The self-sustained combustion of carbon monoxide (CO) has been studied over the CuCe_0.75Zr_0.25O_δ catalyst by sol–gel method, and compared with the CuCe_0.75Zr_0.25O_δ(H) and Ce_0.75Zr_0.25O_δ to investigate sensitivity of different active sites, such as dispersed CuO, Cu–Ce and Ce–Zr solid solution. The CuCe_0.75Zr_0.25O_δ(H) is obtained via CuCe_0.75Zr_0.25O_δ sonicated in nitric acid to remove surficial CuO species, and the Ce_0.75Zr_0.25O_δ is prepared as the reference catalyst. Using the temperature programmed oxidation of CO together with an infrared camera (CO-TPO + FLIR), the catalytic activity for CO self-sustained combustion is determined not only by the ignition temperatures, following the decreasing order CuCe_0.75Zr_0.25O_δ (81 °C) > CuCe_0.75Zr_0.25O_δ(H) (131 °C) > Ce_0.75Zr_0.25O_δ (167 °C) at the flow rate of 200 mL/min, but also by corresponding limits of lean combustion (equivalence ratio Φ) of 0.06–0.09, 0.10–0.13, 0.24–0.37, respectively, under the flow rate of 100–1000 mL/min. The M-K mechanism, in which adsorbed CO reacts with lattice oxygen, is crucial for all the catalysts via temperature programmed surficial reaction and in situ infrared analysis (TPSR + DRIFT). The sensitivity of active sites as follows: well-dispersed CuO > Cu–Ce solid solution > Ce–Zr solid solution. As rate-determining step for CO self-sustained combustion, CO is preferentially adsorbed on surficial dispersed CuO to yield carbonyls, and then the carbonyls interact with lattice oxygen to form CO₂ release. CO is secondly adsorbed on the surficial oxygen of copper and cerium sites in solid solution to yield carbonates. The carbonates formed are more stable and thus CO₂ is produced at the lower rate than carbonyls, indicating that the solid solution is less active than dispersed CuO. Exposed Ce³⁺ favors to form vacancies on the Cu–Ce solid solution surface, which is beneficial to adsorbing both CO and O₂, thus presenting the higher activity than Ce–Zr solid solution.

（CO）一氧化碳的自持燃烧已被研究过CuCe _0.75锆_0.25 ö _δ由溶胶-凝胶法催化剂，并与CuCe相比_0.75锆_0.25 ø _δ（H）和Ce _0.75 Zr的_0.25 Ò _δ到研究不同活性位点的敏感性，例如分散的CuO，Cu-Ce和Ce-Zr固溶体。所述CuCe _0.75锆_0.25 ø _δ（H）通过CuCe获得_0.75的Zr _0.25 ö _δ超声处理在硝酸以去除表层的CuO物种，和Ce的_0.75 Zr的_0.25 ø _δ准备作为参考催化剂。使用温度编程与红外照相机一起CO的氧化（CO-TPO + FLIR），对于CO自持燃烧的催化活性被确定为不是仅由点火温度，以下递减顺序CuCe _0.75锆_0.25 ø _δ（81 ℃）> CuCe _0.75锆_0.25 ø _δ（H）（131℃）> CE _0.75锆_0.25 ö _δ（167°C）在200 mL / min的流速下，但在100–100 mL的流速下，也分别受到稀薄燃烧（当量比Φ）的限制，分别为0.06-0.09、0.10-0.13、0.24-0.37。 1000 mL /分钟 MK机理（其中吸附的CO与晶格氧反应）通过程序升温表面反应和原位红外分析（TPSR + DRIFT）对于所有催化剂都是至关重要的。活性部位的敏感性如下：分散良好的CuO> Cu-Ce固溶体> Ce-Zr固溶体。作为CO自持燃烧的速率决定步骤，CO优先吸附在表面分散的CuO上以生成羰基，然后羰基与晶格氧相互作用形成CO _2。释放。其次，将CO吸附在固溶体中铜和铈位点的表面氧上，以生成碳酸盐。所形成的碳酸盐更稳定，因此产生的CO ₂的速率低于羰基的速率，这表明固溶体的活性低于分散的CuO。暴露的Ce ³⁺有助于在Cu–Ce固溶体表面形成空位，这有利于同时吸附CO和O ₂，因此比Ce–Zr固溶体具有更高的活性。