Journal
MATERIALS RESEARCH BULLETIN
Volume 63, Issue -, Pages 13-23Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2014.11.042
Keywords
Layered compounds; Semiconductors; Photocatalysis; Nanostructure; Catalytic properties
Categories
Funding
- Ministry of Higher Education (MOHE), Malaysia
- Universiti Teknologi Malaysia under LRGS (Long-term Research Grant Scheme) [Vot 4L800]
- Universiti Teknologi Malaysia under RUG (Research University Grant) [Vot 02G14]
- Universiti Teknologi Malaysia under FRGS (Fundamental Research Grant Scheme) [Vot 4F404]
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In this study, the performance of montmorillonite (MMT) modified TiO2 nanocomposites for photocatalytic CO2 reduction with CH4 in a continuous monolith photoreactor has been investigated. The MMT modified TiO2 nanocomposites were dip-coated over monolith channels and were characterized by XRD, SEM, TEM, XPS, N-2-adsorption-desorption and UV-vis spectroscopy. The MMT produced anatase phase of TiO2 and reduced TiO2 crystallite size from 19 nm to 13 nm. CO was the major reduction product with a yield rate of 237.5 mu mol g-catal.(-1) h(-1) over 10 wt.% MMT-loaded TiO2 at 100 degrees C, and CO2/CH4 feed ratio 1.0. The photoactivity of MMT-loaded TiO2 monolithic catalyst was 2.52 times higher than bare TiO2. Likewise, low concentrations of C2H6, CH3OH, C3H6 and C3H8 were detected in the products mixture. These results inferred MMT modified TiO2 and monolith photoreactor were beneficial for enhancing photocatalysis process with appreciable productivity. The stability test revealed photoactivity of MMT-loaded TiO2 nanocomposites partially diminished in recycle runs. (C) 2014 Elsevier Ltd. All rights reserved.
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