Development and Application of La0.8Sr0.2MnO3/MgAl2O4 Wire-mesh Honeycomb Catalyst for Catalytic Combustion of Air Diluted Methane

The composite powders of La0.8Sr0.2MnO3 (LSM) perovskite and MgAl2O4 (MA) spinel, named as LSMn were prepared by deposition-precipitation method. The factors affecting preparation conditions, such as molar ratio of MA to LSM (n), aging temperature and calcination temperature of precursors were investigated. The activity of LSMn samples for the catalytic combustion of air diluted methane was evaluated in a temperature-programmed micro reactor. The properties of catalysts were characterized by FTIR, H2-TPR, BET, XRD and SEM. The results showed that when precursor was aged at 10℃ and calcined at 800℃, the resulting LSM4 sample demonstrated the best activity (T50=489.4℃; Ea=112.5 kJ/mol) and exhibited excellent sintering resistance with a specific surface area of 81.6 m2/g. The second carrier MA and LSM4 powders were then coated on Fe-Cr-Al wire mesh by dip-coating method to prepare wire mesh honeycomb catalysts. The effects of MA loading and LSM4 coating on the catalytic combustion of 0.5% methane were investigated at GHSV of 40000 h-1, respectively. The results revealed that the proper coating thickness of MA was around 20 μm, and the best loading of LSM4 was about 2.65 mg/cm2. The methane conversion over this wire mesh honeycomb catalyst was above 30%. © 2019, Editorial Office of FINE CHEMICALS. All right reserved.