[Oral Presentation]Effect of calcination temperature on Fe2O3/Al2O3 porous media catalysts for catalytic low-concentration methane combustion in a graduated porous burner

Effect of calcination temperature on Fe2O3/Al2O3 porous media catalysts for catalytic low-concentration methane combustion in a graduated porous burner

ID：356 View Protection：ATTENDEE Updated Time：2024-05-15 19:36:51 Hits：516 Oral Presentation

Start Time：2024-05-31 14:40 （Asia/Shanghai）

Duration：20min

Session：[S5] Smart Energy and Clean Power Technology » [S5-2] Afternoon of May 31st

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Abstract

The treatment of low-concentration methane (LCM) from coal mining is a formidable challenge for achieving near-zero emissions in the coal mining process. Porous media catalytic combustion (PMCC) is believed to be a practicable strategy for the disposal of LCM. However, the exploitation of PM catalyts is critical to the efficient operation of the technology. Herein, the Fe2O3/Al2O3 PM catalysts were fabricated by ultrasound-assisted impregnation at calcination temperatures of 650 °C, 700 °C, 750 °C, and 800 °C for LCM catalytic combustion in a four-layer gradually varied porous burner. The effect of calcination temperature on catalyst reactivity was investigated by characterization analysis and catalytic combustion experiments. The catalytic combustion properties were evaluated at different equivalence ratios (0.35 ~ 0.45) and flow rates (50 ~ 80 L/min). The results indicated that the Fe2O3/Al2O3 calcinated at 700 ℃ (Fe2O3/Al2O3-700) exhibited ascendant catalytic activity and stability with superior physical and chemical properties. Higher calcination temperatures were inimical to the structural stability and the ameliorated reactivity of the catalyst due to the destruction of the positive interaction between Fe2O3 and Al2O3 support. The highest internal and interfacial preheating temperatures (245 ℃ and 321 ℃) in the catalyst facilitated the combustion efficiency of LCM under lean combustion conditions reaching 100 % CH4 conversion with minimal CO (289.42 ppm) and NOx (2.70 ppm) emissions. The reliable flame migration in Fe2O3/Al2O3-700 improved the combustion flame anchoring and stability, and LCM achieved stationary combustion for more than 140 min at φ = 0.40 and a flow rate of 50 L/min with the temperature consistently maintained at about 257 °C.

Keywords

low-concentration methane, porous media, Fe2O3/Al2O3, catalytic combustion, calcination temperature

Speaker

Yifan Ding

China University of Mining and Technology