Ultrafine copper clusters confined in amino-functionalized mesoporous silica nanospheres for renewable biomass upgrading

Lan, Fujun; Shu, Yu; Zhang, Huiling; Zhang, Dexiang; Guan, Qingxin; Wei, Li

doi:10.1016/j.fuel.2023.129425

Cited by 1 publication

(1 citation statement)

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“…However, downsizing of guest species increases their surface energy, leading to aggregation and, consequently, mesochannel plugging during postmodification. , To address this, grafting methods have been introduced to improve the dispersity and stability of guest species. These methods involve designed interfacial reactions between surface silicon hydroxyl groups and organosilane compounds, resulting in anchor points such as sulfonyl, carboxyl, thiol, and amine groups. ,− These anchor points, in addition to physisorption, effectively ensure the isolation of guest species effectively.…”

Section: Introductionmentioning

confidence: 99%

Acetate Ions Facilitated Immobilization of Highly Dispersed Transition Metal Oxide Nanoclusters in Mesoporous Silica

Wang,

Li,

Lian

et al. 2024

Inorg. Chem.

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The immobilization of tiny active species within inert mesoporous silica imparts a range of functions, enhancing their applicability. A significant obstacle is the spontaneous migration and aggregation of these species within the mesopores, which threaten their uniform distribution. To address this, we propose a postmodification method that involves grafting transition metal oxide nanoclusters into silica mesopores via interfacial condensation, catalyzed by acetate ions. Specifically, CuO nanoclusters, in the form of oligomeric, have a strong interaction with the silica framework. This interaction inhibits their growth and prevents mesopore blockage. Theoretical calculation results reveal that the acetate ion promotes proton transfer among various hydroxy species, lowering the free energy and thereby facilitating the formation of Cu−O−Si bonds. This technique has also been successfully applied to the encapsulation of four other types of transition metal oxide nanoclusters. Our encapsulation strategy effectively addresses the challenge of dispersing transition metal oxides in mesoporous silica, offering a straightforward and widely applicable method for enhancing the functionality of mesoporous materials.

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