Kinetic Modelling of the Partial Oxidation of Methane to Syn-Gas at High Temperatures

Smet, C.R.H. de; Berger, Rob J.; Slaa, J.C.; Marin, Guy

doi:10.1016/s0167-2991(98)80534-x

Cited by 6 publications

(8 citation statements)

References 3 publications

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“…Foam monoliths have also been implicated in quenching active radical species from the gas phase in other studies with similar systems. 35,36 The primary role of the mnonolith appears to depend upon the primary pyrolysis pathway of the fuel. Because conversion is in general affected by the monoliths but not as much as by the addition of O 2 (a radical source), it appears that, for some fuels, the heat-transfer effect of the monoliths is more important than the radical-quenching effect.…”

Section: Articlementioning

confidence: 99%

Effect of Functional Groups on Autothermal Partial Oxidation of Bio-oil. Part 2: Role of Homogeneous and Support-Mediated Reactions

et al. 2011

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This work aims to clarify preferred chemical routes in an autothermal system by investigating individually two-carbon molecules containing the functional groups found in bio-oil. In part 2, conversion and selectivity to major compounds are compared in the presence and absence of R-Al 2 O 3 support and oxygen. Oxygen significantly increases conversion, even at feed rates insufficient to sustain autothermal operation. In general, below 450 °C, homogeneous reactions in the absence of oxygen are insignificant for all molecules; in the presence of oxygen, the reaction onset temperature is somewhat lower. The role of the R-Al 2 O 3 support appears to be a combination of improved heat transfer and the radical quenching ability of the foam structure. Acid catalysis appears minor compared to these other functions. With no O 2 co-feed, acids, ethers, and aldehydes appear to be more stable than alcohols and esters. With O 2 co-feed, acids and ethers may be less reactive in the gas phase than the other functionalities studied. Implications for autothermal systems are discussed.

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Section: Articlementioning

confidence: 99%

Effect of Functional Groups on Autothermal Partial Oxidation of Bio-oil. Part 2: Role of Homogeneous and Support-Mediated Reactions

et al. 2011

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“…Partial oxidation (POX) is considered more economical than the two processes (SRM and DRM) mentioned above, because it is an exothermic reaction. The industrial operating conditions of partial oxidation of methane to syngas are at temperatures higher than 920 • C and pressures above 800 kPa [40]. This reaction produces syngas with a ratio of H 2 :CO of 2:1 [14,41], as shown below (Equation ( 8)).…”

Section: Partial Oxidationmentioning

confidence: 99%

“…Steam reforming (SRM) is the most commonly used process, as it produces syngas with a high H 2 :CO ratio (3:1) that can be used to synthesize value-added chemicals, such as methanol and ammonia [9,40]. However, this reforming process produces CO 2 with syngas, which increases the purification issue.…”

Section: Critical Comparison Of the Different Reforming Technologiesmentioning

confidence: 99%

A Review on the Different Aspects and Challenges of the Dry Reforming of Methane (DRM) Reaction

Hussien

Polychronopoulou

2022

Nanomaterials

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The dry reforming of methane (DRM) reaction is among the most popular catalytic reactions for the production of syngas (H2/CO) with a H2:CO ratio favorable for the Fischer–Tropsch reaction; this makes the DRM reaction important from an industrial perspective, as unlimited possibilities for production of valuable products are presented by the FT process. At the same time, simultaneously tackling two major contributors to the greenhouse effect (CH4 and CO2) is an additional contribution of the DRM reaction. The main players in the DRM arena—Ni-supported catalysts—suffer from both coking and sintering, while the activation of the two reactants (CO2 and CH4) through different approaches merits further exploration, opening new pathways for innovation. In this review, different families of materials are explored and discussed, ranging from metal-supported catalysts, to layered materials, to organic frameworks. DRM catalyst design criteria—such as support basicity and surface area, bimetallic active sites and promoters, and metal–support interaction—are all discussed. To evaluate the reactivity of the surface and understand the energetics of the process, density-functional theory calculations are used as a unique tool.

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“…In fact, high reaction temperatures above 750 • C are normally required for such complete conversion of methane to carbon dioxide and water [9,10]. Consequently, we can modify the relevant reactions to those at 1000 K [11…”

Section: Background and Objectivesmentioning

confidence: 99%

“…In Refs. [9][10][11], the water is commonly listed as a liquid for a temperature of around 300 K and as a gas for a temperature of around 1000 K. We hope that these listed details along with specific heats for exothermic or endothermic reactions at two different temperatures will provide our readers with a more complete view of both complete and incomplete methane combustion. Furthermore, as depicted in Equation (1), when the proportionality of methane (gas) and oxygen (air) is not ideal, more importantly, the vapor content within the air, measured by relative humidity or absolute humidity, the air and gas mixture does not yield a complete combustion, and instead an incomplete combustion reaction of gas and air is produced.…”

Section: Background and Objectivesmentioning

confidence: 99%

Modeling of a Blast Furnace with Both CFD and Thermodynamics Principles

Wang

Grejtak²

2022

Applied Mechanics

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In this paper, we revisit a turbulent mixing of gas and air in a gas burner with computational fluid dynamics (CFD) models. The quality of such a turbulent mixture is based on temperature, pressure, and velocity distributions as well as the distributions of different molecules, turbulent kinetic energy, and turbulent dissipation rate. In order to identify a precise combination of a gas and air mixture in a gas burner, which directly influences the quality of the combustion flame and reduces the amount of carbon monoxide (CO) emission in flue gases, thermodynamic principles are utilized based on the balancing ratio of molecular weights and the balancing ratio of mass flows between gas and air. Moreover, input parameters, such as volume flow rates, pressure, mass ratio, temperature, turbulent kinetic energy, and turbulent dissipation rate, are judiciously chosen with proper boundary conditions for both axisymmetric two-dimensional and three-dimensional models. It is confirmed that the effectiveness of gas and air mixture and combustion depends on the gas burner model, more specifically, on the sizes and locations of gas and air inlets and outlets as well as operation conditions.

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Kinetic Modelling of the Partial Oxidation of Methane to Syn-Gas at High Temperatures

Cited by 6 publications

References 3 publications

Effect of Functional Groups on Autothermal Partial Oxidation of Bio-oil. Part 2: Role of Homogeneous and Support-Mediated Reactions

Effect of Functional Groups on Autothermal Partial Oxidation of Bio-oil. Part 2: Role of Homogeneous and Support-Mediated Reactions

A Review on the Different Aspects and Challenges of the Dry Reforming of Methane (DRM) Reaction

Modeling of a Blast Furnace with Both CFD and Thermodynamics Principles

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