Coke Minimization during Conversion of Biogas to Syngas by Bimetallic Tungsten Nickel Incorporated Mesoporous Alumina Synthesized by the One Pot Route

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Dry re-forming of methane with CO 2 was investigated over bimetallic W and Ni incorporated mesoporous alumina catalysts prepared by the one-pot sol–gel route. Powdered materials were thoroughly characterized (N 2 physisorption, XRD, XPS, SEM-EDX, TGA-DTA, TPH) prior to and after catalytic runs performed at 600 and 750 °C. High surface area W–Ni incorporated mesoporous alumina catalysts ( S BET = 178–192 m 2 /g) synthesized in this work showed excellent performance for the conversion of model biogas to synthesis gas. The Ni–W containing materials exhibited high catalytic activity, which was maintained throughout 150 h of time-on-stream (TOS) long-term operation at 750 °C. Increase of the W loading (0–10–15 wt %) at fixed nickel amount (5 wt %) resulted in prevented deactivation of the catalyst, most prominent at 600 °C, and minimization of coke formation on the surface of the catalyst. Tungsten incorporation was thus proven to significantly enhance and stabilize the overall catalyst performance.