BET) surface area by refining its pore size. Meanwhile, the introduction of Ce4+ increases the Lewis acid sites of Ce20W10Ti100Oz–Ce3+ and decreases its low-temperature Brønsted acid sites. The further addition of H2O2 improves the Brønsted acid sites and dispersion of cerium/tungsten species, and thereby enhances the concentrations of the adsorbed oxygen (Oα) and the adsorbed oxygen $\lpar {\rm {O}^{\prime}}_{\rm \alpha} \rpar$ due to the activation of chemisorbed water on the surface of the catalyst. The addition of Ce4+ and H2O2 shows a synergistic promotional effect, which is due to the largest BET surface area and the highest concentrations of Oα or/and ${\rm {O}^{\prime}}_{\rm \alpha}$ . Ce20W10Ti100Oz–Ce3+:Ce4+ = 17.5:2.5 + H2O2 exhibits the highest catalytic activity compared with the conventional ones (Fig. 5).

通过在Ce 20 W 10 Ti 100 O z –Ce 3+的基础样品中引入Ce 4+和H 2 O 2来合成铈-钨-钛混合氧化物的高活性催化剂。结果，随着Ce 4+和H 2 O 2的添加扩大了Brunauer-Emmett-Teller（BET）的表面积，Ce 20 W 10 Ti 100 O z –Ce 3+的NH 3 -SCR活性得到了显着改善。通过细化其孔径。同时，Ce 4+的引入增加Ce 20 W 10 Ti 100 O z –Ce 3+的Lewis酸中心，并降低其低温Brønsted酸中心。进一步添加H 2 O 2可改善布朗斯台德酸中心和铈/钨物种的分散，从而提高吸附氧（Oα）和吸附氧的浓度 $ \ lpar {\ rm {O} ^ {\素}} _ {\ rm \ alpha} \ rpar $是由于催化剂表面化学吸附水 的活化。Ce 4+和H 2 O 2的添加 由于最大的BET表面积和最高的Oα或/和 $ {\ rm {O} ^ {\ prime}} _ {\ rm \ alpha} $ ，因此显示出协同的促进作用。与传统的Ce 20 W 10 Ti 100 O z –Ce 3+：Ce 4+ = 17.5：2.5 + H 2 O 2相比，Ce 20 W 10 Ti 100 O z –Ce 3+具有最高的催化活性（图5）。