The solid superacid TiO₂-ZrO₂-SO₄²⁻-supported 20 wt.% CeO₂ catalyst (20CeO₂/Ti-Zr-S) was synthesized for selective catalytic reduction of NO with NH₃ (NH₃-SCR). The NH₃-SCR performance was significantly enhanced by the construction of strong acid sites on the surface of 20CeO₂/Ti-Zr-S and over 96% NO conversion was obtained at 225–425 °C. Meanwhile, the strong interaction between solid superacid and CeO₂ resulted in excellent redox property and abundant surface oxygen species. Furthermore, the NH₃-SCR reaction over 20CeO₂/Ti-Zr-S catalyst mainly followed the Langmuir-Hinshelwood mechanism at low-temperature (250 °C). The M-NO₂ (M = Ce, Ti, Zr) nitrate compounds, monodentate and bridging nitrates were the crucial intermediates in Langmuir-Hinshelwood mechanism. In addition, amide (–NH₂) species were available at 350 °C over 20CeO₂/Ti-Zr-S catalyst, which facilitated the high-temperature NH₃-SCR activity via Eley-Rideal pathway.

合成了固体超强酸TiO ₂ -ZrO ₂ -SO ₄ ^2-负载的20 wt。％CeO ₂催化剂（20CeO ₂ / Ti-Zr-S），用于用NH ₃（NH ₃ -SCR）选择性催化还原NO 。通过在20CeO ₂ / Ti-Zr-S表面上形成强酸位，可以显着提高NH ₃ -SCR性能，并且在225–425°C时获得超过96％的NO转化率。同时，固体超强酸与CeO ₂之间的强相互作用导致优异的氧化还原性能和丰富的表面氧物种。此外，在20CeO _2上的NH ₃ -SCR反应/ Ti-Zr-S催化剂在低温（250°C）下主要遵循Langmuir-Hinshelwood机理。M-NO ₂（M = Ce，Ti，Zr）硝酸盐化合物，单齿硝酸盐和桥连硝酸盐是Langmuir-Hinshelwood机理的关键中间体。此外，在20CeO ₂ / Ti-Zr-S催化剂上，可在350°C的温度下使用酰胺（–NH ₂）物种，这有助于通过Eley-Rideal途径提高高温NH ₃ -SCR的活性。