Synthesis and evaluation of Mn-Fe-Ce mixed oxide catalysts in lean methane combustion reactionon reaction

Ranjbar Fordoei, Atieh

Synthesis and evaluation of Mn-Fe-Ce mixed oxide catalysts in lean methane combustion reactionon reaction

Author

A. ranjbar fordoei

Department of Chemical Engineering, Tafresh University, Tafresh 39518 79611, Iran

Abstract

Research subject: Research subject: Incomplete combustion of methane in natural gas vehicles, gas turbines, and other sources releases environmental pollutants, including unburned methane. Thus, employment of processes that provide complete combustion of methane at low temperatures is necessary. Lean catalytic methane combustion is an efficient process for controlling environmental pollutants while utilizing methane as a fossil (or synthetic) fuel source. Despite extensive research, the development of catalysts with high activity, thermal stability, and low light-off temperature remains a significant challenge in this field.

Research approach: In this study, manganese-iron mixed oxide catalysts and Ce-promoted manganese-iron mixed oxide catalysts were evaluated for lean methane combustion under the following conditions: an oxygen-to-methane ratio of 6:1 and temperatures ranging from 200°C to 550°C in 50°C increments. The manganese-iron mixed oxide catalyst was synthesized using a surfactant-assisted co-precipitation technique, while the Ce-promoted manganese-iron mixed oxide catalyst was prepared via a wet impregnation method.

Main results: The Mn-Fe catalyst showed great catalytic activity in lean methane combustion. The temperatures corresponding to 10%, 50%, and 90% methane conversion (light-off temperatures) for the Mn-Fe catalyst were 305°C, 333°C, and 437°C, respectively. The high catalytic activity of the Mn-Fe catalyst was attributed to its high BET surface area (59.9 m2·g-1), the redox properties of the mixed oxide, and the oxygen storage capacity of manganese oxide. The Ce-promoted Mn-Fe catalysts exhibited relatively higher catalytic activity compared to the unpromoted catalyst in lean methane combustion. 90% methane conversion was achieved at 421°C (T90) for the promoted catalyst, while no significant changes were observed in the temperatures corresponding to 10% and 50% methane conversion. The addition of Ce as a promoter enhanced the catalyst's stability at 500°C after 5 hours on stream. The promoted catalyst exhibited no decrease in catalytic activity, whereas the unpromoted catalyst showed a decrease of less than 2% in catalytic activity.

Keywords

Methane Combustion

Manganese

Iron

Cerium

Catalyst

Subjects

nano-catalyst

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