Ting-Ting Zhang,Jian-Dong Song,Jia-Xi Chen,Ai-Ping Jia,Meng-Fei Luo,Ji-Qing Lu
A series of supported CoCr 2 O 4 /TUD-1 catalysts with different loadings were prepared and tested for catalytic combustion of dichloromethane, in order to investigate the effect of particle size on the catalyst properties and related catalytic behaviors. It was found that the supported catalyst with low content of CoCr 2 O 4 had smaller CoCr 2 O 4 particles compared to that with high content, as revealed by the XRD results. Consequently, the changes in particle size altered the surface composition of the catalyst, as the small particles contained higher content of surface Cr 6+ species compared to the large ones. The enrichment of Cr 6+ species improved catalyst reducibility and surface acidity, which synergistically governed the observed catalytic behaviors. As a reuslt, the 5CoCr 2 O 4 /TUD-1 catalyst had the highest reaction rate of 64.8 × 10 −7 molDCM g −1 CoCr2o4s −1 , due to its best reducibility and highest surface acidity.
Jing Bai,Wencheng Chen,Freeman Bwalya Kabwe,Xutao Shang,Guozhen Lin,Qian Jiang,Chenguang Wang
Amid growing global energy demands and the imperative to reduce carbon emissions, sustainable aviation fuel (SAF) production via Fischer–Tropsch (FT) synthesis has emerged as a pivotal solution. This study focuses on enhancing the selectivity of C8–C16 hydrocarbons for jet fuel through the integration of mesopore confinement effects and acid hydrocracking by developing novel Co/M-TUD-1 catalysts with a uniform, continuous three-dimensional mesoporous architecture. Utilizing sol–gel and melt infiltration methods for catalyst preparation and incorporating metals such as Al, Zr, La, and Ce, we explored how different supports influence FT synthesis outcomes. Characterization techniques, including N2 physisorption, H2-TPR, XRD, NH3-TPD, and Py-FTIR, were employed to understand the physicochemical properties of these catalysts. Experimental results demonstrated significant improvements in jet fuel selectivity, achieving up to 51.3% selectivity and a productivity of 174.7 g/kgcat/h with the Co/Al-TUD-1 catalyst. Further optimization through adjustment of reaction conditions confirmed the potential for industrial-scale SAF production, offering a cleaner, more sustainable approach to addressing fossil fuel shortages.
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