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Title: Photocatalytic CO{sub 2} reduction by CH{sub 4} over montmorillonite modified TiO{sub 2} nanocomposites in a continuous monolith photoreactor

Highlights: • TiO{sub 2}/MMT supported monolith photo-reactor was tested for CO{sub 2} reduction with CH{sub 4}. • MMT inhibited crystal growth and enhanced TiO{sub 2} photo-activity in monolith reactor. • CO{sub 2} was reduced by CH{sub 4} to CO, CH{sub 3}OH, C{sub 2}H{sub 6}, C{sub 3}H{sub 6} and C{sub 3}H{sub 8} in a monolith reactor. • CO yield over TiO{sub 2}/MMT was 237.5 μmol g-catal.{sup −1} h{sup −1}, a 2.52 fold than TiO{sub 2}. • Stability test revealed TiO{sub 2}/MMT partially lost photo-activity in reused cyclic runs. - Abstract: In this study, the performance of montmorillonite (MMT) modified TiO{sub 2} nanocomposites for photocatalytic CO{sub 2} reduction with CH{sub 4} in a continuous monolith photoreactor has been investigated. The MMT modified TiO{sub 2} nanocomposites were dip-coated over monolith channels and were characterized by XRD, SEM, TEM, XPS, N{sub 2}-adsorption–desorption and UV–vis spectroscopy. The MMT produced anatase phase of TiO{sub 2} and reduced TiO{sub 2} crystallite size from 19 nm to 13 nm. CO was the major reduction product with a yield rate of 237.5 μmol g-catal.{sup −1} h{sup −1} over 10 wt.% MMT-loaded TiO{sub 2} at 100 °C, and CO{sub 2}/CH{sub 4} feed ratio 1.0. The photoactivity of MMT-loaded TiO{sub 2}more » monolithic catalyst was 2.52 times higher than bare TiO{sub 2}. Likewise, low concentrations of C{sub 2}H{sub 6}, CH{sub 3}OH, C{sub 3}H{sub 6} and C{sub 3}H{sub 8} were detected in the products mixture. These results inferred MMT modified TiO{sub 2} and monolith photoreactor were beneficial for enhancing photocatalysis process with appreciable productivity. The stability test revealed photoactivity of MMT-loaded TiO{sub 2} nanocomposites partially diminished in recycle runs.« less
Authors:
 [1] ;  [2] ;  [1] ;  [1]
  1. Chemical Reaction Engineering Group (CREG)/Low Carbon Energy Group, Faculty of Chemical Engineering, Universiti Teknologi Malaysia, 81310 UTM, Skudai, Johor Baharu, Johor (Malaysia)
  2. (Pakistan)
Publication Date:
OSTI Identifier:
22420822
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 63; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADSORPTION; CARBON DIOXIDE; CARBON MONOXIDE; CATALYSTS; CRYSTAL GROWTH; DESORPTION; ETHANE; METHANE; MONTMORILLONITE; NANOCOMPOSITES; NANOSTRUCTURES; PHOTOCATALYSIS; PROPANE; PROPYLENE; SCANNING ELECTRON MICROSCOPY; SEMICONDUCTOR MATERIALS; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY