کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
155951 | 456915 | 2011 | 9 صفحه PDF | دانلود رایگان |

A honeycomb monolith with a Pt/γ-Al2O3 catalyst has been tested in order to highlight and explain the bifurcation behavior of catalytic methane (partial) oxidation under process conditions, elucidating the light off behavior. With CH4/O2=1 (rich mixture) and different heating/cooling policies it has been shown that hysteresis occurs only after complete ignition of the catalyst. The dependence of hysteresis on the feed composition was studied, showing that it disappears with lean mixtures, has its maximum for slightly richer than stoichiometric mixtures and then decreases with much richer composition. At the same time, the ignition temperature lowers with increasing CH4/O2 ratio. Finally, we suggest a procedure to decrease the ignition temperature by taking advantage of the hysteretic behavior, gradually tuning the feed composition, with the only limit given by the thermal insulation capabilities.
Journal: Chemical Engineering Science - Volume 66, Issue 24, 15 December 2011, Pages 6341–6349