Location and Mobility of acidic protons in zeolite L by Neutron powder diffraction
Acidic zeolites are used in the chemical and petroleum industry because of their catalytic activity, reaction selectivity, and chemical and thermal stability. Neutron diffraction is best experimental method to probe Brønsted siting and it was used by our group to characterize acidic ferrierite, mordenite and heulandite(data collected at ILL, line D2B).The aim of this proposal is to determine the number and location of Brønsted sites in zeolite L, a large pore material whose acidity influences the photophysical behavior of encapsulated dyes and can affect the properties of photonic antenna systems based on dye–zeolite host–guest materials. We plan to collect two samples: the first exchanged with ND4 and then calcined at 550°C(D-LTL).Part of this will be then washed with D2O to obtain its acidic rehydrated form (RD-LTL).The data will be processed by the GSAS package. The protons location in D-LTL will provide essential information on the accessibility to molecules of Brønsted sites within the zeolite channels.The RD-LTL study will provide a complete understanding of both the hydrogen bonding network and the degree of confinement of zeolitic water in LTL
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Annalisa Martucci; CRUCIANI Giuseppe; Simone Dolabella; PASTI Luisa; Elisa Rodeghero and SUARD Emmanuelle. (2016). Location and Mobility of acidic protons in zeolite L by Neutron powder diffraction. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-22-744
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