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Determining the location and nearest neighbours of aluminium in zeolites with atom probe tomography. | LitMetric

Determining the location and nearest neighbours of aluminium in zeolites with atom probe tomography.

Nat Commun

Faculty of Science, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands.

Published: July 2015

AI Article Synopsis

Article Abstract

Zeolite catalysis is determined by a combination of pore architecture and Brønsted acidity. As Brønsted acid sites are formed by the substitution of AlO4 for SiO4 tetrahedra, it is of utmost importance to have information on the number as well as the location and neighbouring sites of framework aluminium. Unfortunately, such detailed information has not yet been obtained, mainly due to the lack of suitable characterization methods. Here we report, using the powerful atomic-scale analysis technique known as atom probe tomography, the quantitative spatial distribution of individual aluminium atoms, including their three-dimensional extent of segregation. Using a nearest-neighbour statistical analysis, we precisely determine the short-range distribution of aluminium over the different T-sites and determine the most probable Al-Al neighbouring distance within parent and steamed ZSM-5 crystals, as well as assess the long-range redistribution of aluminium upon zeolite steaming.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4506508PMC
http://dx.doi.org/10.1038/ncomms8589DOI Listing

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