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De–NO x conversion of selective catalytic reduction system for diesel engine using dual catalyst coated ceramic monoliths

  • Devakaran Karaiellapalayam Palanisamy EMAIL logo and Arunshankar Jayabalan
Published/Copyright: May 9, 2023
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International Journal of Chemical Reactor Engineering
From the journal International Journal of Chemical Reactor Engineering Volume 21 Issue 9

Abstract

Selective Catalytic Reduction (SCR) is a well-known method for reducing Oxides of Nitrogen (NO x ) emissions from the exhaust manifold of the engine. Retrofitting SCR system to the diesel engines and, enhancing the catalyst activity along with injection controller of this system has become necessary because of stringent emission standards. In this work, dual catalyst is used to increase catalytic activity and, controlled urea injection is applied to decrease the slip of SCR system for stationary diesel engine. First, a pair of ceramic monolith substrate is selected and, coated with cerium oxide and Cu–zeolite for oxidation and SCR catalyst, respectively. XRD, BET and TGA–DSC are used to analyze the structural, and electrochemical behavior of the synthesized catalyst. The morphology and element composition of dual catalyst coated over the substrates are studied using FE-SEM and XEDS. Second, the thermocouple and rotary encoder are used to control the injector of SCR system, which injects the urea when the burned NO x leaves the engine exhaust manifold and enters the SCR. Finally, the diesel engine performance indicators and emission reduction due to the SCR system are evaluated under Non Road Steady Cycle (NRSC). From the experimental results, it is observed that the combined action of catalyst provides wide operating range between 153 and 425 °C and, controlled urea injection at 220° of exhaust valve opening with rate of 24.44 ms per cycle achieved a high De–NO x conversion efficiency of 93.4 % for SCR system, with a marginal reduction in engine Brake Thermal Efficiency (BTE) at maximum Brake Power (BP) condition. Thus, diesel engine exhaust retrofitted with SCR system proposed in this work will meet the Euro-VI emission standards.

Keywords: ceramic monolith; diesel engine; dual catalyst; NO x ; SCR
Corresponding author: Devakaran Karaiellapalayam Palanisamy, Department of Automobile Engineering, PSG College of Technology, Coimbatore, India, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Abbreviations

SCR

Selective Catalytic Reduction

NO x

Nitrogen Oxide

NRSC

Non Road Steady Cycle

BTE

Brake Thermal Efficiency

PM

Particulate Matter

BP

Brake Power

IC

Internal Combustion

HC

Hydrocarbon

CO

Carbon Monoxide

PM

Particulate Matter

V2O5

Vanadium pentoxides

DOC

Diesel Oxidation Catalyst

DPF

Diesel Particulate Filter

XRD

X-ray Energy Dispersive Spectroscopy

TGA

Thermo Gravimetric Analysis

DSC

Differential Scanning Calorimetry

BET

Brunauer Emmett Teller

DFT

Density Functional Theory

FE-SEM

Field Emission Scanning Electron Microscope

XEDS

X-ray Energy Dispersive Spectroscopy

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Received: 2023-02-02
Accepted: 2023-04-22
Published Online: 2023-05-09

© 2023 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/ijcre-2023-0027
Keywords for this article
ceramic monolith; diesel engine; dual catalyst; NO x; SCR

Articles in the same Issue

  1. Frontmatter
  2. Articles
  3. Eco friendly synthesis of epoxidized palm oleic acid in acidic ion exchange resin
  4. Two-stage adsorber design for malachite green and methylene blue removal using adsorbents derived from banana peel
  5. Modeling and simulation of trickle bed reactors for the purification of 1-butene
  6. Smith-predictor based enhanced Dual-DOF fractional order control for integrating type CSTRs
  7. Enhancement investigation of mass transfer and mixing performance in the static mixers with three twisted leaves
  8. The influence of the configurations of multiple-impeller on canrenone bioconversion using resting cells of Aspergillus ochraceus
  9. De–NO x conversion of selective catalytic reduction system for diesel engine using dual catalyst coated ceramic monoliths
  10. Experimental study on coal-fired flue gas HCl removal by injecting adsorbent into flue duct
  11. Ferrous and manganese oxalate for efficient heterogenous-Fenton degradation of organic pollutants: composite active site and mechanism perception
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