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In situ synthesis of metal clusters encapsulated within small-pore zeolites via a dry gel conversion method

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Abstract

We report here a facile strategy for encapsulating Pt clusters into MFI crystals via a dry gel conversion (DGC) method, by introducing Pt-immobilized Schiff-SiO2 as the silicon resource. This protocol involves a solid phase transformation process for crystallization which occurs without significant deconstruction of the structure of the Pt-containing precursor. High-angle annular dark-field scanning transmission electron microscopy images indicate that most of the Pt clusters are less than 1 nm in size and located in defective channels or voids of MFI. Thanks to the encapsulation role, these Pt clusters are stable against sintering even after calcination at 500 °C and only grow up to ∼2.8 nm after calcination at 800 °C. The uniform pore structure of a zeolite endows the Pt@zeolite catalyst with shape-selectivity for hydrogenation and oxidation reactions over size differentiated analog substrates. This synthesis method is attainable for the embedment of stable metal clusters inside the small-pore MFI zeolite.

Graphical abstract: In situ synthesis of metal clusters encapsulated within small-pore zeolites via a dry gel conversion method

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Publication details

The article was received on 20 Jan 2018, accepted on 18 Mar 2018 and first published on 21 Mar 2018


Article type: Paper
DOI: 10.1039/C8NR00549D
Citation: Nanoscale, 2018, Advance Article
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    In situ synthesis of metal clusters encapsulated within small-pore zeolites via a dry gel conversion method

    X. Yang, Q. Liu, Y. Zhang, X. Su, Y. Huang and T. Zhang, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR00549D

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