Title: Bifunctional mesoporous Cu-Al-MCM-41 materials for the simultaneous catalytic abatement of NO(x) and VOCs
Authors: Karthik, Mani
Lin, Liang-Yi
Bai, Hsunling
Institute of Environmental Engineering
Issue Date: 1-Jan-2009
Abstract: This study explored the possibility of using waste organic solvent as the source of volatile organic compound (VOC) and it served as a reducing agent of selective catalytic reduction (SCR) deNO(x) process, in which the VOC itself can be catalytically oxidized on the mesoporous Cu and/or Al substituted MCM-41 catalysts. The synthesized Cu-Al-MCM-41 catalysts were extensively characterized by powder low-angle X-ray diffraction (XRD), N(2) adsorption-desorption measurements, transmission electron microscopy (TEM), UV-Visible diffuse reflectance spectroscopy (UV-Vis DRS), (27)Al magic angle spinning-nuclear magnetic resonance spectroscopy (MAS-NMR), electron paramagnetic resonance spectroscopy (EPR) and inductively coupled plasma-mass spectrometer (ICP-MS) analysis. The XRD, TEM and N2 adsorption-desorption studies clearly demonstrated the presence of a well ordered long range hexagonal array with uniform mesostructures. The Cu-Al-MCM-41 materials showed a better long-term-stability than that of copper ion-exchanged H-ZSM-5 (Cu-ZSM-5) zeolite. The Cu-Al-MCM-41 material was found to be an efficient catalyst than that of Cu-MCM-41 without aluminum for the simultaneous catalytic abatement of NO(x) and VOCs, which was attributed to the presence of well dispersed and isolated Cu(2+) ions on the Cu-Al-MCM-41 catalyst as observed by UV-Vis DRS and EPR spectroscopic studies. And the presence of aluminum (Al(3+) ions) within the framework of Cu-Al-MCM-41 stabilized the isolated Cu(2+) ions thus it led to higher and stabilized activity in terms of NO(x) reduction. (C) 2008 Elsevier Inc. All rights reserved.
URI: http://dx.doi.org/10.1016/j.micromeso.2008.06.016
ISSN: 1387-1811
DOI: 10.1016/j.micromeso.2008.06.016
Volume: 117
Issue: 1-2
Begin Page: 153
End Page: 160
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