The effect of varying the metal ratio in a chromium molybdate catalysts for the oxidative dehydrogenation of n-octane

Add time:07/25/2019    Source:sciencedirect.com

Chromium molybdate catalysts with varying Cr/Mo ratios were synthesized by co-precipitation. The catalysts were characterized using XRD, Raman spectroscopy, TPR, BET surface area measurements, ICP-OES and HR-TEM. X-ray diffraction and Raman studies revealed that the dominant phase in the catalysts was Cr2(MoO4)3. Furthermore, Raman spectroscopy showed that excess Mo and Cr exist as MoO3 and Cr2O3 phases, respectively. The catalytic activation of n-octane was investigated from 350 to 550 °C, in a continuous flow fixed-bed reactor with the GHSV fixed at 4000 h−1. Catalytic testing revealed that the conversion of n-octane and product selectivity varied with Cr/Mo ratio. At 6% isoconversion (350 °C), the stoichiometric catalyst, i.e. the catalyst with a Cr/Mo ratio of 0.67, produced octenes and carbon oxides as the major products with a selectivity of 51% and 49%, respectively.

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