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Synthesis of Ordered Mesoporous Molecular Sieve-Supported Cobalt Catalyst via Organometallic Complexation for Propane Non-Oxidative Dehydrogenation
oleh: Yanliang Zhai, Lisha Chen, Ruihan Wu, Xianggang Lu, Jun Wang, Gaolong Li, Bicheng Tang, Wei Zhang, Shaolong Zhang, Zhijun Li
Format: | Article |
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Diterbitkan: | MDPI AG 2024-06-01 |
Deskripsi
Co-based catalysts have shown great promise for propane dehydrogenation (PDH) reactions due to their merits of environmental friendliness and low cost. In this study, ordered mesoporous molecular sieve-supported CoO<sub>x</sub> species (CoO<sub>x</sub>/Al-SBA-15 catalyst) were prepared by one-step organometallic complexation. The catalysts show worm-like morphology with regular straight-through mesoporous pores and high external specific surface area. These typical features can substantially enhance the dispersion of CoO<sub>x</sub> species and mass transfer of reactants and products. Compared with the conventional impregnation method, the 10CSOC (10 wt.% Co/Al-SBA-15 prepared by the organometallic complexation method) sample presents a smaller CoO<sub>x</sub> size and higher Co<sup>2+</sup>/Co<sup>3+</sup> ratio. When applied to PDH reaction, the 10CSOC delivers higher propane conversion and propylene selectivity. Under the optimal conditions (625 °C and 4500 h<sup>−1</sup>), 10CSOC achieves high propane conversion (43%) and propylene selectivity (83%). This is attributed to the smaller and better dispersion of CoO<sub>x</sub> nanoparticles, more suitable acid properties, and higher content of Co<sup>2+</sup> species. This work paves the way for the rational design of high-performance catalysts for industrially important reactions.