Abstract:

A coked equilibrium catalyst was obtained from a commercial MTO unit and tested for MTO performance at lab-scale. It was found that the catalytic lifetime of the coked catalyst was shortened and no improvement was made on the initial selectivity of ethylene and propylene. The coke distribution was regarded as the cause and further proved by lab simulation of the coked catalyst using physically mixed catalyst samples from catalysts with different coke loadings. Based on the preliminary TGA testing results of the coked catalysts, the peak temperature of weight loss exhibited good correlation with the catalytic lifetime.

Key words: MTO, catalyst, regeneration, carbon distribution