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Optimization of Cr/SBA-15 catalysts for CO2-Assisted oxidative dehydrogenation of propane to propylene
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DOI：10.1007/s10934-025-01886-8.png)
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Abstract
En 中文
Cr/SBA-15 catalysts were optimized for CO2-assisted oxidative dehydrogenation of propane (ODH-CO2) using a Taguchi L9(3 & sup3;) design spanning temperature (550-650 degrees C), Cr loading (5-10 wt %), and W/F (0.010-0.020 g min mL(-)& sup1;). Signal-to-noise analysis and ANOVA ranked factor importance as temperature >> W/F > Cr loading. The confirmation run at 600 degrees C, 7 wt % Cr, and W/F = 0.015 achieved 37.1% propane conversion with 84.0% propylene selectivity. Characterization linked this window to an intermediate loading that preserved SBA-15 mesostructural order and maximized redox-accessible chromate species. XANES linear-combination fitting showed that the 7 wt % catalyst retained a higher Cr-6(+) fraction in both fresh and spent states than the 5 or 10 wt % analogues, while H-2-TPR revealed the largest reducible population at 7 wt %. The catalytic and spectroscopic evidence supports a Mars-van Krevelen mechanism operating on dispersed Cr-6(+)=O sites, with CO2 re-oxidizing reduced Cr to sustain selective ODH. At higher temperatures and/or loadings, increased reduction and aggregation shifted products toward cracking and deep oxidation. Integration of DOE with spectroscopy thus identified an intermediate Cr loading/contact-time regime on SBA-15 that optimized redox selectivity and enhanced process-relevant performance in CO2-assisted ODH of propane.
Keywords:
Oxidative dehydrogenation
Taguchi design
Propylene
CO2
Cr/SBA-15
Journal
IF:
3.2
Papers:
154
Citations:
5.0K