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Biochar supported manganese based catalyst for low-temperature selective catalytic reduction of nitric oxide

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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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Correspondence to S. Raja.

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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

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