Abstract
The acidity and coke deposits of HZSM-5 and NiHZSM-5 catalysts were studied in the aromatization using NH3-TPD, IR and TPD techniques. The results showed that both strong acid and B acid sites decreased quickly at the initial stage of reaction for the two catalysts. The coking and reaction rates also dropped quickly at this stage. Yet it was discovered, that adding Ni into HZSM-5 led to weakening B acid sites and strengthening L acid ones. At the same time, the results revealed that metallic Ni decreases the coking rates and slows down the activity decline rates.
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Guangzhong, Z., Ping, Z. A study of acidity and coke deposits on NiHZSM-5 catalyst in aromatization. React Kinet Catal Lett 66, 231–236 (1999). https://doi.org/10.1007/BF02475795
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DOI: https://doi.org/10.1007/BF02475795