Insights into promoter-enhanced aqueous phase CO hydrogenation over Co@TiO2 mesoporous nanocomposites

Gahtori, Jyoti; Singh, Gurmeet; Tucker, Chelsea L.; Steen, Eric van; Biradar, Ankush V.; Bordoloi, Ankur

doi:10.1016/j.fuel.2021.122402

Cited by 10 publications

(6 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…and Ma et al that include H 2 O partial pressure in their inhibition term have close-to-null constants for said term. It is consistent with our previous study and indicates that the aqueous medium likely does not significantly inhibit the conversion of CO.…”

Section: Resultssupporting

confidence: 93%

“…In a previous study by the authors of this article, the platinum-promoted, titania-supported catalyst was shown to exhibit even higher activities of 0.7 to 2.55 (mol CO ·mol Co –1 ·h –1 ) between 433 and 473 K. The only other cobalt-based catalyst at the time shown to exhibit a higher activity under the aqueous phase was PVP (polyvinylpyrrolidone) stabilized 10% Pt–Co nanoparticles prepared by Wang et al, which was found to have a remarkably high CO conversion rate of 1.1 (mol CO ·mol Co –1 ·h –1 ) at a lower temperature of 433 K (only tested under one temperature).…”

Section: Resultsmentioning

confidence: 77%

“…The rate of CO consumption (mol CO ·mol Co –1 ·h –1 ) of 1PCCN (excluding CO 2 ) was compared over this temperature range to other catalyst studies under similar conditions for aqueous-phase Fischer–Tropsch synthesis. ,,, This comparison is shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Highly Efficient ZIF-67-Derived PtCo Alloy–CN Interface for Low-Temperature Aqueous-Phase Fischer–Tropsch Synthesis

Gahtori

Tucker

Khan

et al. 2022

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Designing new materials for selective Fischer–Tropsch synthesis (FTS) is an elegant way to enhance local feedstock utilization like biomass and waste. In this approach, we have designed a thermally and chemically stable bimetallic PtCo/NC hybrid nanocomposite catalyst derived from a zeolitic imidazolate framework (ZIF-67, which contains cobalt as a metal center) through carbonization for low-temperature (413–473 K) aqueous-phase Fischer–Tropsch synthesis (AFTS). The selectivity of the desired range of hydrocarbons is adjusted using a highly dispersed PtCo bimetallic alloy, which facilitates extraordinary reduction of a metal oxide to active species by the synergic effect under the AFTS reaction conditions. The ZIF-derived catalyst tested in this study exhibited the highest activity to date for very low temperatures (433 K) in aqueous-phase Fischer–Tropsch synthesis with CO conversion rates between 0.61 and 1.20 molCO·molCo –1·h–1. Insights of the remarkable catalyst activity were examined by in situ X-ray photoelectron spectroscopy (XPS) studies corroborated by density functional theory (DFT) calculation. The bimetallic Co3Pt (111) surface was found to be highly active for the C–C coupling reaction between surface-adsorbed C and CO, forming a CCO intermediate with a very low activation barrier (E a = 0.37 eV), in comparison to the C–C coupling activation barrier obtained over the Co (111) surface (E a = 0.87 eV). This unique approach and observations create a new path for developing next-generation advanced catalyst systems and processes for selective low-temperature FTS.

show abstract

Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 77%

See 1 more Smart Citation

Highly Efficient ZIF-67-Derived PtCo Alloy–CN Interface for Low-Temperature Aqueous-Phase Fischer–Tropsch Synthesis

Gahtori

Tucker

Khan

et al. 2022

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Mo-promoted and Pt-promoted Co/TiO 2 catalyst reported by Gahtori et al [41] showed similar C 5+ selectivity (62%) compared to the 20% Co/SBA-15 catalyst only at lower temperatures (<180°C) but at the expense of very low carbon monoxide conversion (20%). The cobalt-based mesoporous catalyst developed by Oliveira et al [42] showed better C 5+ selectivity (81%) than the 20% Co/SBA-15 catalyst at similar operating conditions (210°C, 1.0 H 2 :CO ratio).…”

