Mechanism of the Catalytic Hydrogenation of Oxides of Carbon to Methane

Vlasenko, V. M.; Yuzefovich, G E

doi:10.1070/rc1969v038n09abeh001829

Cited by 90 publications

(27 citation statements)

References 1 publication

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“…Fujita et al [71], Vlasenko et al [72] and Ibraeva et al [73] studied the mechanism of CO 2 methanation by kinetics in the transient state on a Ni catalyst. They considered that CO does not participate in the CO 2 methanation reaction.…”

Section: Introductionmentioning

confidence: 98%

Insights into the mechanisms of CO2 methanation on Ni(111) surfaces by density functional theory

Ren

Guo

Yang

et al. 2015

Applied Surface Science

170

128

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a b s t r a c tThe different mechanisms of CO 2 methanation on Ni(111) surfaces have been investigated by density functional theory with and without the formation of CO as an intermediate. The most stable adsorption configurations of all reaction species (O, OH, CO, CH, CH 2 , CH 3 , CH 4 , HCOO, C(OH) 2 , CH 2 O, etc.) in three paths of CO 2 methanation adsorbed on the Ni(111) surface are described. The energy barriers and reaction energies for the overall processes involved in the various paths are presented. The rate-determining steps for the three mechanisms are HCOO→CO + OH for path 1, CO → C + O for path 2 and CO 2 + 2H → C(OH) 2 for path 3 with maximum energy barriers of 306.8 kJ/mol, 237.4 kJ/mol and 292.3 kJ/mol, respectively. Path 2 is therefore the optimum of the three mechanisms. The path starts with CO 2 dissociation into CO and O, CO decomposition into C and O species and C species hydrogenation to form CH 4 : CO 2 → CO + O → C + O + 4H → CH 2 + 2H → CH 3 + H → CH 4 .

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Section: Introductionmentioning

confidence: 98%

Insights into the mechanisms of CO2 methanation on Ni(111) surfaces by density functional theory

Ren

Guo

Yang

et al. 2015

Applied Surface Science

170

128

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“…The rate equations proposed for this reaction on different nickel catalysts can be divided into zero order equations [1][2][3][4][5], power equations [5][6][7][8][9][10][11][12][13][14][15], and Langmuir-Hinshelwood equations [15][16][17][18][19][20][21][22][23][24][25]. In the power equations, the orders of reaction with respect to hydrogen and CO vary in the ranges from 0.5 to 1.8 and from -0.87 to 1.0, respectively.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of carbon monoxide methanation on nickel catalysts

et al. 2012

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The kinetics of CO methanation in excess H 2 on CaO and CeO 2 doped nickel catalysts sup ported on Al 2 O 3 and TiO 2 was studied at atmospheric pressure in a temperature range of 180-240°C. It was found that the same rational fractional rate equation corresponding to the reaction taking place at high sur face coverages, is valid for all of the catalysts. The activity of nickel catalysts in the methanation reaction and their adsorption capacity with respect to reaction mixture components depend on the nature of the support and dopants.

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“…Many reports discussed the inhibition of C02 methanation by CO (6,9,12,20,21,22,23). At 160°C and 300 psig, there is indication that as little as 65 ppm CO would stop C02 methanation (12).…”

Section: ° Equation Used To Derive Activitiesmentioning

confidence: 98%

Development of Methanation Catalysts for the Synthetic Natural Gas Processes

Hausberger¹,

Knight²,

Atwood³

1975

Methanation of Synthesis Gas

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It was shown in laboratory studies that methanation activity increases with increasing nickel content of the catalyst but decreases with increasing catalyst particle size. Increasing the steam-to-gas ratio of the feed gas results in increased carbon monoxide shift conversion but does not affect the rate of methanation. Trace impurities in the process gas such as H 2 S and HCl poison the catalyst. The poisoning mechanism differs because the sulfur remains on the catalyst while the chloride does not. Hydrocarbons at low concentrations do not affect methanation activity significantly, and they reform into methane; at higher levels, hydrocarbons inhibit methanation and can result in carbon deposition. A pore diffusion kinetic system was adopted which correlates the laboratory data and defines the rate of reaction.

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Mechanism of the Catalytic Hydrogenation of Oxides of Carbon to Methane

Cited by 90 publications

References 1 publication

Insights into the mechanisms of CO2 methanation on Ni(111) surfaces by density functional theory

Insights into the mechanisms of CO2 methanation on Ni(111) surfaces by density functional theory

Kinetics of carbon monoxide methanation on nickel catalysts

Development of Methanation Catalysts for the Synthetic Natural Gas Processes

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