Sour gas shift process over sulfided Co–Mo–K catalysts supported on carbon material — Support characterization and catalytic activity of catalysts

Antoniak‐Jurak, Katarzyna; Kowalik, Paweł; Próchniak, Wiesław; Raróg‐Pilecka, Wioletta; Kuśtrowski, Piotr; Ryczkowski, J.

doi:10.1016/j.fuproc.2015.05.029

Cited by 11 publications

(4 citation statements)

References 33 publications

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“…However, MoS 2 ‐based catalysts are still the most competitive choice due to their lower selectivity to hydrocarbons compared with other Mo catalysts . Moreover, MoS 2 ‐based catalysts doped with transition metals (Co or Ni) have also been applied effectively in water‐gas shift (WGS)/RWGS , , which means that these catalysts have potentials in CO 2 conversion and utilization.…”

Section: Introductionmentioning

confidence: 99%

Activated Carbon‐Supported Mo‐Co‐K Sulfide Catalysts for Synthesizing Higher Alcohols from CO₂

et al. 2019

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Activated carbon-supported Mo-Co-K sulfide catalysts, prepared by stepwise impregnation, were used in the synthesis of higher alcohols via CO 2 hydrogenation. The catalysts with varying Mo contents and defined K/Mo and Co/Mo molar ratios exhibited relatively high CO 2 conversions and high selectivity to total alcohols and C 2+ alcohols. Moreover, the influence of calcination conditions on the sulfidation states and catalytic performance was studied. The surface sulfur runoff of the supported catalysts can be effectively suppressed by online calcination. As a result, the selectivity to total alcohols and C 2+ alcohols can be improved.

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Section: Introductionmentioning

confidence: 99%

Activated Carbon‐Supported Mo‐Co‐K Sulfide Catalysts for Synthesizing Higher Alcohols from CO₂

et al. 2019

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“…Transition-metal sulfides, molybdenum sulfide (MoS 2 ), in particular, are good hydrogenation (HYD), dehydrogenation, and hydrogenolysis catalysts that are intrinsically tolerant to H 2 S. Indeed, MoS 2 has been shown to be active for methane coupling and alkane dehydrogenation − in addition to its traditional use in hydrotreating, hydrodesulfurization (HDS), , water gas shift (WGS), and alcohol production . Few studies have shown that transition-metal sulfide catalysts can be high-performance sour gas-tolerant catalysts for the WGS reaction. − We begin with the description of the structure of MoS 2 catalyst and the relevant chemistries it can catalyze.…”

Section: Introductionmentioning

confidence: 99%

Inhibitor, Co-Catalyst, or Co-Reactant? Probing the Different Roles of H₂S during CO₂ Hydrogenation on the MoS₂ Catalyst

et al. 2019

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Natural gas is often sour, containing varying amounts of H2S and CO2. Gas sweetening processes that are routinely used rely on processes such as amine-based adsorption–desorption cycles, membrane separation, and cryogenic technologies which are energy-intensive and reject CO2. This work explores the mechanism and nature of active sites for hydrogenation (HYD) of CO2 in the presence of H2S on MoS2, a sulfur-tolerant catalyst, using steady-state kinetics studies and density functional theory calculations. In the absence of H2S, this reaction is positive order in CO2 and H2 and negative order in CO and H2O; the system, further, shows no H/D kinetic isotope effect, thereby indicating that C–O scission is rate-controlling. The specific mechanism at play, namely, redox or associative, could, however, not be adequately resolved with the available data. In the presence of H2S, the rate first drops (until about 60 ppm co-feed) and, then, increases (at >200 ppm), indicating a complex functional relationship of the reaction system with H2S. A combination of the ab initio phase diagram, kinetic experiments, and H2S/D2 scrambling studies indicate that (i) the edge structure of the molybdenum sulfide catalyst varies substantially with reaction conditions and co-feeds, (ii) multiple types of sites are at play, in particular, a sulfur-poor site that is active but prone to H2S poisoning and a sulfur-rich site that is less active but tolerant to sulfur with a preponderance of data pointing to these being coordinative unsaturated (CUS) and brim sites, respectively, on the metal edge, and (iii) H2S inhibits CO2 HYD by dissociatively adsorbing on these CUS sites at low co-feeds (0–60 ppm), reacts with CO2 to produce COS and CO at high co-feeds (>1000 ppm) and assists (or co-catalyzes) HYD by probably acting as a hydrogen shuttle at intermediate co-feeds.

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“…Carbon-based supports like activated carbon and carbon nanotubes [17][18][19][20][21][22] are gaining attention because of their chemical stability and surface chemistry tunability. However, the main problem related to these materials is that their production is usually highly energy consuming.…”

Section: Introductionmentioning

confidence: 99%

Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO2 Catalysts for CO2 Methanation

et al. 2021

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Ceria- and urea-doped activated biochars were used as support for Ni-based catalysts for CO2 methanation purposes. Different materials were prepared and tested to find the best catalytic formulation. After several CO2 methanation experiments—carried out at 0.35–1.0 MPa and 300–500 °C—it was found that the most suitable catalyst was a wheat-straw-derived activated biochar loaded with 30 wt.% of CeO2 and 20 wt.% of Ni. Using this catalyst, a CO2 conversion of 65% with a CH4 selectivity of 95% was reached at 1.0 MPa, 400 °C, and 13,200 h−1. From the study of the influence of the gas hourly space velocity, it was deduced that the most likely reaction mechanism was a reverse water–gas shift reaction, followed by CO hydrogenation. N-doping of the carbon support as an alternative to the use of ceria was also investigated. However, both CO2 conversion and selectivity toward CH4 values were clearly lower than those obtained for the ceria-containing catalyst cited above. The outcomes of this work indicate that a renewable biomass-derived support can be effectively employed in the catalytic conversion of CO2 to methane.

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Sour gas shift process over sulfided Co–Mo–K catalysts supported on carbon material — Support characterization and catalytic activity of catalysts

Cited by 11 publications

References 33 publications

Activated Carbon‐Supported Mo‐Co‐K Sulfide Catalysts for Synthesizing Higher Alcohols from CO₂

Activated Carbon‐Supported Mo‐Co‐K Sulfide Catalysts for Synthesizing Higher Alcohols from CO₂

Inhibitor, Co-Catalyst, or Co-Reactant? Probing the Different Roles of H₂S during CO₂ Hydrogenation on the MoS₂ Catalyst

Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO2 Catalysts for CO2 Methanation

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Sour gas shift process over sulfided Co–Mo–K catalysts supported on carbon material — Support characterization and catalytic activity of catalysts

Cited by 11 publications

References 33 publications

Activated Carbon‐Supported Mo‐Co‐K Sulfide Catalysts for Synthesizing Higher Alcohols from CO2

Activated Carbon‐Supported Mo‐Co‐K Sulfide Catalysts for Synthesizing Higher Alcohols from CO2

Inhibitor, Co-Catalyst, or Co-Reactant? Probing the Different Roles of H2S during CO2 Hydrogenation on the MoS2 Catalyst

Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO2 Catalysts for CO2 Methanation

Contact Info

Product

Resources

About

Activated Carbon‐Supported Mo‐Co‐K Sulfide Catalysts for Synthesizing Higher Alcohols from CO₂

Activated Carbon‐Supported Mo‐Co‐K Sulfide Catalysts for Synthesizing Higher Alcohols from CO₂

Inhibitor, Co-Catalyst, or Co-Reactant? Probing the Different Roles of H₂S during CO₂ Hydrogenation on the MoS₂ Catalyst