|Table of Contents|

Advances in selective catalytic reduction and ammonia slipcatalyst for diesel fuelled vehicles(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年1期
Page:
97-114
Research Field:
汽车与机械工程
Publishing date:

Info

Title:
Advances in selective catalytic reduction and ammonia slipcatalyst for diesel fuelled vehicles
Author(s):
LI Songfeng;  ZHANG Chunhua;  LI Yangyang;  YE Ronglai;  SUN Hongjie
School of Automobile, Changan University, Xian 710064, Shaanxi, China
Keywords:
automobile engineering;  emission control;  review;  reaching China Ⅵ emission standard;  selective catalytic reduction (SCR);  ammonia slip catalyst (ASC);  diesel fuelled vehicle
PACS:
-
DOI:
-
Abstract:
In order to further improve the pollutant removal capability of the China Ⅵ diesel vehicles and develop a more effective aftertreatment system, the advances and application status in selective catalytic reduction (SCR) and ammonia slip catalyst (ASC) were reviewed. The reaction mechanisms of SCR and ASC were discussed, and various catalysts of the two technologies and their application advantages were introduced. In addition, the influence of catalyst type, carrier, structure, and reaction conditions on NOx reduction activity, N2O emission and NH3 slip of SCR, NH3 conversion and N2 selectivity of ASC were introduced. The results show that as to the two SCR catalysts, the Cuzeolite catalyst has wider activity temperature window and excellent catalytic activity than Vbased catalyst. However, it also faces the challenges of N2O generation and NH3 slip. As to the three kinds of ASC, the noblemetal catalyst has a higher NH3 oxidation activity, but lower N2 selectivity while zeolite catalyst shows the opposite behavior. Combining the two advantages, the duallayer catalyst can simultaneously achieve high NH3 conversion and N2 selectivity over wider temperature range. But all three catalysts are limited by the N2O emission problem. Therefore, the Cuzeolite catalyst is the most promising catalytic converters for SCR, while the doublecoated ASC catalyst can more efficiently reduce the increased NH3 caused by the Cuzeolite catalyst. Although both of these technologies can meet current diesel vehicle emissions standards, there are still shortcomings in existing technologies. It is necessary to further solve the N2O generation problems in the catalytic process. The future development of SCR and ASC research will be mainly focused on the coupling of the two technologies, and the joint development of control systems to achieve the high SCR and ASC performance at the same time. 3 tabs, 9 figs, 78 refs.

References:

Memo

Memo:
-
Last Update: 2022-04-06