Section: Catalytic Evaluation In Ftsmentioning

confidence: 77%

Fischer-Tropsch Synthesis on Co/SBA-15 Catalyst: Characterization and Oligomerization Modeling

Menezes¹,

Paula²,

Lima³

et al. 2022

View full text Add to dashboard Cite

In this study, we investigated the oligomerization mechanism of the Fischer-Tropsch synthesis catalyzed by a cobalt-based catalyst supported by SBA-15. The Co/SBA-15 catalyst contained 20% w/w of cobalt. It was prepared by the wet impregnation method and characterized by X-ray diffraction (XRD), N2 adsorption-desorption, temperature-programmed reduction (TPR), and scanning electron microscopy coupled to X-ray energy dispersion spectroscopy (SEM-EDS). The FT synthesis was conducted in a slurry bed reactor operating at 240–270°C, 2.0–3.0 MPa, and 1:1–2:1 H2:CO ratio (mol:mol). An oligomerization model, based on alkyl and alkenyl mechanisms for hydrocarbon chain propagation, was used for product distribution. Impregnation with cobalt and calcination did not alter the structure of SBA-15. Cobalt oxides, including Co2O3 and Co3O4, were the active phases of the reaction. Adding cobalt to the support lowered the specific surface area and the pore volume of the support but did not change the structure of SBA-15. Fischer-Tropsch synthesis and C5+ hydrocarbon selectivity increased at a low H2:CO ratio (1.0) and low temperatures (240–255°C). The content of branched-chain paraffin and olefins increased with a decrease in the H2:CO ratio and temperature. The parameters of the model were estimated, and the assumption of a dual mechanism was satisfied.

show abstract

“…Using an aqueous phase batch reactor ensures that the reactants are dispersed equally, exposing all the catalyst particles to the same concentration of gas molecules. 5 The water was chosen as a solvent, presuming its promotional effect in activating the CO 2 molecules at a relatively lower temperature, like the reports published for CO activation. 6 Hence, considering the importance of aqueous phase methanol synthesis, the design of a catalyst system that may enable it to operate at low reaction temperatures while maintaining superior catalytic performance is highly desirable.…”

mentioning

confidence: 99%

Boosting the methanol selectivity in CO₂ hydrogenation over a MOF-derived CuZn@CN catalyst via Rb incorporation

Gahtori,

Kaishyop,

Singh

et al. 2023

Chem. Commun.

Self Cite

View full text Add to dashboard Cite

show abstract

Insights into promoter-enhanced aqueous phase CO hydrogenation over Co@TiO2 mesoporous nanocomposites

Cited by 10 publications

References 69 publications

Highly Efficient ZIF-67-Derived PtCo Alloy–CN Interface for Low-Temperature Aqueous-Phase Fischer–Tropsch Synthesis

Highly Efficient ZIF-67-Derived PtCo Alloy–CN Interface for Low-Temperature Aqueous-Phase Fischer–Tropsch Synthesis

Fischer-Tropsch Synthesis on Co/SBA-15 Catalyst: Characterization and Oligomerization Modeling

Boosting the methanol selectivity in CO₂ hydrogenation over a MOF-derived CuZn@CN catalyst via Rb incorporation

Contact Info

Product

Resources

About

Insights into promoter-enhanced aqueous phase CO hydrogenation over Co@TiO2 mesoporous nanocomposites

Cited by 10 publications

References 69 publications

Highly Efficient ZIF-67-Derived PtCo Alloy–CN Interface for Low-Temperature Aqueous-Phase Fischer–Tropsch Synthesis

Highly Efficient ZIF-67-Derived PtCo Alloy–CN Interface for Low-Temperature Aqueous-Phase Fischer–Tropsch Synthesis

Fischer-Tropsch Synthesis on Co/SBA-15 Catalyst: Characterization and Oligomerization Modeling

Boosting the methanol selectivity in CO2 hydrogenation over a MOF-derived CuZn@CN catalyst via Rb incorporation

Contact Info

Product

Resources

About

Boosting the methanol selectivity in CO₂ hydrogenation over a MOF-derived CuZn@CN catalyst via Rb incorporation