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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Perea DE,Arslan I,Liu J,Ristanović Z,Kovarik L,Arey BW,Lercher JA,Bare SR,Weckhuysen BMdoi
10.1038/ncomms8589subject
Has Abstractpub_date
2015-07-02 00:00:00pages
7589issn
2041-1723pii
ncomms8589journal_volume
6pub_type
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