Low-Temperature Methane Activation under Nonoxidative Conditions over Supported Ruthenium–Cobalt Bimetallic Catalysts

Guczi, L.; Sarma, K.V.; Borkó, L.

doi:10.1006/jcat.1997.1605

Cited by 33 publications

(8 citation statements)

References 36 publications

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“…The two-step route is also feasible over a number of oxide-or zeolite-supported transition metal and bimetal catalysts [16][17][18][19]. Solymosi and Cserenyi illustrated that over a Cu-promoted Rh/SiO 2 catalyst, the enhanced formation of C 2 H 6 and higher hydrocarbons could be observed in the twostep process [17].…”

Section: Direct Conversion Of Ch 4 Under Nonoxidative Conditions: a Bmentioning

confidence: 99%

“…Guczi et al found that there was a correlation between the hydrogen content of the surface CH x species (the optimum value of x being around 2) and the chain length of the hydrocarbons produced in the hydrogenation step in their mechanistic study of the two-step process [18]. Recently, they reported that the two-step process could be simplified into a one-step process with a C 2+ hydrocarbons production higher than that obtained in the two-step process over PtCo/NaY bimetallic catalyst.…”

Section: Direct Conversion Of Ch 4 Under Nonoxidative Conditions: a Bmentioning

confidence: 99%

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Direct conversion of methane under nonoxidative conditions

Bao

Lin

2003

Journal of Catalysis

295

184

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Section: Direct Conversion Of Ch 4 Under Nonoxidative Conditions: a Bmentioning

confidence: 99%

Section: Direct Conversion Of Ch 4 Under Nonoxidative Conditions: a Bmentioning

confidence: 99%

Direct conversion of methane under nonoxidative conditions

Bao

Lin

2003

Journal of Catalysis

295

184

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“…Guczi et al present a low-temperature methane activation under nonoxidative conditions over supported Ru−Co bimetallic system. A method of deuterium uptake by the surface CH x species formed after CH 4 dissociation is used to determine the H content in adsorbed CH x species.…”

Section: Introductionmentioning

confidence: 99%

A DFT Study of CH_x Chemisorption and Transition States for C−H Activation on the Ru(112̄0) Surface

Ciobica

Santen

2002

J. Phys. Chem. B

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The thermodynamics of methane decomposition on the ruthenium (1120) surface has been investigated with ab initio periodic calculations. All surface intermediates are more stable than the gas-phase methane even if the last step of the decomposition path: CH f C + H, is highly endothermic. Among all of the surface species, CH 2 appears to be the most stable. All of the surface species (CH x , x ) 3-1 and H) adsorb on bridge-up sites, while atomic C prefers top-down sites. The transition states of the elementary reactions for the dissociation of methane on the ruthenium (112 h0) surface have been investigated with nudged elastic band method (NEB). The calculated barriers are 56 kJ mol -1 for methane decomposition, 11 kJ mol -1 for methyl decomposition, and 52 kJ mol -1 for methylene decomposition, respectively. The decomposition of CH ads requires the highest activation energy from the series with 95 kJ mol -1 .

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“…In our earlier works [15][16][17][18][19][20][21] the advantages of the bimetallic Co-based catalysts compared with the monometallic ones in the NOCM process were demonstrated: Pt-Co > Pd-Co > Ru-Co > Re-Co > Co. To optimize the NOCM it is necessary to obtain detailed knowledge on the mechanism of the gas phase and surface chemistry. Although NOCM occurs on numerous monometallic catalysts (like Co, Ru), our earlier works shows the advantages of the cobalt-based bimetallic catalysts as compared with the monometallic ones.…”

Section: Introductionmentioning

confidence: 99%

Non-oxidative methane transformations into higher hydrocarbons over bimetallic Pt–Co catalysts supported on Al2O3 and NaY

Borkó

Guczi

2006

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The methane conversion under non-oxidative conditions over Al 2 O 3 and NaY supported cobalt, platinum and Pt-Co bimetallic catalysts in a flow system has been investigated. The two-step process was applied in the temperature range between 523 and 673 K and 1 bar pressure and the one-step process was carried out under the conditions of 1073 K and 10 bar pressure. Addition of platinum to NaY and alumina supported cobalt samples results in the formation of metallic Co particles and Pt-Co bimetallic particles. On bimetallic catalysts in the two-step process, the amount of C 2+ products formed were higher than that on monometallic samples. The synergism shown by the bimetallic system can be explained by: (i) enhanced reducibility of cobalt, and (ii) the co-operation of two types of active components (Co facilitates the chain-growth of partially dehydrogenated species produced on Pt in Pt-Co bimetallic particles). The use of higher pressures and high temperature makes it possible to run the process to form primarily ethane (and ethylene) which is predicted from thermodynamic calculations. For NaY as support, significantly enhanced activity and C 2+ selectivity are obtained compared with Al 2 O 3 as support, which can be attributed to the structural differences of metal particles (location, dispersion and reducibility).

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Low-Temperature Methane Activation under Nonoxidative Conditions over Supported Ruthenium–Cobalt Bimetallic Catalysts

Cited by 33 publications

References 36 publications

Direct conversion of methane under nonoxidative conditions

Direct conversion of methane under nonoxidative conditions

A DFT Study of CH_x Chemisorption and Transition States for C−H Activation on the Ru(112̄0) Surface

Non-oxidative methane transformations into higher hydrocarbons over bimetallic Pt–Co catalysts supported on Al2O3 and NaY

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Low-Temperature Methane Activation under Nonoxidative Conditions over Supported Ruthenium–Cobalt Bimetallic Catalysts

Cited by 33 publications

References 36 publications

Direct conversion of methane under nonoxidative conditions

Direct conversion of methane under nonoxidative conditions

A DFT Study of CHx Chemisorption and Transition States for C−H Activation on the Ru(112̄0) Surface

Non-oxidative methane transformations into higher hydrocarbons over bimetallic Pt–Co catalysts supported on Al2O3 and NaY

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A DFT Study of CH_x Chemisorption and Transition States for C−H Activation on the Ru(112̄0) Surface