Combining nonthermal plasma with perovskite-like catalyst for NO sub(x) storage and reduction

A new NO sub(x) storage and reduction (NSR) system is developed for NO sub(x) removal by combining perovskite-like catalyst with nonthermal plasma technology. In this hybrid system, catalyst is mainly used for oxidizing NO to NO sub(2) and storing them, while nonthermal plasma is applied as a desorp...

Full description

Saved in:
Bibliographic Details
Published in:Environmental science and pollution research international 2016-10, Vol.23 (19), p.19590-19601
Main Authors: Peng, Han Hsuan, Pan, Kuan Lun, Yu, Sheng Jen, Yan, Shaw Yi, Chang, Moo Been
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A new NO sub(x) storage and reduction (NSR) system is developed for NO sub(x) removal by combining perovskite-like catalyst with nonthermal plasma technology. In this hybrid system, catalyst is mainly used for oxidizing NO to NO sub(2) and storing them, while nonthermal plasma is applied as a desorption-reduction step for converting NO sub(x) into N sub(2). An innovative catalyst with a high NO sub(x) storage capacity and good reduction performance is developed by successive impregnation. The catalysts prepared with various metal oxides were investigated for NO sub(x) storage capacity (NSC) and NO sub(x) conversion. Characterization of the catalysts prepared reveals that addition of cobalt (Co) and potassium (K) considerably increases the performance for NSC. Results also show that SrKMn sub(0.8)Co sub(0.2)O sub(4) supported on BaO/Al sub(2)O sub(3) has good NSC (209 mu mol/g sub(catalyst)) for the gas stream containing 500 ppm NO and 5 % O sub(2) with N sub(2) as carrier gas. For plasma reduction process, NO sub(x) conversion achieved with SrKMn sub(0.8)Co sub(0.2)O sub(4)/BaO/Al sub(2)O sub(3) reaches 81 % with the applied voltage of 12 kV and frequency of 6 kHz in the absence of reducing agents. The results indicate that performance of plasma reduction process (81 %) is better than that of thermal reduction (64 %). Additionally, mixed gases including 1 % CO, 1 % H sub(2) and 1 % CH sub(4), and 2 % H sub(2)O sub((g)) are simultaneously introduced into the system to investigate the effect on NSR with plasma system and results indicate that performance of NSR with plasma can be enhanced. Overall, the hybrid system is promising to be applied for removing NO sub(x) from gas streams. [Figure not available: see fulltext.]
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-016-7114-2