A Method for the Simultaneous Cleansing of H<sub>2</sub>S and SO<sub>2</sub>

Uzun, Dzhamal; Razkazova-Velkova, Elena; Beschkov, V.; Petrov, Κ.

doi:10.1155/2016/7628761

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…Cr2O7 2-+ 6 Cr 2+ + 14 H + → 8 Cr 3+ + 7 H2O 2 Cr 3+ + 3 MnO2 + 2 H2O → 2 HCrO4 -+ 3 Mn 2+ + 2 H + 2 HCrO4 -→ Cr2O7 2-+ H2O (Liang et al, 2021;Szabó et al, 2018;Topich et al, 2004, p. 59 (Kalmus, 1914;Sakka, 1991;马 et al, 2003, p. 480) Group 10 7 NiS2 + Ni3S2 → 4 NiS 3 NiS + H2 → Ni3S2 + H2S (Delafosse et al, 1962;Delafosse and Barret, 1961) Group 11 9 Cu + Cu 2+ → 2 Cu + Cu + + Fe 3+ → Cu 2+ + Fe 2+ (Bjergbakke et al, 1976;Ciavatta et al, 1980;Orth et al, 1989) Group 12 7 Hg + Hg 2+ → Hg2 2+ Hg2 2+ + 2 Fe 2+ → 2 Hg + 2 Fe 3+ (Kozin and Hansen, 2013;Raposo et al, 2000) Group 13 14 2 B2O3 + 2 B → 3 B2O2 B2O2 + 2 H2 → 2 B + H2O (Inghram et al, 1956;Sommer et al, 1963;Wang et al, 2008) Group 14 22 C + CO2 → 2 CO CO + FeO → Fe + CO2 (Wilson and Bremner, 1948) Group 15 25 HNO2 + HNO3 → 2 NO2 + H2O 2 NO2 + Cu + 2 H + → 2 HNO2 + Cu 2+ (Abd El Aal et al, 1992;Evans, 1944) Group 16 32 SO2 + 2 H2S → 3 S + 2 H2O S + O2 → SO2 (Patnaik, 2003, p. 892;Steudel, 2003;Uzun et al, 2016) Group 17 21 HCl + HOCl → Cl2 + H2O Cl2 + H2 → 2 HCl (Lister, 1952;Patnaik, 2003, p. 210) Group 18 4 XeF4 + Xe → 2 XeF2 XeF2 + F2 → XeF4 (Claassen et al, 1962;Weinstock et al, 1966;马 et al, 2003, p. 332) In addition, the use of the term "comproportionation" in published literature is sometimes not necessarily associated with redox reactions following the pattern shown in Fig. 1A, but only emphasizes a specific stoichiometric relationship (IUPAC, 1997b…”

Section: Count Of Compacs Representative Compac Referencesmentioning

confidence: 99%

An assessment of stoichiometric autocatalysis across element groups

Peng

Kaçar

Fahrenbach

et al. 2023

Preprint

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Autocatalytic chemical reaction systems have been proposed to play critical roles during the transition from an abiotic world to one that contains living systems. These proposals are at odds with a limited number of known examples of abiotic (and in particular, inorganic) autocatalytic systems that might reasonably function in a prebiotic environment. In this study, we broadly assess the occurrence of stoichiometries that can support autocatalytic chemical systems through comproportionation reactions. If the product of a comproportionation process can be coupled with an auxiliary oxidation or reduction pathway that furnishes a reactant, then a candidate comproportionation-based autocatalytic cycle (CompAC) structure can exist. Using this strategy, we surveyed the literature and chemical databases for reactions that can be organized into CompACs that consume some chemical species as food to synthesize more autocatalysts. 226 CompACs and 44 Broad-sense CompACs were documented, and it was found that each of the 18 groups, lanthanoid series, and actinoid series in the periodic table has at least two CompACs. Our findings demonstrate that stoichiometric relationships underpinning abiotic autocatalysis could broadly exist across a range of geochemical and cosmochemical conditions, some of which are substantially different from the modern Earth. At the same time, the observation of some autocatalytic systems requires effective spatial or temporal separation between the food chemicals while allowing comproportionation and auxiliary reactions to proceed, which may explain why naturally occurring autocatalytic systems are not frequently observed. The collated CompACs and the conditions in which they might plausibly support complex, “life-like” chemical dynamics, can directly aid an expansive assessment of life’s origins and provide a compendium of alternative hypotheses concerning false-positive biosignatures.

