| Abstract
| - Petroleum cokes are widely used in cement plants for energy generation. Because of their verylow volatile content, the physicochemical processes occurring during their combustion should bemainly controlled by heterogeneous reactions. The reactivities of some petroleum cokes towardNO between 800 and 1000 °C have been characterized through experiments in an entrainedflow reactor. These carbonaceous materials exhibit very high reactivities toward NO. Theircapacity to reduce NO concentration in the surrounding gas is significant, so that this reactioncan have a significant impact in terms of NO emissions resulting from their combustion. Theinfluence of surface area and of the heavy metal content on surface reactivity was tested. As itwas the case for carbon−oxygen reaction, the surface measured by mercury porosimetry seemsto be a good parameter to calculate surface reaction rate. No correlation was found betweencalcium or iron content and NO−carbon reaction rate. As for the reaction of petroleum coke withoxygen, vanadium appears to have a catalytic effect on the reduction reaction of NO with carbon.
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