Selective CO methanation in H2-rich stream over Ni–, Co– and Fe/CeO2: Effect of metal and precursor nature

Konishcheva, M.V.; Потемкин, Д.И.; Snytnikov, P.V.; Zyryanova, M. M.; Pakharukova, Vera P.; Simonov, P.A.; Sobyanin, V. A.

doi:10.1016/j.ijhydene.2015.07.071

Cited by 50 publications

(23 citation statements)

References 22 publications

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“…For all samples, the catalytic characteristics were reproducible and stable for at least 20 h. A more detailed description is presented in Ref. . The CO ([CO] out ) and CH 4 ([CH 4 ] out ) outlet concentrations were monitored.…”

Section: Figuresupporting

confidence: 89%

“…Therefore, the design of high‐performance CO‐SMET catalysts remains a challenging problem today. Recently, the chlorine‐doped nickel–ceria system has been suggested for preferential CO methanation . The positive effect of chlorine additives on the catalyst selectivity was also demonstrated in Ref.…”

Section: Figurementioning

confidence: 99%

“…Theh alogen-free Ni/CeO 2 catalyst was prepared by incipient wetness impregnation according to Ref. [11].T he halogenated Ni(F)/CeO 2 ,N i(Cl)/CeO 2 ,a nd Ni(Br)/CeO 2 catalysts were prepared by impregnating the halogen-free Ni/CeO 2 catalyst with an aqueous solution of ammonium fluorite (NH 4 F), ammonium chloride (NH 4 Cl), or ammonium bromide (NH 4 Br), respectively, followed by drying in air at 110 8Ca nd reduction in 5vol %H 2 / He flow at 400 8C. TheNiloading was set to 8wt% and the halogen/Ni molar ratio was set to 2.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…[5][6][7][8] Therefore,t he design of high-performance CO-SMET cata-lysts remainsac hallenging problem today.R ecently,t he chlorine-doped nickel-cerias ystem has been suggested for preferential CO methanation. [9][10][11][12][13] Thep ositive effect of chlorinea dditives on the catalyst selectivity wasa lso demonstrated in Ref. [14][15][16].I tw as associated with the inhibition of the CO 2 methanation reactionb yb locking the ceria surface sites responsible for CO 2 activation.…”

mentioning

confidence: 97%

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Preferential Methanation of CO using Halogen‐Doped (F, Cl, Br) Ceria‐Supported Nickel Catalysts

et al. 2017

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Halogen‐doped Ni(F)/CeO2, Ni(Cl)/CeO2, and Ni(Br)/CeO2 catalysts were prepared by treating halogen‐free Ni/CeO2 with aqueous solutions of NH4F, NH4Cl, and NH4Br, respectively. It was demonstrated that the halogen dopants had distinct effects on the catalyst properties for the CO preferential methanation using realistic reformate gas: fluorine did not change catalytic activity, chlorine inhibited CO2 methanation activity and provided high selectivity towards CO methanation, and bromine completely inhibited both the CO and CO2 methanation activity.

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Section: Figuresupporting

confidence: 89%

Section: Figurementioning

confidence: 99%

Section: Catalyst Preparationmentioning

confidence: 99%

mentioning

confidence: 97%

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Preferential Methanation of CO using Halogen‐Doped (F, Cl, Br) Ceria‐Supported Nickel Catalysts

et al. 2017

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“…Simultaneously, the total number of highly dispersed nickel species may also increase with nickel loading ( Concentration of methane in the reaction products was detected to be very low for maximum values below 0.022-0.037 vol % at 300-350 • C (Figure 4b), showing negligible secondary methanation reaction for these catalysts in the feed with the excess of H 2 O. The most promising for methanation reaction was found to be 2 wt % Ni/CeO 2 catalyst [17][18][19]. As shown in the literature [20][21][22][23][24], methanation at the surface of supported Ni catalysts is highly structure-sensitive and is also sensitive to the presence of hydrogen.…”

