Hydrogen production via sulfur-based thermochemical cycles: Part 2: Performance evaluation of Fe2O3-based catalysts for the sulfuric acid decomposition step

Giaconia, Alberto; Sau, Salvatore; Felici, C.; Tarquini, P.; Karagiannakis, George; Pagkoura, Chrysoula; Agrafiotis, Christos; Konstandopoulos, Athanasios G.; Thomey, Dennis; Oliveira, Lamark de; Roeb, Martin; Sattler, Christian

doi:10.1016/j.ijhydene.2011.02.137

Cited by 73 publications

(20 citation statements)

References 20 publications

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“…To further improve the activities of various catalysts, the thermodynamic data are thus needed to know the maximum SO 3 conversion ratio. In previous literatures, various evaluations of the SO 3 conversion thermodynamic can be found [3,8,15,[21][22][23][24][25][26][27]. The systematic studies of SO 3 decomposition show the equilibrium conversion ratio is influenced by pressure and temperature dramatically; thus, the partial pressure of gaseous SO 3 in the reactor needs to be carefully considered when a thermodynamic curve is obtained [3,4,24,25].…”

Section: Introductionmentioning

confidence: 99%

Study on CuO-CeO₂/SiC catalysts in the sulfur-iodine cycle for hydrogen production

Zhang

Zhou

et al. 2016

Int. J. Energy Res.

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Summary The structure and activity of ceria–copper oxides supported on nanometer silicon carbide (nano‐SiC) particles for sulfuric acid decomposition were studied. The promoting activities and stabilities of CuO–CeO2 complex oxides loaded on nano‐SiC grains were prominently higher than those of CuO–CeO2 without carriers, especially at <800 °C. The results of X‐ray diffraction (XRD), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HRTEM) showed that copper‐cerium composite oxides grains were well dispersed and fixed on the surface of SiC particle, and the average sizes of CuO–CeO2 complex oxides carried by SiC particles were considerably smaller than those of CuO–CeO2 without carriers. Based on the analysis of HRTEM images, X‐ray photoelectron spectroscopy (XPS) spectra, and infrared radiation (IR) pattern, the majority of SiC surfaces were converted to SiO2 layers, in which CeO2 grains immobilized by coordination bonding Ce–O–Si bridges. From the temperature programmed reduction (TPR) patterns, compared with those of CuO–CeO2 without carrier, the reduction temperature of CuO to Cu2O in CuO–CeO2/SiC catalysts was lowered, especially at (Ce + Cu)/SiC atomic ratio of 5 mol.%. The catalysts also showed relatively high activities at 727 °C for 20 h of continuous operation. A mechanism of SO3 decomposition on CuO–CeO2/SiC was proposed according to the characterization results. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Study on CuO-CeO₂/SiC catalysts in the sulfur-iodine cycle for hydrogen production

Zhang

Zhou

et al. 2016

Int. J. Energy Res.

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“…The gases are superheated to above 1000 °C in a closed volumetric receiver, which is the subject of the current work. SO 3 will then be decomposed in an adiabatic reactor containing iron(III)-oxide (Fe 2 O 3 ) coated pellets, with expected performance similar as described in [11].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Model of a Solar Receiver for Superheating of Sulfur Trioxide and Steam at Pilot Plant Scale

Niehoff

Thomey

Gonzales

et al. 2016

Volume 1: Biofuels, Hydrogen, Syngas, and Alternate Fuels; CHP and Hybrid Power and Energy Systems; Concentrating Solar Power;

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Within the European research project SOL2HY2, key components for a solar hybrid sulfur cycle are being developed and demonstrated at pilot scale in a real environment. Regarding the thermal portion, a plant for solar sulfuric acid decomposition is set up and initially operated at the research platform of the DLR Solar Tower in Jüulich, Germany. One major component is the directly irradiated volumetric receiver, superheating steam and SO3 coming from a tube-type evaporator to above 1000 °C. At the design flow rate of sulfuric acid (50%-wt.) of 1 l/min, a nominal solar power of 57 kW is required at the receiver. With a flat ceramic absorber made from SiC and a flat quartz glass window, the design is based on lab scale reactors successfully demonstrated at the solar furnace of the German Aerospace Centre (DLR) in Cologne, Germany. A flexible lumped thermodynamic tool representing the receiver, compiled to assess different configurations, is presented in detail. An additional raytracing model has been established to provide the irradiation boundaries and support the design of a conical secondary concentrator with an aperture diameter of 0.6 m. A comparison with first experimental data (up to 65% nominal power), obtained during initial operation, indicates the models to be viable tools for design and operational forecast of such systems. With a provisional method to account for the efficiency of the secondary concentrator, measured fluid outlet temperatures (up to 1000 °C) are predicted with deviations of ±60 °C. Respective absorber front temperatures (up to 1200 °C) are under-predicted by 100–200 °C, with lower deviations at higher mass flows. The measured window temperature (up to 700 °C) mainly depends on the absorber front temperature level, which is well predicted by the model.

