Hydrogen production from waste-derived synthesis gas over Ni()Fe(3-)-CeO2 catalyst: optimization of Ni/Fe ratio

Heo, Yu-Seung; Jeon, Kyung-Won; Kim, Hak-Min; Cheon, Beom-Su; Jin, Hong-Deok; Jeong, Dae-Woon

doi:10.1016/j.ijhydene.2023.03.007

Cited by 5 publications

(6 citation statements)

References 93 publications

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“…8,10,56 The surface oxygen species are associated with adsorbed hydroxyl groups or water. 8,10,56 The calculation of the concentration of defective oxygen atoms was done using the O D peak area. The concentrations of defective oxygen atoms in the promoted and unpromoted Co-CeO 2 catalysts are listed in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…The lattice oxygen species are located in the CeO 2 framework . The defective oxygen species correspond to mobile oxygen ions related to oxygen vacancies. ,, The surface oxygen species are associated with adsorbed hydroxyl groups or water. ,, The calculation of the concentration of defective oxygen atoms was done using the O D peak area. The concentrations of defective oxygen atoms in the promoted and unpromoted Co-CeO 2 catalysts are listed in Table .…”

Section: Resultsmentioning

confidence: 99%

“…44 The defective oxygen species correspond to mobile oxygen ions related to oxygen vacancies. 8,10,56 The surface oxygen species are associated with adsorbed hydroxyl groups or water. 8,10,56 The calculation of the concentration of defective oxygen atoms was done using the O D peak area.…”

Section: Resultsmentioning

confidence: 99%

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Improving the Performance of a Co-CeO₂ Catalyst for Hydrogen Production via Water Gas Shift Reaction by Addition of Transition Metal Oxides

Kim,

Jeong,

Cheon

et al. 2024

Energy Fuels

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The hydrogen production from combustible waste is attracting attention because of the increasing interest in clean and renewable hydrogen production. To produce hydrogen from combustible waste, gasification and water gas shift reaction processes are required. Syngas, which mainly consists of hydrogen and carbon monoxide, is generated by gasification of combustible waste. The water gas shift reaction is applied to produce additional hydrogen from carbon monoxide in waste-derived syngas. The performance of catalysts is important to achieve reasonable process efficiency. Co-based catalysts were applied to the water gas shift reaction because Co has significant capability for CO oxidation and high reaction rates when it is used as an active metal. However, it was necessary to enhance the stability of Cobased catalysts. Here, different transition metal oxides (TiO 2 , ZrO 2 , V 2 O 5 , and Nb 2 O 5 ) are used as promoters to enhance the Co-CeO 2 catalyst performance. To investigate the effects of promoters on the catalytic performance, various properties are characterized. According to the analysis results, the physicochemical properties, which determine the catalytic performance, were influenced by the addition of transition metal oxides. Among the synthesized catalysts, the Nb 2 O 5 -promoted Co-CeO 2 catalyst exhibited the best catalytic performance. As a result, the Nb 2 O 5 promoter is the most effective to improve the catalytic activity and stability of the Co-CeO 2 catalyst for high-temperature water gas shift reaction to produce hydrogen from waste-derived syngas. The higher CO conversion is related to the numerous oxygen vacancies and high Co dispersion, while stability is related to strong interactions between Co and the support. These findings are expected to aid the development of catalysts by confirming physicochemical properties relating with catalytic performance.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Improving the Performance of a Co-CeO₂ Catalyst for Hydrogen Production via Water Gas Shift Reaction by Addition of Transition Metal Oxides

Kim,

Jeong,

Cheon

et al. 2024

Energy Fuels

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“…This temperature was maintained for 1 h, then reduced to 350 °C and the WGS reaction was carried out. The simulated waste-derived syngas used in the WGS experiments comprised 37.87 vol % CO, 21.47 vol % CO 2 , 2.30 vol % CH 4 , 29.31 vol % H 2 , and 9.05 vol % N 2 . Water was fed into the system using a syringe pump and vaporized at 180 °C upstream of the reactor.…”

Section: Methodsmentioning

confidence: 99%

“…The simulated waste-derived syngas used in the WGS experiments comprised 37.87 vol % CO, 21.47 vol % CO 2 , 2.30 vol % CH 4 , 29.31 vol % H 2 , and 9.05 vol % N 2 . 36 Water was fed into the system using a syringe pump and vaporized at 180 °C upstream of the reactor. The feed H 2 O/(CH 4 + CO + CO 2 ) ratio was intentionally fixed at 2.0 to avoid coke formation.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Restructuring Co–CoO_x Interface with Titration Rate in Co/Nb-CeO₂ Catalysts for Higher Water–Gas Shift Performance

