STUDY ON COKING AND DEACTIVATION OF VIRGIN NAPHTHA AROMATIZATION CATALYST

The coking and deactivation of virgin naphtha aromatization catalyst are studied on isothermal reactor. The impact of coking on catalyst physical properties, acidity and activity as well as the effect of reactor temperature and reaction time length on catalyst coking are investigated The results indicate that the catalyst pore volume,specific surface area and strong and weak acids are reduced in different degrees with incremental coking on catalyst, indicating that the coke on the catalyst has not only blocked the access pore paths but also covered the catalyst acidic site, which results in the catalyst deactivation. With extension of reaction time, the coking tends to be saturated and a little increase in coking will lead to a significant deterioration of catalyst performances. The increase of reaction temperature will accelerate the coking rate of catalyst.