writer：CAO Lei, DAI Peng-Cheng*, LIU Dan-Dan, GU Xin, LI Liang-Jun, ZHAO Xue-Bo*
keywords：carbonyl group；graphite sheet；oxidative dehydrogenation；propane；propene
source：期刊
specific source：Journal of Inorganic Materials，2019, 34 (11): 1187-1192.
Issue time：2019年
Using earth abundant graphite sheets as raw material, carbonyl groups modified graphite sheets were prepared via a simple gaseous-phase oxidation strategy. As-prepared carbonyl groups modified graphite sheets catalyzed oxidative dehydrogenation of propane (ODHP) to propene with high target product selectivity: the product contains 73.9% propene and 13% ethene when the propane conversion is 12.4%. Its high target product selectivity was much better than carbon nanotube that treated by gaseous-phase oxidation, and could compare favorably with the state-of-the-art hexagonal boron nitride catalysts. After 48 h stability test at 505 degrees C, there was no obvious variation in the propane conversion and olefins selectivity, demonstrating the remarkable stability of the carbonyl groups modified graphite sheets catalysts. The characterization results revealed that gaseous-phase oxidation didn''t destroy the structure of graphite sheets and inherit the nature of high thermal stability against oxidation. The content of carbonyl groups increased significantly after gaseous-phase oxidation treatment. As active sites, carbonyl groups could abstract the hydrogen atoms from propane and form hydroxyl groups. Hydroxyl groups could react with oxygen atom and regenerate to carbonyl group. The high target product selectivity can be attributed to the controllable reaction style on catalyst surface. Furthermore, graphite sheets are rich in resource and low cost. As a catalyst, it would promote the industrialization of ODHP.