Negi,

Kim,

Cheon

et al. 2023

ACS Appl. Mater. Interfaces

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H 2 production via water−gas shift reaction (WGS) is an important process and applied widely. Cobalt-modified CeO 2 are promising catalysts for WGS reaction. Herein, a series of Co/Nb−CeO 2 catalysts were prepared by varying the rate of precipitant addition during the coprecipitation method and examined for hydrogen generation through WGS reaction. The rates of precipitant addition were 1, 5, 15, and 25 mL/min. We obtained ceria supported cobalt catalysts with different sizes and morphology such as 3, 8 nm nanoclusters, 30 nm cubic nanoparticles, and 50 nm hexagonal nanoparticles. The well dispersed small cobalt particles in Co/Nb-CeO 2 that was prepared at 5 mL/min titration rate exhibit strong interaction between cobalt oxide and CeO 2 that retards the reduction of CoO x producing Co−CoO x pairs. In contrast, 1-Co/Nb-CeO 2 and 25-Co/Nb-CeO 2 result in bigger and aggregated Co particles, resulting in fewer interfaces with CeO 2 . The Co 0 , Co δ+ , Ce 3+ , and O v species are responsible for improved reducibility in Co/Nb−CeO 2 catalysts and were quantitively measured using XPS, XAS, and Raman spectroscopy. The Co−CoO x interface assists dissociation of the H 2 O molecule; CO oxidation requires low activation energy and realizes a high turnover frequency of 9.8 s −1 . The 5-Co/Nb-CeO 2 catalyst achieved thermodynamic equilibrium equivalent CO conversion with efficient H 2 production during WGS reaction at a gas hourly space velocity of 315,282 h −1 . Successively, the 5-Co/ Nb-CeO 2 catalyst exhibited stable performance for straight 168 h attributed to stable CO−Co δ+ intermediate formation, achieving efficient inhibition of typical CO chemistry over the Co metal, suitable for hydrogen generation from waste derived synthesis gas.

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Hydrogen-rich gas production from tar model compound disintegrates over low-temperature plasma in dielectric barrier discharge reactor

Wang,

Liu,

Xuan

et al. 2024

International Journal of Hydrogen Energy

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Hydrogen production from waste-derived synthesis gas over Ni()Fe(3-)-CeO2 catalyst: optimization of Ni/Fe ratio

Cited by 5 publications

References 93 publications

Improving the Performance of a Co-CeO₂ Catalyst for Hydrogen Production via Water Gas Shift Reaction by Addition of Transition Metal Oxides

Improving the Performance of a Co-CeO₂ Catalyst for Hydrogen Production via Water Gas Shift Reaction by Addition of Transition Metal Oxides

Restructuring Co–CoO_x Interface with Titration Rate in Co/Nb-CeO₂ Catalysts for Higher Water–Gas Shift Performance

Hydrogen-rich gas production from tar model compound disintegrates over low-temperature plasma in dielectric barrier discharge reactor

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Hydrogen production from waste-derived synthesis gas over Ni()Fe(3-)-CeO2 catalyst: optimization of Ni/Fe ratio

Cited by 5 publications

References 93 publications

Improving the Performance of a Co-CeO2 Catalyst for Hydrogen Production via Water Gas Shift Reaction by Addition of Transition Metal Oxides

Improving the Performance of a Co-CeO2 Catalyst for Hydrogen Production via Water Gas Shift Reaction by Addition of Transition Metal Oxides

Restructuring Co–CoOx Interface with Titration Rate in Co/Nb-CeO2 Catalysts for Higher Water–Gas Shift Performance

Hydrogen-rich gas production from tar model compound disintegrates over low-temperature plasma in dielectric barrier discharge reactor

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Improving the Performance of a Co-CeO₂ Catalyst for Hydrogen Production via Water Gas Shift Reaction by Addition of Transition Metal Oxides

Improving the Performance of a Co-CeO₂ Catalyst for Hydrogen Production via Water Gas Shift Reaction by Addition of Transition Metal Oxides

Restructuring Co–CoO_x Interface with Titration Rate in Co/Nb-CeO₂ Catalysts for Higher Water–Gas Shift Performance