Kinetics of the Methanation of Carbon Dioxide over Ruthenium on Titania

Traa, Yvonne; Weitkamp, Jens

doi:10.1002/(sici)1521-4125(199904)22:4<291::aid-ceat291>3.0.co;2-l

Cited by 25 publications

(16 citation statements)

References 6 publications

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“…TiO 2 , SiO 2 , Al 2 O 3 , CeO 2 , MgO and ZrO 2 ). [31][32][33][34][35][36][37][38][39][40] It is a highly exothermic process (H = -165 kJ/mol) and thus, 5 thermal conductive supports (carbon nanotubes, graphene, and silicon carbide just to mention a few) [41][42][43][44][45] are generally recommended in order to prevent as much as possible the generation of local temperature gradients (hot spots) inside the catalyst bed during the process. Indeed, the generation of "hot spots" inside the catalyst can be largely detrimental both in terms of catalyst life-time and performance of the methanation process.…”

Section: Introductionmentioning

confidence: 99%

CO2 methanation under dynamic operational mode using nickel nanoparticles decorated carbon felt (Ni/OCF) combined with inductive heating

Wang

Duong‐Viet

et al. 2020

Catalysis Today

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Highlights:1. Three-dimensional (3D) composites of tuneable shape and dimension have been straightforwardly prepared and applied as catalysts in the CO 2 methanation reaction.2. An inductive heating system has been firstly employed with success in such an exothermal process.3. Ni@OCF catalyst exhibits high catalytic activity and stability for CO 2 methanation already under moderate reaction conditions.

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Section: Introductionmentioning

confidence: 99%

CO2 methanation under dynamic operational mode using nickel nanoparticles decorated carbon felt (Ni/OCF) combined with inductive heating

Wang

Duong‐Viet

et al. 2020

Catalysis Today

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“…The CO 2 methanation reaction is an 8-electron process in which the fully oxidized carbon is reduced to its fully reduced form in methane, and there are significant kinetic barriers that require a catalyst to overcome in order to achieve acceptable rates and selectivities. Supported transition metal catalysts including Ni [5][6][7][8][9][10], Pd [11][12][13][14][15], Pt and Ir [12], Ru [12,[16][17][18][19][20][21][22][23][24][25][26][27][28], and Rh [12,[29][30][31][32][33][34] have been demonstrated to be active toward CO 2 methanation. However, key aspects regarding the mechanism of CO 2 methanation still remain elusive.…”

Section: Introductionmentioning

confidence: 99%

Kinetic modeling and transient DRIFTS–MS studies of CO2 methanation over Ru/Al2O3 catalysts

Wang

Yan

Shi

et al. 2016

Journal of Catalysis

219

143

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CO 2 methanation was investigated on 5% and 0.5% Ru/Al 2 O 3 catalysts (Ru dispersions: ~18% and ~40%, respectively) by steady-state kinetic measurements and transient DRIFTS-MS. Methanation rates were higher over 5% Ru/Al 2 O 3 than over 0.5% Ru/Al 2 O 3. The measured activation energies, however, were lower on 0.5% Ru/Al 2 O 3 than on 5% Ru/Al 2 O 3. Transient DRIFTS-MS results demonstrated that direct CO 2 dissociation was negligible over Ru. CO 2 has to first react with surface hydroxyls on Al 2 O 3 to form bicarbonates, which, in turn, react with adsorbed H on Ru to produce adsorbed formate species. Formates, most likely at the metal/oxide interface, can react rapidly with adsorbed H forming adsorbed CO, only a portion of which is reactive toward adsorbed H, ultimately leading to CH 4 formation. The unreactive CO molecules are in geminal form adsorbed on low-coordinated sites. The measured kinetics are fully consistent with a Langmuir-Hinshelwood type mechanism in which the H-assisted dissociation of the reactive CO* is the rate-determining step (RDS). The similar empirical rate expressions (4= 20.1 20.3−0.5) and DRIFTS-MS results on the two catalysts under both transient and steady-state conditions suggest that the mechanism for CO 2 methanation does not change with Ru particle size under the studied experimental conditions. Kinetic modeling results further indicate that the intrinsic activation barrier for the RDS is slightly lower on 0.5% Ru/Al 2 O 3 than on 5% Ru/Al 2 O 3. Due to the presence of unreactive adsorbed CO on lowcoordinated Ru sites under reaction conditions, the larger fraction of such surface sites on 0.5% Ru/Al 2 O 3 than on 5% Ru/Al 2 O 3 is regarded as the main reason for the lower rates for CO 2 methanation on 0.5% Ru/Al 2 O 3 .

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“…Particularly suitable for the methanation of carbon dioxide are Ru/TiO 2 catalysts. Such catalysts display their maximum activity at relatively low temperatures which is favorable with respect to the equilibrium conversion of the strongly exothermic reaction and form small amount of methane even at room temperature (Traa and Weitkamp, 1999). It can be prove by VanderWiel et al (2000) who had studied on the production of methane from CO 2 via Sabatier reaction.…”

Section: Noble Metals Used In Methanation Catalystsmentioning

confidence: 94%

Natural Gas

Bakar¹,

Ali²

2010

Natural Gas

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grouped in with other fossil fuels and sources of energy, there are many characteristics of natural gas that make it unique. Below is a bit of background information about natural gas, what exactly it is, how it is formed, and how it is found in nature 2.1 History of Natural Gas Naturally occurring natural gas was discovered and identified in America as early as 1626, when French explorers discovered natives igniting gases that were seeping into and around Lake Erie. The American natural gas industry got its beginnings in this area. In 1859, Colonel Edwin Drake (a former railroad conductor who adopted the title 'Colonel' to impress the townspeople) dug the first well. Drake hit oil and natural gas at 69 feet below the surface of the earth. Without any way to transport it effectively, natural gas discovered pre-world war II was usually just allowed to vent into the atmosphere, or burnt, when found alongside coal and oil, or simply left in the ground when found alone. One of the first lengthy pipelines was constructed in 1891. This pipeline was 120 miles long, and carried natural gas from wells in central Indiana to the city of Chicago. However, this early pipeline was very rudimentary, and did not transport natural gas efficiently. It wasn't until the 1920's that any significant effort was put into building a pipeline infrastructure. After World War II welding techniques, pipe rolling, and metallurgical advances allowed for the construction of reliable pipelines. This led to a postwar pipeline construction boom lasting well into the 60's, creating thousands of miles of pipeline in America. Once the transportation of natural gas was possible, new uses for natural gas were discovered. These included using natural gas to heat homes and operate appliances such as water heaters and oven ranges. Industry began to use natural gas in manufacturing and processing plants. Also, natural gas was used to heat boilers used to generate electricity. The transportation infrastructure made natural gas easier to obtain, and as a result expanded its uses. 2.2 How Natural Gas is Formed Millions of years ago, the remains of plants and animals decayed and built up in thick layers. This decayed matter from plants and animals is called organic material-a compound that capable of decay or sometime refers as a compound consists mainly carbon. Over time, www.intechopen.com Natural Gas 4 How to reference In order to correctly reference this scholarly work, feel free to copy and paste the following:

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Kinetics of the Methanation of Carbon Dioxide over Ruthenium on Titania

Cited by 25 publications

References 6 publications

CO2 methanation under dynamic operational mode using nickel nanoparticles decorated carbon felt (Ni/OCF) combined with inductive heating

CO2 methanation under dynamic operational mode using nickel nanoparticles decorated carbon felt (Ni/OCF) combined with inductive heating

Kinetic modeling and transient DRIFTS–MS studies of CO2 methanation over Ru/Al2O3 catalysts

Natural Gas

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