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RESEARCH PAPERS

Solar Production of Hydrogen Using “Self-Assembled” Polyoxometalate Photocatalysts

[+] Author and Article Information
N. Muradov1

Florida Solar Energy Center,  University of Central Florida, 1679 Clearlake Road, Cocoa, FL 32922-5703muradov@fsec.ucf.edu

A. T-Raissi

Florida Solar Energy Center,  University of Central Florida, 1679 Clearlake Road, Cocoa, FL 32922-5703

1

Corresponding author.

J. Sol. Energy Eng 128(3), 326-330 (Mar 08, 2006) (5 pages) doi:10.1115/1.2212442 History: Received July 08, 2005; Revised March 08, 2006

The near-term and cost-effective production of solar hydrogen from inexpensive and readily available hydrogen containing compounds (HCCs) can boost the prospects of future hydrogen economy. In this paper, we assess the prospects of the solar-assisted conversion of HCCs into hydrogen using polyoxometalate (POM) based photocatalysts, such as isopolytungstates (IPT) and silicotungstic acid (STA). Upon exposure to solar photons, IPT aqueous solutions containing various HCCs (e.g., alcohols, alkanes, organic acids, sugars, etc.) produce hydrogen gas and corresponding oxygenated compounds. The presence of small amounts of colloidal platinum increases the rate of hydrogen evolution by one order of magnitude. A solar photocatalytic flat-bed reactor, approximately 1.2m×1.2m in size, was fabricated and tested for the production of hydrogen from water-alcohol solutions containing IPT and STA and small amounts of colloidal Pt. The solar photoreactor tests demonstrated steady-state production of hydrogen gas for several days. IPT immobilized on granules of anion exchange resins with quaternary ammonium active groups show good photocatalytic activity for hydrogen production from water-alcohol solutions exposed to near-UV or solar radiation.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Self-assembly of hexa- and deca-tungstate polyanions ([W6O19]2− and [W10O32]4−, respectively) from tungstate (WO4)2− ions in acidic solution

Grahic Jump Location
Figure 2

Absorption spectrum of IPT anion in water-ethanol solution at pH=2 (pathlength: 1cm)

Grahic Jump Location
Figure 3

Absorption spectra of photoilluminated IPT aqueous solutions containing propane. Exposure time (min): a—0, b—2, c—5, d—16, e—30.

Grahic Jump Location
Figure 4

Solar photoreactor for hydrogen production from water-alcohol solutions containing POM and Ptc; 1—trough with reflective surface, 2—fused silica reactor tube, 3—gas collection chamber, 4—distribution manifold, 5—pump, 6—ice trap.

Grahic Jump Location
Figure 5

Solar hydrogen production from isopropanol-STA solution

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