An Efficient Cr-TUD-1 Catalyst for Oxidative Dehydrogenation of Propane to Propylene with CO2 as Soft Oxidant
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A series of Cr-TUD-1 catalysts with various loadings of chromium (3, 5, 7, and 9 wt%) were prepared by microwave irradiation and explored for oxidative dehydrogenation of propane to propylene utilizing CO2 as soft oxidant. The microwave irradiation reduced the synthesis time and the resulting Cr-TUD-1 catalysts exhibited a high specific surface area of more than 600 m2 g−1. The synthesized catalysts were characterized by various techniques including XRD, XPS, TEM, UV–vis DRS, BET surface area, and pore size distribution to understand the physicochemical properties, and to correlate with the catalytic activity. Among various compositions, the 7% Cr-TUD-1 catalyst exhibited a high propane conversion (~ 45%) with better propylene product selectivity (~ 75%). The Cr-TUD-1 catalyst was also found to be quite stable up to 8 h of time-on-stream investigated. As revealed by the characterization techniques, the inter-convertible Cr6+ to Cr3+/2+ species are very crucial for the observed better catalytic activity of these materials. The TUD-1 enables to encapsulate the chromium nanoparticles in the porous silica structure with high dispersion which help in maintaining the better catalytic performance.
KeywordsCr-TUD-1 Oxidative dehydrogenation Carbon dioxide utilization Soft oxidant Propane Propylene
The authors thank Inha University and the National Research Foundation of Korea (NRF) for financial grant funded by the Korean Government (MEST) (NRF-2016M3D3A1A01913275). BMR thanks Korea Federation of Science and Technology (KOFST) for the offer of Invitation Scientist position under the Brain Pool program.
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Conflict of interest
The authors declare no conflict of interest.
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