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Section: Count Of Compacs Representative Compac Referencesmentioning

confidence: 99%

An assessment of stoichiometric autocatalysis across element groups

Peng

Kaçar

Fahrenbach

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…It has been shown that atmospheric SO 2 has a detrimental effect, not only on the environment but also human life [5,6]. With more countries and governments enforcing limitations on industry to reduce SO 2 emissions [5][6][7], new technologies are emerging for either the capture [8] or reutilisation of SO 2 [9,10].…”

Section: Introductionmentioning

confidence: 99%

Behavior of S, SO, and SO3 on Pt (001), (011), and (111) surfaces: A DFT study

Ungerer

Sittert

Leeuw

2021

The Journal of Chemical Physics

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In the hybrid sulphur (HyS) cycle, the reaction between SO 2 and H 2 O is manipulated to produce hydrogen, with water and sulphuric acid as by-products. However, sulphur poisoning of the catalyst has been widely reported to occur in this cycle, which is due to strong chemisorption of sulphur on the metal surface. The catalysts may deactivate as a result of these impurities present in the reactants or incorporated in the catalyst during its preparation and operation of the HyS cycle.Here, we report a density functional theory (DFT) investigation of the interaction between S, SO and SO 3 with the Pt (001), ( 011) and ( 111) surfaces. First, we have investigated the adsorption of single gas phase molecules on the three Pt surfaces. During adsorption, the 4F hollow sites on the (001) and (011) surfaces and the fcc hollow site on the (111) surface were preferred. S adsorption followed the trend of (001) 4F > (011) 4F > (111) fcc , while SO adsorption showed (001) 4F > (011) bridge/4F > (111) fcc and SO 3 adsorption was most stable in a S,O,O bound configuration on the (001) 4F > (011) 4F > (111) fcc sites.The surface coverage was increased on all the surfaces until a monolayer was obtained. The highest surface coverage for S shows the trend (001) S = (111) S > (011) S , and for SO it is (001) SO > (011) SO > (111) SO , similar to SO 3 where we found (001) SO3 > (011) SO3 > (111) SO3 . These trends indicate that the (001) surface is more susceptible to S species poisoning. It was also evident that both the (001) and (111) surfaces were reactive towards S, leading to the formation of S 2 . High coverage of SO 3 showed the formation of SO 2 and SO 4 , especially on the (011) surface. The thermodynamics indicated that an increased temperature up to 2000 K resulted in Pt surfaces fully covered with elemental S. The SO coverage showed θ ≥ 1.00 on both the (001) and (011) surfaces, and θ = 0.78 for the (111) in the experimental region where the HyS cycle is operated. Lower coverages of SO 3 were observed due to the size of the molecule.

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Assessment of Stoichiometric Autocatalysis across Element Groups

Peng,

Adam,

Fahrenbach

et al. 2023

J. Am. Chem. Soc.

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Autocatalysis has been proposed to play critical roles during abiogenesis. These proposals are at odds with a limited number of known examples of abiotic (and, in particular, inorganic) autocatalytic systems that might reasonably function in a prebiotic environment. In this study, we broadly assess the occurrence of stoichiometries that can support autocatalytic chemical systems through comproportionation. If the product of a comproportionation reaction can be coupled with an auxiliary oxidation or reduction pathway that furnishes a reactant, then a Comproportionation-based Autocatalytic Cycle (CompAC) can exist. Using this strategy, we surveyed the literature published in the past two centuries for reactions that can be organized into CompACs that consume some chemical species as food to synthesize more autocatalysts. 226 CompACs and 44 Broad-sense CompACs were documented, and we found that each of the 18 groups, lanthanoid series, and actinoid series in the periodic table has at least two CompACs. Our findings demonstrate that stoichiometric relationships underpinning abiotic autocatalysis could broadly exist across a range of geochemical and cosmochemical conditions, some of which are substantially different from the modern Earth. Meanwhile, the observation of some autocatalytic systems requires effective spatial or temporal separation between the food chemicals while allowing comproportionation and auxiliary reactions to proceed, which may explain why naturally occurring autocatalytic systems are not frequently observed. The collated CompACs and the conditions in which they might plausibly support complex, “life-like” chemical dynamics can directly aid an expansive assessment of life’s origins and provide a compendium of alternative hypotheses concerning false-positive biosignatures.

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A Method for the Simultaneous Cleansing of H₂S and SO₂

Cited by 4 publications

References 19 publications

An assessment of stoichiometric autocatalysis across element groups

An assessment of stoichiometric autocatalysis across element groups

Behavior of S, SO, and SO3 on Pt (001), (011), and (111) surfaces: A DFT study

Assessment of Stoichiometric Autocatalysis across Element Groups

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A Method for the Simultaneous Cleansing of H2S and SO2

Cited by 4 publications

References 19 publications

An assessment of stoichiometric autocatalysis across element groups

An assessment of stoichiometric autocatalysis across element groups

Behavior of S, SO, and SO3 on Pt (001), (011), and (111) surfaces: A DFT study

Assessment of Stoichiometric Autocatalysis across Element Groups

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Product

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A Method for the Simultaneous Cleansing of H₂S and SO₂