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“…Several sulfur-based cycles using the decomposition of sulfuric acid have been extensively studied as an oxygen-generating reaction for this purpose [5]. A most promising example is so-called Iodine-Sulfur (IS) cycle consisting of three reactions in the following [5][6][7] We have recently reported that copper vanadate is a promising candidate catalyst for SO 3 decomposition below 650 °C [8,9] where most conventional oxide catalysts are less active and less stable [10][11][12][13][14][15][16][17][18][19]. The catalytic activity is enhanced by supporting the compound onto 3-D mesoporous SiO 2 followed by thermal aging above the melting point of vanadate (>780 °C) [20], which causes a molten liquid phase enabling penetration into SiO 2 mesopores.…”

Section: Introductionmentioning

confidence: 99%

Structure and SO3 decomposition activity of nCuO–V2O5/SiO2 (n= 0, 1, 2, 3 and 5) catalysts for solar thermochemical water splitting cycles

2015

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SiO 2-supported nCuO-V 2 O 5 catalysts with different ratios (n=0, 1, 2, 3 and 5) were prepared to study their catalytic activity for SO 3 decomposition, which is a key reaction necessary for solar thermochemical H 2 production. Although four binary compounds, CuV 2 O 6 , Cu 2 V 2 O 7 , Cu 3 V 2 O 8 and Cu 5 V 2 O 10 , were formed on three-dimensional (3-D) mesoporous SiO 2 depending on the ratio (n), the thermal ageing caused their incongruent melting and precipitation of Cu 2 V 2 O 7. The highly corrosive molten vanadate phase resulted in mesopore-to-macropore conversion of SiO 2 , which was accompanied by significant decrease of BET surface area and pore volume. Nevertheless, the structural conversion yielded copper vanadate with a high surface coverage of SiO 2 cavity walls enabling efficient catalytic SO 3 decomposition at moderated reaction temperatures (~600 °C). Among nCuO-V 2 O 5 /SiO 2 catalysts, the highest catalytic activity was achieved for n=1, which corresponds to the phase with the lowest melting point (630 °C) of the present system.

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Hydrogen production via sulfur-based thermochemical cycles: Part 2: Performance evaluation of Fe2O3-based catalysts for the sulfuric acid decomposition step

Cited by 73 publications

References 20 publications

Study on CuO-CeO₂/SiC catalysts in the sulfur-iodine cycle for hydrogen production

Study on CuO-CeO₂/SiC catalysts in the sulfur-iodine cycle for hydrogen production

Thermodynamic Model of a Solar Receiver for Superheating of Sulfur Trioxide and Steam at Pilot Plant Scale

Structure and SO3 decomposition activity of nCuO–V2O5/SiO2 (n= 0, 1, 2, 3 and 5) catalysts for solar thermochemical water splitting cycles

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Hydrogen production via sulfur-based thermochemical cycles: Part 2: Performance evaluation of Fe2O3-based catalysts for the sulfuric acid decomposition step

Cited by 73 publications

References 20 publications

Study on CuO-CeO2/SiC catalysts in the sulfur-iodine cycle for hydrogen production

Study on CuO-CeO2/SiC catalysts in the sulfur-iodine cycle for hydrogen production

Thermodynamic Model of a Solar Receiver for Superheating of Sulfur Trioxide and Steam at Pilot Plant Scale

Structure and SO3 decomposition activity of nCuO–V2O5/SiO2 (n= 0, 1, 2, 3 and 5) catalysts for solar thermochemical water splitting cycles

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Study on CuO-CeO₂/SiC catalysts in the sulfur-iodine cycle for hydrogen production

Study on CuO-CeO₂/SiC catalysts in the sulfur-iodine cycle for hydrogen production