New catalysts for hydrogen production from H 2 S: Preliminary results

Güldal, N.Ö.; Figen, Halit Eren; Baykara, S.Z.

doi:10.1016/j.ijhydene.2015.02.107

Cited by 69 publications

(35 citation statements)

References 40 publications

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“…Molybdenum-and vanadium-containing perovskite electrocatalysts have been synthesized by the sol-gel citrate method, structurally inspected by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), and thermogravimetric analysis (TGA) techniques; and they were studied in terms of chemical performance using the catalyst testing system according to the procedures, details of which are given in previous publications. [45][46][47] TGA results are presented in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Molybdenum‐ and vanadium‐containing perovskite electrocatalysts for dissociation of H ₂ S

et al. 2019

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Summary Catalytic operations, achieving considerable energy savings, continue getting wider application especially in clean energy systems. Perovskite materials, owing to their chemical and thermal stability, can be conveniently used as catalysts and electrode materials at wide temperature ranges. Hydrogen sulfide (H2S) offers a new and abundant source of hydrogen, the ultimate energy carrier. In the present work, change in electrical conductivity of catalysts obtained by adding molybdenum (Mo) and vanadium (V) as B to the perovskite structure with lanthanum (La) and strontium (Sr) as A and A′, respectively, has been studied within a temperature range of up to 1100 K. Samples La0.75Sr0.25MoO3 and LaSr0.5V0.5O3 demonstrated the highest values of conductivity at 1100 K. At lower temperatures, Cr‐added Mo and V catalysts La0.9Sr0.1Cr0.5Mo0.5O3 and La0.9Sr0.1Cr0.5V0.5O3 had higher conductivity, closely followed by LaSr0.5V0.5O3.

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Section: Methodsmentioning

confidence: 99%

Molybdenum‐ and vanadium‐containing perovskite electrocatalysts for dissociation of H ₂ S

et al. 2019

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“…The comparison of (4) and (5) revealed that both equations reflect the same reaction behavior, though (4) describes the concentration change macroscopically while (5) describes it microscopically. Both equations describe the chemical changes that occur when the reacting components absorb a certain amount of energy.…”

Section: International Journal Of Photoenergymentioning

confidence: 98%

“…The direct degradation of H 2 S for production of hydrogen and sulfur has been the research focus of domestic and foreign researchers, since it can effectively control the H 2 S pollution produced during oil, gas, coal, and mineral processing and also achieve the recycling of hydrogen energy. The main methods of H 2 S degradation for hydrogen and sulfur production include thermal degradation [4,5], electrochemical degradation [6], photocatalytic degradation [7][8][9], and plasma degradation [10,11]. Herein, photocatalytic degradation of H 2 S is the most promising technology due to the high treatment efficiency and reaction rate.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling and Mechanism of VUV Photodegradation of H₂S in the Absence of O₂

Ding

et al. 2018

International Journal of Photoenergy

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The existence of H2S has limited the biogas energy promotion. The traditional photodegradation of H2S is usually conducted in the presence of O2, yet this is unsuitable for biogas desulfurization which should be avoided. Therefore, the ultraviolet degradation of H2S in the absence of O2 was investigated for the first time in the present study from a mathematical point of view. Light wavelength and intensity applied were 185 nm and 2.16 × 10−12 Einstein/cm2·s, respectively. Firstly, the mathematical model of H2S photodegradation was established with MATLAB software, including the gas flow distribution model and radiation model of photoreactor, kinetics model, mass balance model, and calculation model of the degradation rate. Then, the influence of the initial H2S concentration and gas retention time on the photodegradation rate were studied, for verification of the mathematical model. Results indicated that the photodegradation rate decreased with the increase in initial H2S concentration, and the maximum photodegradation rate reached 62.8% under initial concentration of 3 mg/m3. In addition, the photodegradation rate of H2S increased with the increase in retention time. The experimental results were in good accordance with the modeling results, indicating the feasibility of the mathematical model to simulate the photodegradation of H2S. Finally, the intermediate products were simulated and results showed that the main photodegradation products were found to be H2 and elemental S, and concentrations of the two main products were close and agreed well with the reaction stoichiometric coefficients. Moreover, the concentration of free radicals of H• and SH• was rather low.

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“…[97,98] Because highert emperatures (above1 200 8C) are required to obtain an H 2 yield above 30 %, [99] La 2 SrO x was used as an effective catalyst to decrease the temperature to 950 8Ct oo btain the highest conversion of 35.7 %f or the decomposition of H 2 S. [100] The resultsf rom the laboratory-scale extraction pilot plant unit for the separation of H 2 Sf rom Black Sea deep water enabled the buildingo fa ni ndustrial extraction pilot plant to concentrate H 2 Sf rom 10 ppm to above 10 000 ppm. [101] The processing of 10 9 m 3 of water containing 10 ppm H 2 Sw ould produce only 0.833 tons of H 2 .…”

Section: Hydrogenfrom Black Sea Deep Watermentioning

confidence: 99%

Fuel Production from Seawater and Fuel Cells Using Seawater

2017

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Seawater is the most abundant resource on our planet and fuel production from seawater has the notable advantage that it would not compete with growing demands for pure water. This Review focuses on the production of fuels from seawater and their direct use in fuel cells. Electrolysis of seawater under appropriate conditions affords hydrogen and dioxygen with 100 % faradaic efficiency without oxidation of chloride. Photoelectrocatalytic production of hydrogen from seawater provides a promising way to produce hydrogen with low cost and high efficiency. Microbial solar cells (MSCs) that use biofilms produced in seawater can generate electricity from sunlight without additional fuel because the products of photosynthesis can be utilized as electrode reactants, whereas the electrode products can be utilized as photosynthetic reactants. Another important source for hydrogen is hydrogen sulfide, which is abundantly found in Black Sea deep water. Hydrogen produced by electrolysis of Black Sea deep water can also be used in hydrogen fuel cells. Production of a fuel and its direct use in a fuel cell has been made possible for the first time by a combination of photocatalytic production of hydrogen peroxide from seawater and dioxygen in the air and its direct use in one‐compartment hydrogen peroxide fuel cells to obtain electric power.

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New catalysts for hydrogen production from H 2 S: Preliminary results

Cited by 69 publications

References 40 publications

Molybdenum‐ and vanadium‐containing perovskite electrocatalysts for dissociation of H ₂ S

Molybdenum‐ and vanadium‐containing perovskite electrocatalysts for dissociation of H ₂ S

Mathematical Modeling and Mechanism of VUV Photodegradation of H₂S in the Absence of O₂

Fuel Production from Seawater and Fuel Cells Using Seawater

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New catalysts for hydrogen production from H 2 S: Preliminary results

Cited by 69 publications

References 40 publications

Molybdenum‐ and vanadium‐containing perovskite electrocatalysts for dissociation of H 2 S

Molybdenum‐ and vanadium‐containing perovskite electrocatalysts for dissociation of H 2 S

Mathematical Modeling and Mechanism of VUV Photodegradation of H2S in the Absence of O2

Fuel Production from Seawater and Fuel Cells Using Seawater

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Molybdenum‐ and vanadium‐containing perovskite electrocatalysts for dissociation of H ₂ S

Molybdenum‐ and vanadium‐containing perovskite electrocatalysts for dissociation of H ₂ S

Mathematical Modeling and Mechanism of VUV Photodegradation of H₂S in the Absence of O₂