Enhanced soot oxidation by oxygen vacancies via K+ doped CuFe2O4 spinel catalysts. (14th June 2022)

• Record Type: Journal Article
• Authors: Li, Tianle; Abuelgasim, Siddig; Wang, Wenju; Xiao, Yupeng; Liu, Chenlong; Ying, Yaoyao; Liu, Dong
• Is Part Of: International journal of energy research. Volume 46:Number 11(2022)
• Page Start: 15376
• Page End: 15386
• Publication Date: 2022-06-14
• Subjects: doping -- kinetic analysis -- oxygen vacancies -- potassium -- soot oxidation; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.8237
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: Soot particulate emitting from diesel engines are serious to both human health and environment. Efficient catalyst is vital in diesel particulate filter technology to decrease soot oxidation temperature. Cu1−x Kx Fe2 O4 (x = 0, 0.05, 0.1, and 0.15) catalysts are synthesized and analyzed with XRD, Raman, BET, SEM, TEM, TG, EDS, XPS, catalytic activity tests, and kinetic analysis. The results suggests that many factors affect the catalytic activity, and the contents of oxygen vacancies are dominant. A large amount of oxygen vacancies which facilitate to the soot oxidation are created with the assistance of K +, and they increase with the increasing doping contents. Excessive surface concentration of K + may lead to the partially covering of active sites of the catalysts. Therefore, Cu0.9 K0.1 Fe2 O4 catalyst exhibits the best catalytic activity in soot oxidation, which decreases the T max of soot by 279°C. This decrease makes it highly promising for application in diesel particulate filter. Abstract : The order of catalytic activity is CuFe2 O4 < Cu0.95 K0.05 Fe2 O4 < Cu0.85 K0.15 Fe2 O4 < Cu0.9 K0.1 Fe2 O4 . Surface oxygen vacancies are created by the doping of potassium to improve the catalytic performance of CuFe2 O4 . Kinetic analysis was used to investigate the mechanism between soot and Cu1−x Kx Fe2 O4 catalyst.