Photocatalytic CO2 reduction by CH4 over montmorillonite modified TiO2 nanocomposites in a continuous monolith photoreactor

Muhammad Tahir; Beenish Tahir; Noraishah Saidina Amin

doi:10.1016/j.materresbull.2014.11.042

Photocatalytic CO₂ reduction by CH₄ over montmorillonite modified TiO₂ nanocomposites in a continuous monolith photoreactor

Muhammad Tahir, Beenish Tahir, Noraishah Saidina Amin

Research output: Contribution to journal › Article › peer-review

74 Citations (Scopus)

Abstract

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, N₂-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 μmol g-catal.^-1 h^-1 over 10 wt.% MMT-loaded TiO₂ at 100 °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.

Original language	English
Pages (from-to)	13-23
Number of pages	11
Journal	Materials Research Bulletin
Volume	63
DOIs	https://doi.org/10.1016/j.materresbull.2014.11.042
Publication status	Published - Mar 2015
Externally published	Yes

Keywords

Catalytic properties
Layered compounds
Nanostructure
Photocatalysis
Semiconductors

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.materresbull.2014.11.042

Cite this

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title = "Photocatalytic CO2 reduction by CH4 over montmorillonite modified TiO2 nanocomposites in a continuous monolith photoreactor",

abstract = "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, N2-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 μmol g-catal.-1 h-1 over 10 wt.% MMT-loaded TiO2 at 100 °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.",

keywords = "Catalytic properties, Layered compounds, Nanostructure, Photocatalysis, Semiconductors",

author = "Muhammad Tahir and Beenish Tahir and Amin, {Noraishah Saidina}",

year = "2015",

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AU - Tahir, Beenish

AU - Amin, Noraishah Saidina

PY - 2015/3

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N2 - 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, N2-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 μmol g-catal.-1 h-1 over 10 wt.% MMT-loaded TiO2 at 100 °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.

AB - 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, N2-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 μmol g-catal.-1 h-1 over 10 wt.% MMT-loaded TiO2 at 100 °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.

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KW - Semiconductors

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