Section: Experimental Observationmentioning

confidence: 98%

Water–Gas Shift Reaction over Ni/CeO2 Catalysts

et al. 2017

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This paper reports the results of a study of a water-gas shift reaction over nickel-ceria catalysts with different metal loading. Within this study, the overall CO conversion and observed kinetic behavior were investigated over the temperature range of 250-550 • C in different reactor configurations (fixed-bed and microchannel reactors). The quasi-steady state kinetics of the CO water-gas shift reaction was studied for fractions of Ni-containing cerium oxide catalysts in fixed-bed experiments at lab-scale level using a very dilute gas (1% CO + 1.8% H 2 O in He). A set of experiments with a microchannel reactor was performed using the feed composition (CO:H 2 O:H 2 :N 2 = 1:2:2:2), representing a product gas from methane partial oxidation. The results were interpreted using computational models. The kinetic parameters were determined by regression analysis, while mechanistic aspects were considered only briefly. Simulation of the WGS reaction in the microreactor was also carried out by using the COMSOL Multiphysics program.

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Effect of SiO₂ on the CO Selective Methanation over SiO₂/Ni‐ZrO₂ Catalysts

Guo

et al. 2021

ChemCatChem

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CO selective methanation is a reliable and efficient method for deep CO removal from H 2 -rich reformate gases in proton exchange membrane fuel cell (PEMFC). In this study, a series of SiO 2 /Ni-ZrO 2 catalysts with different mass fractions of SiO 2 was prepared for CO selective methanation, and the structures and surface chemical properties of Ni-ZrO 2 could be controlled by SiO 2 . It was found that SiO 2 greatly increased the specific surface areas of the catalyst and the dispersion of supported metallic Ni, which endowed the catalyst with higher active Ni surface area and then increased the adsorption quantity of CO, which improved the conversion of CO at low temperature. More importantly, the SiO 2 weakened the surface basicity over the Ni-ZrO 2 catalyst, and thus decreased the strength and quantity of CO 2 adsorption, which greatly inhibited the methanation of CO 2 , leading to the higher selectivity for CO methanation. However, the strength of CO adsorption was found to be more related to the methanation of CO, which would be weakened by SiO 2 in the catalysts. Meanwhile, the SiO 2 increased the strength of H 2 adsorption over Ni surface. Therefore, excess SiO 2 added into Ni-ZrO 2 enhanced the competitive adsorption between CO and H 2 molecules over Ni surface, which weakened CO adsorption, resulting in the increase of CO outlet concentration.

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Selective CO methanation in H2-rich stream over Ni–, Co– and Fe/CeO2: Effect of metal and precursor nature

Cited by 50 publications

References 22 publications

Preferential Methanation of CO using Halogen‐Doped (F, Cl, Br) Ceria‐Supported Nickel Catalysts

Preferential Methanation of CO using Halogen‐Doped (F, Cl, Br) Ceria‐Supported Nickel Catalysts

Water–Gas Shift Reaction over Ni/CeO2 Catalysts

Effect of SiO₂ on the CO Selective Methanation over SiO₂/Ni‐ZrO₂ Catalysts

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Selective CO methanation in H2-rich stream over Ni–, Co– and Fe/CeO2: Effect of metal and precursor nature

Cited by 50 publications

References 22 publications

Preferential Methanation of CO using Halogen‐Doped (F, Cl, Br) Ceria‐Supported Nickel Catalysts

Preferential Methanation of CO using Halogen‐Doped (F, Cl, Br) Ceria‐Supported Nickel Catalysts

Water–Gas Shift Reaction over Ni/CeO2 Catalysts

Effect of SiO2 on the CO Selective Methanation over SiO2/Ni‐ZrO2 Catalysts

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Effect of SiO₂ on the CO Selective Methanation over SiO₂/Ni‐ZrO₂ Catalysts