Study of the ammonia–zeolite interaction in modified ZSM-5 by temperature-programmed desorption of ammonia
- 1 January 1989
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 85 (9) , 2941-2944
- https://doi.org/10.1039/f19898502941
Abstract
T.p.d. of ammonia is a useful method for investigating the surface behaviour of zeolites. By means of various experimental manipulations it is possible to separate the specific ammonia zeolite interactions in order to give a sensible assignment of the corresponding adsorption sites. The high-temperature peak near 500 °C (h-peak) characterizes acidic Brønsted sites, whereas in the low-temperature desorption range two desorption peaks may appear at ca. 275 and 325 °C (l-peak and li-peak, respectively), which are though to be due to the interaction of ammonia especially with framework aluminium (l-peak) and sodium cations in the structure (li-peak).Keywords
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