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Journal of Chemistry
Volume 2017, Article ID 9340856, 10 pages
https://doi.org/10.1155/2017/9340856
Research Article

NOx Removal from Simulated Marine Exhaust Gas by Wet Scrubbing Using NaClO Solution

Marine Engineering College, Dalian Maritime University, Dalian 116026, China

Correspondence should be addressed to Zhitao Han; nc.ude.umld@tznah

Received 31 December 2016; Revised 25 May 2017; Accepted 15 June 2017; Published 13 July 2017

Academic Editor: Andrea Gambaro

Copyright © 2017 Zhitao Han et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The experiments were performed in a lab-scale countercurrent spraying reactor to study the NOx removal from simulated gas stream by cyclic scrubbing using NaClO solution. The effects of NaClO concentration, initial solution pH, coexisting gases (5% CO2 and 13% O2), NOx concentration, SO2 concentration, and absorbent temperature on NOx removal efficiency were investigated in regard to marine exhaust gas. When NaClO concentration was higher than 0.05 M and initial solution pH was below 8, NOx removal efficiency was relatively stable and it was higher than 60%. The coexisting CO2 (5%) had little effect on NOx removal efficiency, but the outlet CO2 concentration decreased slowly with the initial pH increasing from 6 to 8. A complete removal of SO2 and NO could be achieved simultaneously at 293 K, initial pH of 6, and NaClO concentration of 0.05 M, while the outlet NO2 concentration increased slightly with the increase of inlet SO2 concentration. NOx removal efficiency increased slightly with the increase of absorbent temperature. The relevant reaction mechanisms for the oxidation and absorption of NO with NaClO were also discussed. The results indicated that it was of great potential for NOx removal from marine exhaust gas by wet scrubbing using NaClO solution.