CeO₂‐CrO_y loaded on γ‐Al₂O₃ was investigated in this work for the oxidative dehydrogenation (ODH) of propane under oxygen‐free conditions. The ODH experiments of propane were conducted in a fluidized bed at 500°C‐600°C under 0.1 Mpa. The prepared catalyst was characterized by N₂ adsorption‐desorption measurements, H₂‐temperature‐programmed reduction, O₂‐temperature‐programmed desorption, NH₃‐temperature‐programmed desorption, x‐ray photoelectron spectroscopy, and x‐ray diffraction. The change in the selectivity of propylene resulted from the thermal cracking of the propane and the competition for lattice oxygen in the catalyst between propylene formation and propane and propylene combustion. Therefore, to achieve higher propylene yield in the industry, the reaction temperature should be 550°C‐575°C for the 17.5Cr‐2Ce/Al catalyst. The results of H₂‐TPR (from 0.2218 mmol/g‐0.3208 mmol/g) revealed that the addition of CeO₂ can enhance the oxygen capacity of CrO_y. Compared with that for 17.5Cr/Al, the conversion can be enhanced from 22.4% to 28.5% and the selectivity of propylene can be improved from 72.2% to 75.9% for the 17.5Cr‐2Ce/Al catalyst. In addition, CeO₂ can inhibit the evolution of lattice oxygen (O²⁻) to electrophilic oxygen species (O₂⁻), causing the average CO_x (CO and CO₂) selectivity to decrease from 9.64% to 6.31%.

中文翻译：

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CeO2-CrOy /γ-Al2O3氧化还原催化剂，用于丙烷氧化脱氢为丙烯

的CeO ₂ -CrO _ý装上的γ-Al ₂ ö ₃在这项工作中用于丙烷无氧的条件下氧化脱氢（ODH）进行了研究。丙烷的ODH实验在流化床中，0.1 Mpa，500°C-600°C下进行。通过N ₂吸附-解吸测量，H _2-温度程序还原，O _2-温度程序解吸，NH _3来表征所制备的催化剂。程序升温解吸，X射线光电子能谱和X射线衍射。丙烯的选择性变化是由丙烷的热裂化和催化剂在丙烯形成与丙烷和丙烯燃烧之间的晶格氧竞争引起的。因此，为了在工业中获得更高的丙烯收率，对于17.5Cr-2Ce / Al催化剂，反应温度应为550°C-575°C。H ₂ -TPR（0.2218 mmol / g-0.3208 mmol / g）的结果表明，添加CeO ₂可以增强CrO _y的氧容量。与17.5Cr / Al相比，对于17.5Cr-2Ce / Al催化剂，转化率可以从22.4％提高到28.5％，丙烯的选择性可以从72.2％提高到75.9％。此外，铈₂可以抑制晶格氧的演变（O ^2-），以电性氧物质（O ₂ ^- ），导致平均CO _X（CO和CO ₂）的选择性降低从9.64％至6.31％。