The temperature hysteresis phenomena is defined as the fact that the parameter (reaction rate or conversion) measured in the course of increasing temperature mis-matches the same parameter measured on decreasing temperature in the reaction [1], and this phenomena has been mostly reported in the reaction of methane catalytic partial oxidation with Pt, Pd, Ce and Ni catalyst, which is widely accepted as the consequence of the exothermic nature of hydrocarbon oxidation reactions [2]. Understanding the flame-out temperature and ignition temperature, some measures could be taken to make the reaction occur and proceed at lower temperature, thus reducing energy consumption [3]. Temperature hysteresis is also observed in the DRM reaction catalyzed by Ni/SBA-15 catalyst in the present work. As shown in Fig.1a, the yield of H2 shows a hysteresis ring with varying temperature. It exhibits that the ignition temperature is about 450 oC, with an abrupt yield about 7.5 %. With the temperature increasing to 500 oC, the yield of H2 reaches 13.6%. When decreasing the temperature, the corresponding flameout temperature is about 295 oC, where the H2 yield turns to 0. The yield of CO displays the same ring as observed in Fig.1 b.

Temperature hysteresis in dry reforming of methane on Ni/SBA-15 catalyst

2019 Spring National Meeting

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