Abstract
Natural gas (with methane as its main component) provides an attractive energy source because of its large abundance and its high heat of combustion per mole of carbon dioxide generated. However, the emissions released from the conventional flame combustion (essentially NOx) have harmful impacts on the environment and the human health. Within the scope of rational and clean use of fossil energies, the catalytic combustion of natural gas appears as one of the most promising alternatives to flammable combustion. The presence of catalysts enables complete oxidation of methane at much lower temperatures (typically 500 °C), so that the formation of pollutants can be largely avoided. This work presents a literature review on the catalytic methane combustion. Various aspects are discussed including the catalyst types, the reaction mechanisms and kinetic characteristics, effects of various influencing operational factors and different reactor types proposed and tested. This paper may serve as an essential reference that contributes to the development of well-designed reactors, equipped with appropriate catalysts, and under well-handled operating conditions to realize the favorable (kinetic) performance, for their future applications and propagation in different industrial sectors.
Highlights
One of the major concerns over economic growth and social devel opment nowadays is the constantly increasing energy demand [1]
This paper may serve as an essential reference that contributes to the development of well-designed reactors, equipped with appropriate cat alysts and under well-handled operating conditions, towards realizing their favorable performance and for their future application and propagation in different industrial sectors
The kinetic models of catalytic methane combustion (CMC) over Pt/Al2O3 catalyst proposed by Trimm and Lam [162] well fit the Langmuir-Hinselwood mechanism, indicating that both the adsorbed methane and oxygen were involved in the reaction
Summary
One of the major concerns over economic growth and social devel opment nowadays is the constantly increasing energy demand [1]. (3) Catalytic performances: methane combustion, methane partial oxidation, N2O decomposition Methane conversion in SOFCs: (1) Catalytic methane oxidation (2) Electrochemical conversion of methane (3) Major challenges for methane conversion on catalytic anodes Advanced reactor concepts for oxidative coupling of methane (1) Concept and type of reactors for methane oxidative coupling (2) Heat management system (3) Applications Nanostructured perovskite oxides (1) CMC reaction mechanism (2) Properties and structure design of perovskite (3) Recent advances of perovskite for CMC Various aspects on CMC (1) Catalysts: hexaaluminates, perovskite, noble metal (2) Reaction mechanism and kinetics (3) Reaction operational conditions: effect of temperature, ratio of oxygen to methane, space velocity, natural gas composition, pressure (4) Reactor types: fixed-bed reactor, wall-coated reactor (folded plate-type, tube-coated type, monolithic, microchannel plate-type), membrane bed, fluidized bed. This paper may serve as an essential reference that contributes to the development of well-designed reactors, equipped with appropriate cat alysts and under well-handled operating conditions, towards realizing their favorable (kinetic) performance and for their future application and propagation in different industrial sectors
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