Spatially and Temporally Resolving Concentration and Temperature Profiles within a Fresh and a Thermally-Aged Monolith Catalyst
During temperature programmed oxidation experiments, the data show that conversion of propylene began at the outlet, and a reaction front generated at the rear of the monolith traveled upstream, as a moving reaction zone, thereby creating a temperature wave pattern since the reaction is exothermic. The conversion was always complete downstream of this reaction zone at any point along the catalyst. When the reactor was cooled, the conversion of propylene started to drop, accompanied by a similar temperature wave pattern that traveled in the opposite direction (from upstream to downstream) and was attributed to a phenomenon known as wrong-way behavior.
Finally, thermally aging the catalyst led to a slower and more localized moving hot zone.
School:University of Waterloo
School Location:Canada - Ontario
Source Type:Master's Thesis
Keywords:ir thermography spacims temperature gradients concentration propylene oxidation spatial patterns temporal catalysis reaction measurement chemical engineering
Date of Publication:01/01/2008