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Adsorption Characteristics of Nitrogen Monoxide on Y-type and ZSM-5 Zeolites Exchanged with Alkali/Alkaline-earth Metal Cation  

Kim, Cheol Hyun (Department of Gas Industry, Andong Information Technology)
Lee, Chang Seop (Department of Chemistry, Keimyung University)
Publication Information
Applied Chemistry for Engineering / v.16, no.6, 2005 , pp. 857-864 More about this Journal
Abstract
Dealuminated and alkali/alkaline-earth metal exchanged Y-type and ZSM-5 zeolites were prepared as catalytic materials. Comparing with the composition of starting material, the magnitude of Si/Al ratio was increased after dealumination and cation exchange process. The ratio of Si/Al on surface was appeared to be larger than that in bulk. The destruction of basic frame in catalysts observed was understood to be due to a detachment of aluminum, which results in reducing framework while increasing non-framework. This phenomenon becomes more serious with increasing time of steam treatment and even more significant for the cation exchanged catalysts. The desorption peaks of the NO-TPD profiles taken after dealumination and cation exchanged Y-type and ZSM-5 zeolites shifted to the low temperature region. It was also found that the longer the steam treatment time, the degree of shift toward low temperature region was increased. The catalytic activities are dependent on the nature of cation exchanged, the ratio of Si/Al and the ratio of framework/non-framework by a change in basic frame.
Keywords
Y-zeolite; ZSM-5; dealumination; cation exchange; NO-TPD;
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