Simultaneous Control of NOx-Soot by Substitutions of Ag and K on Perovskite (LaMnO3) Catalyst

DOI: https://doi.org/10.9767/bcrec.13.1.1152.144-154
Copyright (c) 2018 Bulletin of Chemical Reaction Engineering & Catalysis
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Submitted: 13-04-2017
Published: 02-04-2018
Section: Original Research Articles
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The different Ag and K substituted perovskite catalysts including base catalyst were LaMnO3 by the solid state method and the diesel soot was prepared in the laboratory. Their structures and physico-chemical properties were characterized by X-ray diffraction (XRD), BET, SEM, H2-TPR, and XPS techniques. The Ag Substituted at A-site perovskite structured catalysts are more active than other type of catalysts for the simultaneous soot-NOX reaction, When Ag and K are simultaneously introduced into LaMnO3 catalyst, soot combustion is largely accelerated, with the temperature (Tm) for maximal soot conversion lowered by at least 50 °C, moreover, NOX reduction by soot is also facilitated. The high activity of La0.65Ag0.35MnO3 perovskite catalyst is attributed to presence of metallic silver in the catalyst. The activity order of Ag doped LaMnO3 is as follows La0.65Ag0.35MnO3 > La0.65Ag0.2MnO3 > La0.65Ag0.4MnO3 > La0.65Ag0.1MnO3. The dual substitution of silver and potassium in place of La in LaMnO3 gives better activity than only silver doped catalyst. In a series of La0.65AgxK1-xMnO3, the optimum substitution amount of K is for x=0.25. The single and doubled substituted perovskite catalyst proved to be effective in the simultaneous removal of NOX and soot particulate, the two prevalent pollutants in diesel exhaust gases in the temperature range 350-480 °C. Copyright © 2018 BCREC Group. All rights reserved

Received: 19th July 2017; Revised: 8th September 2017; Accepted: 8th September 2017; Available online: 22nd January 2018; Published regularly: 2nd April 2018

How to Cite: Dhal, G.C., Dey, S., Mohan, D., Prasad, R. (2018). Simultaneous Control of NOx-Soot by Substitutions of Ag and K on Perovskite (LaMnO3) Catalyst. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (1): 144-154 (doi:10.9767/bcrec.13.1.1152.144-154)

Keywords

Perovskite catalysts; Simultaneous removal of NOX and diesel soot; solid state method.

  1. Ganesh Chandra Dhal 
    Department of Civil Engineering, IIT (BHU) Varanasi, Uttar Pradesh, India
    Ph.D. Student, Working in the Area Air Pollution Control,  Department of Civil Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, India
  2. Subhashish Dey 
    Department of Civil Engineering, IIT (BHU) Varanasi, Uttar Pradesh, India
    Ph.D. Student, Working in the Area Air Pollution Control,  Department of Civil Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, India
  3. Devendra Mohan 
    Department of Civil Engineering, IIT (BHU) Varanasi, Uttar Pradesh, India
    Professor, Working in the Area Air Pollution Control and Catalysis,  Department of Civil Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, India
  4. Ram Prasad 
    Department of Chemical Engineering and Technology, IIT (BHU) Varanasi, Uttar Pradesh, India
    Professor, Working in the Area Air Pollution Control and Catalysis,  Department of Civil Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, India
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