Dry reforming of methane (DRM) can utilize carbon dioxide, a greenhouse gas, to produce syngas, a useful precursor to synthetic fuel. However, coking that occurs during DRM can lead to catalyst deactivation, and has made DRM less commercially attractive. Experimental data will be presented that show that: 1) Carbon deposits on a Ni catalyst produced during a DRM reaction can be oxidized by CO<sub>2</sub>; 2) There are two principal forms of coke produced during DRM--- two-dimensional (2D) graphite and one-dimensional (1D) carbon nanotubes; 3) Significant accumulation of 2D carbon, which can completely deactivate the Ni catalyst, is only seen under CO<sub>2</sub>-deficient conditions; 4) After 30 minutes under our DRM reaction conditions, the main form of coke present on the Ni catalyst is 1D carbon; 5) Further, DRM activity does not change significantly over this time period, implying a steady-state involving carbon deposition and carbon oxidation; 6) The CO produced as a result of oxidation of coke contributes to the DRM yield. The implication of these results for the deactivation of DRM catalysts will be discussed.

Insights into coking in the dry reforming of methane

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