Inelastic neutron scattering of Na-zeolite A with in situ ammoniation: An examination of initial coordination

A.G. Seel, A. Sartbaeva, P.P. Edwards, A.J. Rammirez-Cuesta

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The detection and rationalization of the coordination of low concentrations of ammonia within Na-zeolite A is carried out by the application of inelastic neutron scattering (INS), using inverse geometry time of flight spectrometry to study the partial phonon density of states of in situ ammoniated Na-zeolite A. The experimental spectra are subsequently characterised by density functional calculations, incorporating pre-optimisation by geometric simulation. We find that at a concentration of four ammonia molecules per α-cage, the ammonia molecule coordinates with extra-framework Na* cations and gives rise to three structured regions in the INS spectrum. We show that these regions correspond to translational, librational and tilting motions of the ammonia molecule. These results are in agreement structurally with previous studies of ammonia within a zeolite, and thus show that INS is a valid technique for such investigations.
Original languageEnglish
Pages (from-to)9661-9666
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume12
Issue number33
DOIs
Publication statusPublished - 7 Sep 2010

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