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Basic characteristics of sulfide catalysts for the direct decomposition of H2S
Bonnet, Florian; Kaluža, Luděk
2024 - English
Sulfide catalysts are crucial in the hydrodesulfurization (HDS) of petroleum fractions, facilitating the hydrogenolysis of carbon-sulfur bonds. This process generates significant volumes of hydrogen sulfide (H2S), which is typically processed in the Claus unit. However, excess H2S can overwhelm the Claus process, creating both operational and environmental challenges. Researchers are now exploring sulfide catalysts for the direct thermo-catalytic decomposition of H2S to address this issue. Supported catalysts, like Mo/Al2O3, and commercial catalysts, considered typical monolayer-type well-dispersed catalysts, show the highest O2 uptake, ranging from 41.29 μmol/g for MoS2/Al2O3 (KLO) to 58.70 μmol/g for the commercial 715. Unsupported multilayer catalysts, such as Ni/MoWS2 (KKP), exhibit lower O2 uptake at 2.54 μmol/g, though it demonstrates high HDS activity with thiophene. Moreover, O2 uptake effectively describes the sintering of the Mo monolayer phase during the thermocatalytic reaction of H2S at 800°C. These O2 uptakes clearly correlate with the XRD patterns, where the MoS2 phase is X-ray amorphous with an O2 uptake of about 19.04 μmol/g, while the MoS2 phase in the spent catalyst shows certain crystallinity exhibiting an average particle size by Scherrer equation of about 6 nm and the O2 uptake of 1.63 μmol/g. O2 chemisorption thus serves as a valuable measure of the dispersion of Mo sulfides. The results obtain with the study of CoMo/Al2O3 (KJJ-family catalysts), highlight the correlation between the increasing amount of adsorbed O2 with the increasing nominal loading of MoO3 and the increasing rate constant of thiophene kTH. This research reveals the potential of these catalysts in hydrocarbon refining. The findings underline the connection between catalytic chemistry, process engineering, and environmental sustainability, with the objective to enhance industrial refining processes.
Keywords:
sulfide catalyst; O2 chemisorption; H2S decomposition
Available at various institutes of the ASCR
Basic characteristics of sulfide catalysts for the direct decomposition of H2S
Sulfide catalysts are crucial in the hydrodesulfurization (HDS) of petroleum fractions, facilitating the hydrogenolysis of carbon-sulfur bonds. This process generates significant volumes of hydrogen ...
EDWork Manual IV. User Guide to EDWork 4.1
Sobolík, Václav; Wein, Ondřej
2020 - English
The presen report would serve as a user guide to the software package EDWork 4.1.
Keywords:
electrodiffusion technique; edwork manual; user guide
Available at various institutes of the ASCR
EDWork Manual IV. User Guide to EDWork 4.1
The presen report would serve as a user guide to the software package EDWork 4.1.
Direct Decomposition of NO Over Co-Mn-Al Mixed Oxides: Effect of Ce and/or K Promotors.
Jirátová, Květa; Pacultová, K.; Karásková, K.; Balabánová, Jana; Klegová, A.; Obalová, L.
2019 - English
In this contribution, the effect of K and/or Ce on activity of Co-Mn-Al mixed oxides was stud-ied, as presence of Ce could increase mobility of oxygen in the transition metals oxides.\n
Keywords:
Co-Mn-Al; catalysts; metals oxides
Available at various institutes of the ASCR
Direct Decomposition of NO Over Co-Mn-Al Mixed Oxides: Effect of Ce and/or K Promotors.
In this contribution, the effect of K and/or Ce on activity of Co-Mn-Al mixed oxides was stud-ied, as presence of Ce could increase mobility of oxygen in the transition metals oxides.\n
Mesoporous Polymers Created by and Their Application.
Soukupová, Krasimira; Jeřábek, Karel
2018 - English
Keywords:
polymer; mesopores; microsyneresis
Available at various institutes of the ASCR
Mesoporous Polymers Created by and Their Application.
Synthesis and Functionalization of Phenacenes Containing δ-Lactam Ring.
Váňa, Lubomír; Církva, Vladimír; Pfleger, Jiří; Storch, Jan
2018 - English
This work is aimed at the development of a new efficient methodology towards the synthesis of various aza[5]phenacenes containing δ-lactam ring in their structure. Possibilities of their functionalization or derivatization are also discussed, along with complexation properties of suitable aza-derivatives as ligands in transition-metal complexes. The resulting compounds are investigated in terms of their material properties, especially for the formation of thin film structures capable of an efficient semi-conductivity or their potential application as photoluminescent complexes in OLEDs.
Keywords:
phenacene; lactam; organic electronics
Available at various institutes of the ASCR
Synthesis and Functionalization of Phenacenes Containing δ-Lactam Ring.
This work is aimed at the development of a new efficient methodology towards the synthesis of various aza[5]phenacenes containing δ-lactam ring in their structure. Possibilities of their ...
Kinetic Study of a Gas Absorption Into a Liquid Stages 1.1 and 1.2
Stavárek, Petr
2018 - English
Report describes the experimental apparatus and measurements of the kinetics of a gas absorption into a liquid and reports the evaluated results.
Keywords:
experimental apparatus; measurements; gas absorption
Available at various institutes of the ASCR
Kinetic Study of a Gas Absorption Into a Liquid Stages 1.1 and 1.2
Report describes the experimental apparatus and measurements of the kinetics of a gas absorption into a liquid and reports the evaluated results.
Ebulliometric and Static Measurement of Total Pressure in the in the Binary Water + Poly(Ethylene Glycol) System.
Pavlíček, Jan; Bogdanić, Grozdana; Wichterle, Ivan; Izák, Pavel
2018 - English
The total pressure of the systems containing water and three different poly(ethylene glycol)s with nominal molecular weights of 1000, 3000 and 6000 g mol-1 was measured isothermally at 303.15, 308.15, 313.15, 323.15, 333.15, 343.15, 353.15 and 363.15, using the improved static apparatus for lower temperatures and ebulliometrically for higher temperatures, covering the concentration range up to 50 wt % of the polymer. The 343.15 K isotherm was measured by both experimental methods, and both showed good continuity and performance. A lot of additional data have been measured but not yet published, which are integrated here together with our recent measurement.
Keywords:
vapou-liquid equilibrium; polymer system
Available at various institutes of the ASCR
Ebulliometric and Static Measurement of Total Pressure in the in the Binary Water + Poly(Ethylene Glycol) System.
The total pressure of the systems containing water and three different poly(ethylene glycol)s with nominal molecular weights of 1000, 3000 and 6000 g mol-1 was measured isothermally at 303.15, 308.15, ...
Supported Ionic Liquid Membranes for Selective Separation of Volatile Organic Vapour and Pollutants from Gas Stream.
Petrusová, Zuzana
2018 - English
Keywords:
ionic liquid membranes; volatile organic vapour; pollutant
Available at various institutes of the ASCR
Supported Ionic Liquid Membranes for Selective Separation of Volatile Organic Vapour and Pollutants from Gas Stream.
Powder Rheology - Measuring of Properties of Pharmaceutical Particulate Materials.
Kulaviak, Lukáš
2018 - English
Keywords:
rheology; pharmaceutical materials
Available at various institutes of the ASCR
Powder Rheology - Measuring of Properties of Pharmaceutical Particulate Materials.
Microreactor as Efficient Tool for Photooxidation Reactions.
Hejda, Stanislav; Klusoň, Petr
2017 - English
Keywords:
photoreactor; dagradation; photocatalysís
Available at various institutes of the ASCR
Microreactor as Efficient Tool for Photooxidation Reactions.
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