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Citation: LIU Bai-Jun, ZENG Xian-Jun, WANG Hui, HUANG Yong, WANG Mei. Crystal Transformation among ZSM-5, ZSM-57 andMordenite[J]. Acta Physico-Chimica Sinica, ;2007, 23(04): 503-507. doi: 10.3866/PKU.WHXB20070410 shu

Crystal Transformation among ZSM-5, ZSM-57 andMordenite

1.
Key Laboratory of Catalysis of CNPC, China University of Petroleum, Beijing 102249, P. R. China

Received Date: 26 September 2006
Available Online: 14 March 2007

The crystal transformation among ZSM-5, ZSM-57, and mordenite was studied under different conditions, such as SiO2/Al2O3 molar ratio, alkalinity, n-butylamine template, crystallization time, and temperature. The results showed that higher alkalinity and longer crystallization time were of benefit to mordenite; lower alkalinity and higher induction temperature of crystallization were in favor of ZSM-57 with low n(SiO2)/n(Al2O3) ratio; alkalinity was required to be adjusted accurately to synthesize ZSM-5 with low n(SiO2)/n(Al2O3) ratio, shortening of crystallization time, decrease in induction temperature of crystallization, and the addition of seed crystal were all in favor of ZSM-5 with low n(SiO2)/n(Al2O3) ratio. A slight change in the above conditions would result in the transformation among the three crystals, and two or more crystal phases could be observed in the products.
- Zeolite ZSM-5; Zeolite ZSM-57; Mordenite; Crystal transformation
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