Novel CrZrO_x catalysts were designed and synthesized by the co-precipitation method and the first time used for selective catalytic reduction of NO_x with NH₃ (NH₃-SCR). The promotional effect of ZrO₂ on Cr₂O₃ catalysts was investigated. The SCR performance of Cr₂O₃ was significantly enhanced with the appropriate addition of ZrO₂ in CrZrO_x, owing to the formation of solid solution structure and Cr-O-Zr conjunction bonds. Among the tested CrZrO_x catalysts, the catalyst with Cr:Zr=1:1 showed the optimal NO_x removal efficiency at low temperatures, with the highest NO removal efficiency of 97.5% at 180 °C , excellent SO₂ and H₂O resistance at 300 °C with 50 ppm SO₂ and 5% H₂O. It appears that the reaction mechanisms followed the Langmuir-Hinshelwood model and NH₃*, NH₄^+*, monodentate nitrates and nitrites were the major active intermediate species. The structure change modified the surface properties of the CrZrO_x catalyst, increasing the concentrations of the acid sites, surface adsorbed oxygen O_a and Cr⁶⁺, which were responsible for the enhancement of SCR performance.

通过共沉淀法设计合成了新型CrZrO _x催化剂，首次用于NH ₃（NH ₃ -SCR）选择性催化还原NO _x。研究了ZrO ₂对Cr ₂ O ₃催化剂的促进作用。Cr的SCR性能₂ ö ₃与适当的加入的ZrO被显著增强₂在CrZrO _X，由于固溶体结构和Cr-O-Zr的结合键的形成。在测试的CrZrO _x催化剂中，Cr：Zr = 1：1的催化剂显示出最佳的NO _x低温下的脱氮效率，在180°C时具有最高的NO脱除率，在50 ppm SO ₂和5％H ₂ O的条件下，在300°C时具有极好的SO ₂和H ₂ O耐受性。遵循Langmuir-Hinshelwood模型，并且NH ₃ *，NH ₄ ^{+ *}，单齿硝酸盐和亚硝酸盐是主要的活性中间体。结构变化修改CrZrO的表面特性_X催化剂，增加了酸性部位的浓度，表面吸附的氧O_一和Cr ⁶⁺，这是负责的SCR性能的提高。