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Issue 25, 2013
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A facile route to cage-like mesoporous silica coated ZSM-5 combined with Pt immobilization

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Abstract

Uniform core–shell composites with cage-like mesoporous silica (CmesoSiO2) shells and zeolite HZSM-5 cores have been synthesized by a facile acid-catalyzed sol–gel coating process. The mesoporous silica shells are uniform and coated on the anisotropic HZSM-5 crystal faces, and the shell-thicknesses can be tuned from 25 to 70 nm. The core–shell composites possess a high surface area (∼862 m2 g−1) and pore volume (∼0.66 cm3 g−1), large pore sizes (3.2–8.2 nm) and unchanged zeolite micropore properties. The silica shells are composed of cage-like mesopores and entrances (ranging from 3.2 to 8.2 nm) as well as a plenty of micropores. Pt nanocatalysts with an average particle size of ∼3.2 nm have been successfully encapsulated into the micropores and partial mesopores of the cage-like silica shells. The catalytic oxidation of toluene shows that the Pt/HZ@CmesoSiO2 composite presents an equivalent activity for toluene combustion at the light-off temperature of ∼195 °C (T50%) relative to the mixture catalyst (198 °C of T50%), but more excellent catalytic durability without activity loss (193 °C of T50%) after a 100 h test.

Graphical abstract: A facile route to cage-like mesoporous silica coated ZSM-5 combined with Pt immobilization

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Publication details

The article was received on 09 Mar 2013, accepted on 17 Apr 2013 and first published on 20 May 2013


Article type: Paper
DOI: 10.1039/C3TA10992E
Citation: J. Mater. Chem. A, 2013,1, 7525-7532
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    A facile route to cage-like mesoporous silica coated ZSM-5 combined with Pt immobilization

    X. Qian, D. Xiong, A. M. Asiri, S. B. Khan, M. M. Rahman, H. Xu and D. Zhao, J. Mater. Chem. A, 2013, 1, 7525
    DOI: 10.1039/C3TA10992E

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