Citation: LI Jian-Mei, LIU Jian, REN Li-Wei, LIU Qing-Long, ZHAO Zhen, WEI Yue-Chang, DUAN Ai-Jun, JIANG Gui-Yuan. Selective Oxidation of Ethane to Aldehydes over Potassium-Promoted SBA-15-Supported Molybdenum Oxide Catalysts[J]. Acta Physico-Chimica Sinica, ;2014, 30(9): 1736-1744. doi: 10.3866/PKU.WHXB201407091 shu

Selective Oxidation of Ethane to Aldehydes over Potassium-Promoted SBA-15-Supported Molybdenum Oxide Catalysts

1.
State Key Laboratory of Heavy Oil, College of Science, China University of Petroleum, Beijing 102249, P. R. China

Received Date: 16 April 2014
Available Online: 9 July 2014
Fund Project:

Potassium-modified SBA-15-supported molybdenum oxide catalysts were prepared using a twostep impregnation method. The physical and chemical properties of the catalysts were characterized using N2- adsorption-desorption, X-ray diffraction (XRD), transmission electron microscope (TEM), UV-visible (UV-Vis) spectroscopy, Raman spectroscopy, NH₃ temperature-programmed desorption (NH₃-TPD), CO₂ temperatureprogrammed desorption (CO₂-TPD), and H₂ temperature-programmed reduction (H₂-TPR). The results showed that potassium addition resulted in the formation of new potassium molybdates, and the states of molybdenum species varied with changes in the K/Mo molar ratio. The addition of potassium to Mo_0.75/SBA-15 effectively improved the activity of catalysts and the selectivity to the total aldehydes (formaldehyde, acetaldehyde, and acrolein), especially for acetaldehyde in the selective oxidation of ethane. The turn-over frequency (TOF) and product selectivity depended strongly on the potassium content. The maximum selectivity and yield of aldehydes were obtained by varying the K/Mo molar ratio. At 575 ℃, the maximum yield of aldehydes reached 8.5%(molar fraction) over K_0.25-Mo_0.75/SBA-15 catalyst. The formation of new potassium-molybdates promoted the activities and selectivities of the catalysts.
- Selective oxidation of ethane,
- K-modified catalyst,
- Molybdenum oxide,
- Aldehyde,
- SBA-15 mesoporous material
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