Abstract
This research work aims to study the performance of biochar-supported manganese-based catalysts for conversion of NOx in the selective catalytic reduction (SCR) process. Biochar, a high energy density solid generated from biomass pyrolysis, usually is combusted to provide extra heat to the pyrolysis process. Compared to other carbonaceous materials, biochar has a larger surface area, large surface functional groups and is more economically advantageous. An experimental and observational methodology was adopted in which biochar with activation temperatures of 500 °C, 600 °C, and 700 °C were used as additional catalytic support to the Manganese-based SCR catalyst. The prepared samples were analyzed by various techniques like X-ray diffraction, Scanning electron microscopy, X-ray photoelectron spectroscopy, NH3-Temperature-programmed desorption and H2-Temperature programmed reduction to study various parameters like crystallographic structure and crystal properties, chemical states and elemental composition, surface acidity, and reducibility of the catalyst. Upon adding biochar, it was observed that the pore volume increased by 150% and the surface area by 114%. Subsequently, catalytic activity tests were conducted on the effect of biochar on NOx removal, SO2, and H2O tolerance, and the optimum catalyst composition were found. Catalytic performance increases with the addition of biochar over all temperature ranges, with Mn/TiO2-Char700 reaching a maximum NOx conversion rate of 90%, indicating that biochar is a viable alternative to existing catalytic supports.
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Abbreviations
- Al2O3 :
-
Aluminium oxide
- BET:
-
Brunauer–Emmett–teller
- CO2 :
-
Carbon-dioxide
- CrOx :
-
Chromium oxide
- Cu:
-
Copper
- eV:
-
Electron volt
- FeOx :
-
Iron oxide
- H2 :
-
Hydrogen gas
- Mn:
-
Manganese
- MnOx:
-
Manganese oxide
- MoO3 :
-
Molybdenum trioxide
- N2 :
-
Nitrogen gas
- N2O:
-
Nitrous oxide
- NaY:
-
Sodium yttrium
- NH3 :
-
Ammonia
- NH4 + :
-
Ammonium ion
- NO:
-
Nitric oxide
- Oα :
-
Lattice oxygen
- Oβ :
-
Chemisorbed oxygen
- SCR:
-
Selective catalytic reduction
- SEM:
-
Scanning electron microscope
- SO2 :
-
Sulphur dioxide
- TiO2 :
-
Titanium dioxide
- TPD:
-
Temperature programmed desorption
- TPR:
-
Temperature programmed reduction
- V2O5 :
-
Vanadium pentoxide
- VOx :
-
Vanadium oxide
- WO3 :
-
Tungsten trioxide
- XPS:
-
X-ray photoelectron spectroscopy
- XRD:
-
X-ray diffraction
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Raja, S., Eshwar, D., Natarajan, S. et al. Biochar supported manganese based catalyst for low-temperature selective catalytic reduction of nitric oxide. Clean Techn Environ Policy 25, 1109–1118 (2023). https://doi.org/10.1007/s10098-022-02274-5
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DOI: https://doi.org/10.1007/s10098-022-02274-5