Effect of zeolite morphology on charge separated states: ZSM-5-type nanocrystals, nanosheets and nanosponges

Abstract

In the present work, we investigate the electron transfer occurring in the porous void of three MFI-type zeolite (ZSM-5) nanomaterials (nanocrystals, nanosheets and nanosponges) after adsorption and photoexcitation of t-stilbene (t-St).

Ultrafast formation of exciplex species in dicyanoanthracene ZSM-5 revealed by transient emission and vibrational spectroscopy

“…While microsized zeolite crystals exhibit a rather small external surface area (10-50 m 2 / gm) in comparison to the internal surface are (ca 500 m 2 /gm), the emergence of zeolites synthesized in the form of nanosized crystallites and films [23,24] or of 2D-nanosheets [25] has significantly increased the surface-to-volume ratio and the transport efficiency of these materials. This opens novel possibilities for exploiting the high external surface of the zeolitic materials, also in synergy with the encapsulation of active guest compounds whose photochemical behavior can potentially be strongly modified as the dimension of the zeolite is approaching the unit-cell dimension [26,27]. Among other properties, the zeolites are effective in controlling the charge separation between electron donor and acceptor systems [8,28], in certain cases, the zeolite framework participates even directly to the process of charge stabilization [29][30][31][32].…”

Insights into the Effect of the Adsorption Preference of Additives on the Anisotropic Growth of ZSM‐5 Zeolite

“…The other 10‐MR sinusoidal channels, parallel to [010] surface along a ‐direction, are more tortuous, resulting in the higher diffusion resistance [5–6] . Such anisotropic structure of zeolite catalyst renders the vital role of zeolite morphology in a variety of catalytic reactions, for example, epoxidation, benzene alkylation, Beckman rearrangement, methanol to olefins and syngas to aromatics [9–11] . The morphology modulation thus becomes one of the significant issues in the synthesis of ZSM‐5 samples.…”

“…[5][6] Such anisotropic structure of zeolite catalyst renders the vital role of zeolite morphology in a variety of catalytic reactions, for example, epoxidation, benzene alkylation, Beckman rearrangement, methanol to olefins and syngas to aromatics. [9][10][11] The morphology modulation thus becomes one of the significant issues in the synthesis of ZSM-5 samples. Exploiting simple and economic methods to effectively customize anisotropic crystals with precise morphology is thus highly desired.…”