Low Temperature Selective Catalytic Reduction (SCR) of NOx Emissions by Mn-doped Cu/Al2O3 Catalysts

DOI: https://doi.org/10.9767/bcrec.12.3.895.415-429
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Submitted: 05-01-2017
Published: 28-10-2017
Section: Original Research Articles
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The 15 mol% Cu/Al2O3 catalysts with different Mn doping (0.5, 1.0, 1.5, mol%) were prepared using PEG-300 surfactant following evaporation-induced self-assembly (EISA) method. Calcination of precursors were performed in flowing air conditions at 500 ºC. The catalysts were characterized by X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscope Energy Dispersive X-Ray (SEM-EDX), Fourier Transform Infra Red (FTIR), and N2 physisorption. The catalysts activities were evaluated for H2 assisted LPG-SCR of NO in a packed bed tubular flow reactor with 200 mg catalyst under the following conditions: 500 ppm NO, 8 % O2, 1000 ppm LPG, 1 % H2 in Ar with total flow rate of 100 mL/min. Characterization of the catalysts revealed that surface area of 45.6-50.3 m2/g, narrow pore size distribution (1-2 nm), nano-size crystallites, Cu2+ and Mn2+ phases were principal active components. Hydrogen enhanced significantly selective reduction of NO to N2 with LPG over 1.0 mol % Mn-Cu/Al2O3 giving 95.56 % NO reduction at 150 ºC. It was proposed that the synergistic interaction between H2 and LPG substantially widened the NO reduction temperature window and a considerable increase in both activity and selectivity. Negligible loss of catalyst activity was observed for the 50 h of stream on run experiment at 150 ºC. The narrow pore size distribution, thermal stability of the catalyst and optimum Mn doping ensures good dispersion of Cu and Mn over Al2O3 that improved NO reduction in H2-LPG SCR system. Copyright © 2017 BCREC Group. All rights reserved

Received: 5th January 2017; Revised: 20th May 2017; Accepted: 20th May 2017; Available online: 27th October 2017; Published regularly: December 2017

How to Cite: Yadav, D., Kavaiya, A.R., Mohan, D., Prasad, R. (2017). Low Temperature Selective Catalytic Reduction (SCR) of NOx Emissions by Mn-doped Cu/Al2O3 Catalysts. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (3): 415-429 (doi:10.9767/bcrec.12.3.895.415-429)

 

Keywords

Mn-doped Cu/Al2O3; Selective Catalytic Reduction; SCR; NOx; H2-LPG; de-NOx

  1. Deepak Yadav  Scholar
    Department of Chemical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221 005, India

    Ph.D. Scholar, Department of Chemical Engineering & Technology, Indian Institute of Technology (BHU) Varanasi

  2. Ashish R. Kavaiya  Scholar
    Department of Chemical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221 005, India
    PG Student, Department of Chemical Engineering & Technology, Indian Institute of Technology (BHU) Varanasi
  3. Devendra Mohan 
    Department of Civil Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221 005, India

    Professor, Department of Civil Engineering,

    Indian Institute of Technology (BHU) Varanasi, 221 005

  4. Ram Prasad 
    Department of Chemical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221 005, India

    Professor, Department of Chemical Engineering & Technology,

    Indian Institute of Technology (BHU) Varanasi, 221 005

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