A series of pure CeO₂, ZrO₂, and CeZrO_x mixed metal oxide catalysts were prepared by a wetness impregnation method and were applied to the dehydrogenation of propane to propylene at 500°C and 0.1 MPa. The prepared catalysts were characterized by thermal gravimetric analysis (TGA), Brunauer, Emmett, and Teller (BET), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopes (TEM), Raman spectroscopy, and H₂-TPR. It was observed that the zirconium content of the solid solution of the mixed metal oxide catalyst was 5%–25%, while the zirconium content of the material with phase segregation was higher (50%). The addition of zirconium was proven to decrease the oxygen vacancy concentration on the catalyst surface and change the intensity of (111) crystal of cerium oxide in the catalysts. Among the prepared catalysts, the Ce_0.90Zr_0.10O_x catalyst with the maximum strength of the (111) crystal plane of cerium oxide exhibited the better catalytic oxidation performance for the dehydrogenation of propane to propylene. Compared with ZrO₂ in the blank experiment, the average propane conversion and propylene selectivity of the Ce_0.90Zr_0.10O_x catalyst were increased by 10.78% and 17.95%, respectively.

中文翻译：

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结构变化对铈-锆催化剂上丙烷氧化脱氢的影响

采用浸渍法制备了一系列纯CeO ₂、ZrO ₂和CeZrO _{x混合金属氧化物催化剂，并将其应用于500℃和0.1 MPa条件下丙烷脱氢制丙烯。}通过热重分析（TGA）、Brunauer、Emmett和Teller（BET）、X射线光电子能谱（XPS）、X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜对制备的催化剂进行了表征。 (TEM)、拉曼光谱和 H ₂-TPR。据观察，混合金属氧化物催化剂固溶体的锆含量为5%~25%，而相分离材料的锆含量更高（50%）。事实证明，添加锆可以降低催化剂表面的氧空位浓度，改变催化剂中氧化铈(111)晶体的强度。在制备的催化剂中，氧化铈(111)晶面强度最大的Ce _0.90 Zr _0.10 O _{x催化剂对丙烷脱氢制丙烯具有较好的催化氧化性能。}与空白实验中的ZrO ₂相比，Ce _{0.90的平均丙烷转化率和丙烯选择性}Zr _0.10 O _x催化剂分别提高了10.78%和17.95%。