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Issue 15, 2017
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A controlled alkaline treatment of Al-SBA-15: a facile route to adjust the chemical composition and synthesize an ordered mesoporous carbon material, CMK-3, possessing strong pressure resistant capability

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Abstract

The effect of an alkaline treatment on the mesoporous material Al-SBA-15 was investigated using powder X-ray diffraction (XRD), inductively coupled plasma (ICP) analysis, mid-infrared spectroscopy (IR), N2 sorption isotherm measurements, transmission electron microscopy (TEM), scanning electron microscopy (SEM), solid state 27Al MAS NMR analysis, and structural replicating technology. It was observed that elemental Si could be readily extracted from wall structures, and the Al-rich surface that was consequently exposed protected the uniform hexagonal arrays. The extracted substances rapidly accumulate inside the Al-SBA-15 mesopores and continuously dissolve and migrate into the alkaline solution upon a prolonged treatment time. Therefore, alkaline-treated Al-SBA-15 exhibits a larger pore size and a thinner wall than that before treatment. Due to its Al-rich surface and highly-open mesostructure, alkaline-treated Al-SBA-15 exhibits excellent catalytic performance in a low density polyethylene (LDPE) catalytic degradation reaction. The temperature corresponding to the maximum degradation rate was measured to be ∼10 K lower than that in raw Al-SBA-15. More importantly, the secondary-scale mesopores inside the Al-SBA-15 walls were remarkably expanded, allowing efficient penetration of the carbon precursor. Its structural replica, CMK-3, has a highly ordered mesostructure, which is attributed to the formation of enhanced carbon sticks that connect the primary carbon rods. For the same reason, CMK-3 templated from alkaline-treated Al-SBA-15 exhibits a strong pressure resistant capability. The reduction in the surface area and pore volume after high-pressure treatment were calculated to be as low as 4.5% and 3.0%, respectively.

Graphical abstract: A controlled alkaline treatment of Al-SBA-15: a facile route to adjust the chemical composition and synthesize an ordered mesoporous carbon material, CMK-3, possessing strong pressure resistant capability

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Publication details

The article was received on 31 May 2017, accepted on 21 Jun 2017 and first published on 21 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ01914A
Citation: New J. Chem., 2017,41, 7634-7642
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    A controlled alkaline treatment of Al-SBA-15: a facile route to adjust the chemical composition and synthesize an ordered mesoporous carbon material, CMK-3, possessing strong pressure resistant capability

    S. Lin, R. Liu, N. Li, P. Guo and L. Shi, New J. Chem., 2017, 41, 7634
    DOI: 10.1039/C7NJ01914A

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