The aromatization of the butylenes in C4 liquefied petroleum gas (LPG) over a nano-sized ZSM-5 zeolite catalyst

denoted DLG-1

was studied at a mild temperature. Emphasis was given to the influence of feed impurities and reaction conditions

such as reaction temperature

pressure

weight hourly space velocity of LPG(WHSV LPG) on the activity and stability of the aromatization catalyst. The results showed that

both diene and alkaline nitrogen-containing compounds had negative influence on the aromatization stability of the catalyst. Comparatively

the negative influence of the alkaline nitrogen-containing compounds (mainly in the manner of strong chemisorption on the acid sites) was much stronger than that of diene. On the other hand

reaction temperature

pressure and WHSV LPG also showed significant influence on the performance of the catalyst. The optimum reaction conditions were 450℃

2. 0 MPa and WHSV LPG 0. 83 h-1. A high coking rate of the catalyst was observed when higher temperature

higher pressure and higher WHSV LPG were used.