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Issue 22, 2015
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Nanoparticle prepared mechanically stable hierarchically porous silica granulates and their application as oxygen carrier supports for chemical looping combustion

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Abstract

Chemical looping combustion (CLC) represents a promising approach to capture CO2 emissions in the fossil fuel powered energy generations. Oxygen carriers, composed of active metal oxides, play important roles in the CLC process by transferring oxygen between oxidation and reduction reactors. To avoid the agglomeration of metallic phase during the reduction process and ensure a long-term activity, a porous support granulate is highly required. In this work, we proposed a bottom-up strategy to fabricate mechanical stable hierarchical porous granulates from silica nanoparticles, via the integration of soft pore former Pluronic F127 and employment of cold isostatic pressing technique. According to this strategy, the developed silica granulates possess characteristics such as mesopore (ca. 33 nm) and macropore (ca. 175 nm) combined hierarchical porous structure, high pore volume (955 mm3 gāˆ’1) and surface area (114 m2 gāˆ’1), as well as enhanced crushing force 1.94 N. Via the dry impregnation method, fully oxidized CuO was able to be loaded on the surface of porous granulates and a loading amount of 30 wt% was obtained after repeating the impregnation process only twice. Further simulated chemical looping tests revealed that, with the similar loading amount, CuO supported on developed silica granulate shows a higher oxygen transport capacity comparing with reference work.

Graphical abstract: Nanoparticle prepared mechanically stable hierarchically porous silica granulates and their application as oxygen carrier supports for chemical looping combustion

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Publication details

The article was received on 12 Mar 2015, accepted on 26 Apr 2015 and first published on 11 May 2015


Article type: Paper
DOI: 10.1039/C5TA01842K
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J. Mater. Chem. A, 2015,3, 11863-11873

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    Nanoparticle prepared mechanically stable hierarchically porous silica granulates and their application as oxygen carrier supports for chemical looping combustion

    Y. Liu, P. Kirchesch, T. Graule, A. Liersch and F. Clemens, J. Mater. Chem. A, 2015, 3, 11863
    DOI: 10.1039/C5TA01842K

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