Abstract Oxidative dehydrogenation of propane (ODP) is an intriguingly alternative approach for presently industrial propene manufacture. However, the high temperature (>500 °C) would aggravate the deep oxidation of propene and catalyst deactivation. Co3O4 catalyst prepared by using ZIF-8 support possesses tunable morphology, crystallite size and surface area, affording low-temperature (175 °C) propane conversion catalyst. Loose flake-like morphology with the smaller crystallite sizes and the larger surface area could significantly lower reaction temperature. At given propene yield, more propane conversion (21.1%) indicated that propene combustion occurred, and lower reaction temperatures contribute to boosting propene yield. The higher catalytic activity could be ascribed to easier reducibility of Co3+, the higher concentration of surface Co3+ and more surface content of lattice Co O bond. Moreover, the Co3O4-500 catalyst displays excellent thermostability after a 20 h time on stream at 250 °C.

中文翻译：

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用于丙烷低温氧化脱氢的高活性稳定 Co3O4 催化剂

摘要 丙烷氧化脱氢 (ODP) 是目前工业丙烯制造的一种有趣的替代方法。然而，高温（> 500°C）会加剧丙烯的深度氧化和催化剂失活。使用 ZIF-8 载体制备的 Co3O4 催化剂具有可调的形貌、微晶尺寸和表面积，可提供低温 (175 °C) 丙烷转化催化剂。具有较小微晶尺寸和较大表面积的松散片状形态可以显着降低反应温度。在给定的丙烯产率下，更高的丙烷转化率 (21.1%) 表明发生了丙烯燃烧，而较低的反应温度有助于提高丙烯产率。较高的催化活性可归因于 Co3+ 更容易还原，表面 Co​​3+ 浓度越高，晶格 Co O 键的表面含量越高。此外，Co3O4-500 催化剂在 250°C 下运行 20 小时后显示出优异的热稳定性。