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Revealing the ameliorating effect of chromium oxide on a carbon nanotube catalyst in propane oxidative dehydrogenation

机译：揭示氧化铬对丙烷氧化脱氢的碳纳米管催化剂的改善作用

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Oxygenized multi-walled carbon nanotubes were modified with chromium oxide and applied in propane oxidative dehydrogenation. A propylene selectivity of 84.0% was obtained at a propane conversion of 19.8% on a Cr-1.5 wt% sample. The beneficial effect of chromium was studied by integrated techniques. X-ray photoelectron spectroscopy, and FT-IR results show that surface oxygen groups were greatly optimized as a result of chromium doping. It was also revealed that chromium improves the oxygen chemisorption properties of the catalyst, whereas the propylene desorption ability was enhanced. The superior catalytic performance was ascribed to the synergistic effect between chromium and CNTs. Moreover, as signaled from in situ FT-IR experiments, surface carbonyl (C=O) groups were detected to be the active sites in PODH reaction and the presence of chromium greatly facilitates C=O restoration, which as a whole determines the catalytic performance.
机译：氧化的多壁碳纳米管用氧化铬改性，并用于丙烷氧化脱氢。在Cr-1.5 wt％样品上丙烷转化率为19.8％时，丙烯选择性为84.0％。通过综合技术研究了铬的有益作用。 X射线光电子能谱和FT-IR结果表明，由于掺杂了铬，极大地优化了表面氧基团。还发现铬改善了催化剂的氧化学吸附性能，而丙烯的解吸能力增强了。优异的催化性能归因于铬和碳纳米管之间的协同作用。此外，从原位FT-IR实验中可以看出，表面羰基（C = O）是PODH反应中的活性位点，铬的存在大大促进了C = O的还原，总体上决定了催化性能。

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