Active coke: Carbonaceous materials as catalysts for alkane dehydrogenation

作者：McGregor James^*; Huang Zhenyu; Parrott Edward P J; Zeitler J Axel; Nguyen K Lien; Rawson Jeremy M; Carley Albert; Hansen Thomas W; Tessonnier Jean Philippe; Su Dang Sheng; Teschner Detre; Vass Elaine M; Knop Gericke Axel; Schloegl R; Gladden Lynn F

来源：Journal of Catalysis, 2010, 269(2): 329-339.

DOI：10.1016/j.jcat.2009.11.016

• Vanadia catalysts
• Carbon nanofibres
• THz time domain spectroscopy
• Coke
• Transmission electron microscopy
• Butane dehydrogenation
• X-ray absorption spectroscopy

The catalytic dehydrogenation (DH) and oxidative dehydrogenation (ODH) of light alkanes are of significant industrial importance. In this work both carbonaceous material deposited on VO(x)/Al(2)O(3) Catalysts during reaction and unsupported carbon nanofibres (CNFs) are shown to be active for the dehydrogenation of butane in the absence of gas-phase oxygen. Their activity in these reactions is shown to be dependent upon their structure, with different reaction temperatures yielding structurally different coke deposits. Terahertz time-domain spectroscopy (THz-TDS), among other techniques, has been applied to the characterisation of these deposits - the first time this technique has been employed in coke studies. TEM and other techniques show that coke encapsulates the catalyst, preventing access to VO(x) sites, without a loss of activity. Studies on CNFs confirm that carbonaceous materials act as catalysts in this reaction. Carbon-based catalysts represent an important new class of potential catalysts for DH and ODH reactions.

• 出版日期2010-2-5