Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7062343 | Thermochimica Acta | 2015 | 12 Pages |
Abstract
The thermochemical two-step water-splitting cycle using transition element-doped cerium oxide (M-CeO2âδ; M = Fe, Co, Ni, Mn) powders was studied for hydrogen production from water. The oxygen/hydrogen productivity and repeatability of M-CeO2âδ materials with M doping contents in the 5-15 mol% range were examined using a thermal reduction (TR) temperature of 1500 °C and water decomposition (WD) temperatures in the 800-1150 °C range. The temperature, steam partial pressure, and steam flow rate in the WD step had an impact on the hydrogen productivity and production rate. 5 mol% Fe- and Co-doped CeO2âδ enhances hydrogen productivity by up to 25% on average compared to undoped CeO2, and shows stable repeatability of stoichiometric oxygen and hydrogen production for the cyclic thermochemical two-step water-splitting reaction. In addition, 5 mol% Mn-doped CeO2âδ, 10 and 15 mol% Fe- and Mn-doped CeO2âδ show near stoichiometric reactivities.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Nobuyuki Gokon, Toshinori Suda, Tatsuya Kodama,