Catalytic activity of supported metal particles for sulfuric acid decomposition reaction

Rashkeev, Sergey N.; Ginosar, Daniel M.; Petkovic, Lucı́a M.; Farrell, H. H.

doi:10.1016/j.cattod.2008.03.029

Cited by 49 publications

(42 citation statements)

References 22 publications

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“…Rashkeev et al discussed the SO 3 decomposition mechanism over Pt supported on rutile TiO 2 by using a combined experimental and theoretical approach that uses density-functional-theory (DFT)-based first-principle calculations. 13 They found that the catalytic activity of various precious metals supported on rutile TiO 2 at 850 °C decreased in the following order: Pt > Pd > Rh > Ir > Ru. According to their calculation model, the activity and deactivation of the catalysts can be determined by (i) the rate of the detachment of O atoms from the SO 3 species (SO 3s → SO 2s + O s ; the subscript s means adsorbed species) and (ii) the removal rate of the decomposition products (O s , S s , and SO x s ) from the surface of the metal nanoparticles.…”

Section: Discussionmentioning

confidence: 99%

Catalytic SO₃ Decomposition Activity and Stability of Pt Supported on Anatase TiO₂ for Solar Thermochemical Water-Splitting Cycles

et al. 2017

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Pt-loaded anatase TiO 2 (Pt/TiO 2 -A) was found to be a highly active and stable catalyst for SO 3 decomposition at moderate temperatures (∼600 °C), which will prove to be the key for solar thermochemical water-splitting processes used to produce H 2 . The catalytic activity of Pt/TiO 2 -A was found to be markedly superior to that of a Pt catalyst supported on rutile TiO 2 (Pt/TiO 2 -R), which has been extensively studied at a higher reaction temperature range (≥800 °C); this superior activity was found despite the two being tested with similar surface areas and metal dispersions after the catalytic reactions. The higher activity of Pt on anatase is in accordance with the abundance of metallic Pt (Pt 0 ) found for this catalyst, which favors the dissociative adsorption of SO 3 and the fast removal of the products (SO 2 and O 2 ) from the surface. Conversely, Pt was easily oxidized to the much less active PtO 2 (Pt 4+ ), with the strong interactions between the oxide and rutile TiO 2 forming a fully coherent interface that limited the active sites. A long-term stability test of Pt/TiO 2 -A conducted for 1000 h at 600 °C demonstrated that there was no indication of noticeable deactivation (activity loss ≤ 4%) over the time period; this was because the phase transformation from anatase to rutile was completely prevented. The small amount of deactivation that occurred was due to the sintering of Pt and TiO 2 and the loss of Pt under the harsh reaction atmosphere.

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Section: Discussionmentioning

confidence: 99%

Catalytic SO₃ Decomposition Activity and Stability of Pt Supported on Anatase TiO₂ for Solar Thermochemical Water-Splitting Cycles

et al. 2017

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“…The catalytic activity of PGM for SO 3 decomposition decreases in the following order: Pt > Pd > Rh > Ir > Ru. 32) Supported Pt catalysts are mostly studied for lowtemperature processes (³600°C). The SO 3 decomposition reaction steps using Pt can be described as follows:…”

Section: Pgm Catalystsmentioning

confidence: 99%

“…The rate of reaction ( 6) is always higher than those of reactions ( 7) and (8). 32) Pt is therefore more efficient when its metallic state is favored over its oxidized states (PtO and/or PtO 2 ). Metallic Pt surfaces are more efficient than the oxidized Pt surfaces for the detachment of O atoms from SO 3 species (6).…”

Section: Pgm Catalystsmentioning

confidence: 99%

Heat- and corrosion-resistant catalytic materials for environmental and energy applications

Machida

2021

J. Ceram. Soc. Japan

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“…Up to now, most of the studied catalysts are based on noble metals (Pt, Pd, Rh, Ir, Ru) supported on different materials (Al 2 O 3 , ZrO 2 , TiO 2 , SiC) [11][12][13][14]. These metals are active for the sulfuric acid decomposition and present high resistance to the acidic corrosion [2].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Goethite as a Catalyst for the Thermal Stage of the Westinghouse Process for Hydrogen Production

Fernández-Marchante¹,

Raschitor²,

Mena³

et al. 2021

Catalysts

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This work focuses on the evaluation of goethite as a catalyst for the transformation of sulfuric acid into sulfur dioxide, a reaction with great interest for the hybrid electrochemical-thermoelectrochemical Westinghouse cycle for hydrogen production. A comparison of the performance of goethite with that of CuO, Fe2O3, and SiC has been carried out. Moreover, a mixture of those catalysts was evaluated. The results demonstrate that goethite can be used as a catalyst for the thermal decomposition of sulfuric acid in the Westinghouse cycle, with an activity higher than that of SiC but lower than that of Fe2O3 and CuO. However, it does not undergo sintering during its use, but just produces small particles in its surface, which remain after the treatment. Mixtures of Fe2O3 with SiC or goethite do not produce synergism, thus operating each catalyst in an independent way.

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Catalytic activity of supported metal particles for sulfuric acid decomposition reaction

Cited by 49 publications

References 22 publications

Catalytic SO₃ Decomposition Activity and Stability of Pt Supported on Anatase TiO₂ for Solar Thermochemical Water-Splitting Cycles

Catalytic SO₃ Decomposition Activity and Stability of Pt Supported on Anatase TiO₂ for Solar Thermochemical Water-Splitting Cycles

Heat- and corrosion-resistant catalytic materials for environmental and energy applications

Evaluation of Goethite as a Catalyst for the Thermal Stage of the Westinghouse Process for Hydrogen Production

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Catalytic activity of supported metal particles for sulfuric acid decomposition reaction

Cited by 49 publications

References 22 publications

Catalytic SO3 Decomposition Activity and Stability of Pt Supported on Anatase TiO2 for Solar Thermochemical Water-Splitting Cycles

Catalytic SO3 Decomposition Activity and Stability of Pt Supported on Anatase TiO2 for Solar Thermochemical Water-Splitting Cycles

Heat- and corrosion-resistant catalytic materials for environmental and energy applications

Evaluation of Goethite as a Catalyst for the Thermal Stage of the Westinghouse Process for Hydrogen Production

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Catalytic SO₃ Decomposition Activity and Stability of Pt Supported on Anatase TiO₂ for Solar Thermochemical Water-Splitting Cycles

Catalytic SO₃ Decomposition Activity and Stability of Pt Supported on Anatase TiO₂ for Solar Thermochemical Water-Splitting Cycles