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- W2784593669 abstract "Positron annihilation lifetime spectroscopy (PALS) is a tool used to study pore networks in zeolites, as the diffusion of metastable ortho-positronium (o-Ps, an electron–positron bound pair) provides insights into connectivity that cannot be obtained by other techniques. The accurate assessment of porosity requires knowledge of the interaction of o-Ps with acid centers commonly present in these materials. Although previous studies have highlighted a potential effect, the specific impact of the nature and concentration of the acid sites remains unclear. By preparing a series of well-crystallized aluminum- and tin-containing MFI-type zeolites and with the study of commercial samples, we map the effects of Bronsted and Lewis acidity on the PALS response. The results reveal that both types of acid sites decrease the amount of o-Ps detected but through different mechanisms. Bronsted acid sites strongly affect the amount of o-Ps being annihilated in the micropore network but only nominally influence the amount ..." @default.
- W2784593669 created "2018-02-02" @default.
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- W2784593669 date "2018-02-02" @default.
- W2784593669 modified "2023-10-16" @default.
- W2784593669 title "Acidity Effects in Positron Annihilation Lifetime Spectroscopy of Zeolites" @default.
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- W2784593669 doi "https://doi.org/10.1021/acs.jpcc.7b11336" @default.
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