Publication

Back to overview Show all

Original article (peer-reviewed)

Journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume (Issue) 36(19)
Page(s) 12141 - 12147
Title of proceedings INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
DOI http://dx.doi.org/10.1016/j.ijhydene.2011.06.128

Abstract

Solar syngas production from CO2 and H2O is considered in a two-step thermochemical cycle via Zn/ZnO redox reactions, encompassing: 1) the ZnO thermolysis to Zn and O2 using concentrated solar radiation as the source of process heat, and 2) Zn reacting with mixtures of H2O and CO2 yielding high-quality syngas (mainly H2 and CO) and ZnO; the ZnO is recycled to the first, solar step, resulting in net reaction βCO2 + (1 − β)H2O → βCO + (1 − β)H2. Syngas is further processed to liquid hydrocarbon fuels via Fischer–Tropsch or other catalytic processes. Second-law thermodynamic analysis is applied to determine the cycle efficiencies attainable with and without heat recuperation for varying molar fractions of CO2:H2O and solar reactor temperatures in the range 1900–2300 K. Considered is the energy penalty of using Ar dilution in the solar step below 2235 K for shifting the equilibrium to favor Zn production.
-