NOx storage and reduction assisted by non-thermal plasma over Co/Pt/Ba/γ-Al2O3 catalyst using CH4 as reductant

• 作者: Tao ZHU Xing ZHANG Nengjing YI Haibing LIU Zhenguo LI
• 来源期刊: 等离子体科学和技术（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: PLASMA TECHNOLOGY
• 页码范围: 76-84
• 页数: 9页
• 语种: 英文

摘要

NOx storage and reduction(NSR)technology has been regarded as one of the most promising strategies for the removal of nitric oxides(NOx)from lean-burn engines,and the potential of the plasma catalysis method for NOx reduction has been confirmed in the past few decades.This work reports the NSR of nitric oxide(NO)by combining non-thermal plasma(NTP)and Co/Pt/Ba/γ-Al2O3(Co/PBA)catalyst using methane as a reductant.The experimental results reveal that the NOx conversion of NSR assisted by NTP is notably enhanced compared to the catalytic efficiency obtained from NSR in the range of 150 ℃-350 ℃,and NOx conversion of the 8％Co/PBA catalyst reaches 96.8％at 350℃.Oxygen(O2)has a significant effect on the removal of NOx,and the NOx conversion increases firstly and then decreases when the O2 concentration ranges from 2％to 10％.Water vapor reduces the NOx storage capacity of Co/PBA catalysts on account of the competition for adsorption sites on the surface of Co/PBA catalysts.There is a negative correlation between sulfur dioxide(SO2)and NOx conversion in the NTP system,and the 8％Co/PBA catalyst exhibits higher NOx conversion compared to other catalysts,which shows that Co has a certain SO2 resistance.