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Photocatalytic production of hydrogen from methanol and saccharides using carbon nanotube-TiO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
44946 46386 2015 9 PDF Available
Title
Photocatalytic production of hydrogen from methanol and saccharides using carbon nanotube-TiO2 catalysts
Abstract

•CNT-TiO2 composites were produced by hydration–dehydration and by one-pot oxidation.•One-pot oxidation synthesis leads to a better dispersion of TiO2 in composites.•TiO2 and CNT-TiO2 were loaded with Pt, Ir, Au and Pd by incipient wetness.•Cocatalyst nature and reduction temperature influence H2 production from methanol.•H2 yield from saccharides depends on structure, H:C ratio and availability of α-H.

Carbon nanotube-titanium dioxide composite materials were produced by two routes: hydration–dehydration and one-pot oxidation. Au, Pt, Ir and Pd were loaded on TiO2-based materials by an incipient wetness method. The resulting materials were calcined and afterwards reduced at two distinct temperatures, 473 and 673 K. Characterization was carried out by temperature programmed desorption, infrared and UV–Vis spectroscopy, N2 adsorption, SEM and TEM. Compared with reference TiO2, composite catalysts presented increased activity for photocatalytic production of H2 from methanol solutions. The highest activity was obtained for the Pt-loaded composite produced by the one-pot synthesis method, with 485 μmol of H2 being generated after two hours of irradiation, contrasting with 205 μmol of H2 obtained using Pt/TiO2. This synergic effect was discussed in terms of the action of carbon nanotubes as dispersing media for TiO2 particles as well as their action as photosensitizers. The relative efficiency of the catalysts was related to the work function of each metal and the sizes of the metal nanoparticles. H2 generation from photocatalytic reforming of saccharides, namely arabinose, glucose, fructose and cellobiose was performed using TiO2 and CNT-TiO2 based catalysts. The relative efficiency of H2 production from these biomass-derived compounds has been discussed based on their structural arrangement, H:C ratio and availability of α-hydrogens.

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Keywords
Photocatalysis; Hydrogen; Carbon nanotubes; Titanium dioxide; Saccharides
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Photocatalytic production of hydrogen from methanol and saccharides using carbon nanotube-TiO2 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 178, November 2015, Pages 82–90
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us