Selective catalytic reduction of NO by Co-Mn based nanocatalysts

One of the most significant aspects in selective catalytic reduction (SCR) of nitrogen oxides (NOx) is developing suitable catalysts by which the process occurs in a favorable way. At the present work SCR reaction by ammonia (NH3-SCR) was conducted using Co-Mn spinel and its composite with Fe-Mn spinel, as nanocatalysts. The nanocatalysts were fabricated through liquid routes and then their physicochemical properties such as phase composition, degree of agglomeration, particle size distribution, specific surface area and also surface acidic sites have been investigated by X-ray diffraction, Field Emission Scanning Electron Microscope, Energy-dispersive X-ray spectroscopy, energy dispersive spectroscopy mapping, Brunauer-Emmett-Teller, temperature-programmed reduction (H-2-TPR) and temperature-programmed desorption of ammonia (NH3-TPD) analysis techniques. The catalytic activity tests in a temperature window of 150-400 degrees C and gas hourly space velocities of 10,000, 18,000 and 30,000 h(-1) revealed that almost in all studied conditions, CoMn2O4/FeMn2O4 nanocomposite exhibited better performance in SCR reaction than CoMn2O4 spinel.

Automated summary

The study focused on the ammonia SCR reaction using Co-Mn spinel and its composite with Fe-Mn spinel as nanocatalysts, revealing that the nanocomposite exhibited better performance than the spinel in almost all conditions tested. Physicochemical properties of the nanocatalysts were analyzed using various techniques, highlighting the importance of catalyst development for favorable SCR processes.