Journal
APPLIED SURFACE SCIENCE
Volume 529, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147019
Keywords
NO reduction; Ceria-zirconia; Copper; Surface Hydroxyl consumption; Surface Nitrites/nitrates formation; Oxygen vacancies
Categories
Funding
- Generalitat Valenciana [PROMETEO/2018/076]
- Spanish Ministry of Science and Innovation [PID2019-105542RB-I00]
- UE-FEDER funding
- Spanish Ministry of Science, Innovation and Universities [FPU17/00603]
Ask authors/readers for more resources
In this work, a fundamental and systematic study was conducted, leading to a better understanding of the phenomena occurring on the catalyst's surface during the NOx reduction process in NSR systems. For this purpose, ceria-based catalysts, with Cu in substitution of noble metal, have been synthesized and deeply characterized by means of XRF, XPS, in situ (XRD, Raman spectroscopy and DRIFTS), temperature-programmed reduction under H-2 (H-2-TPR) and under NO reaction (NO isothermal reaction + NO-TPR). The whole results show the key role of copper to promote the reducibility and the creation of oxygen vacancies, allowing a high NO consumption and fast kinetics of N2O and N-2 formation, until the oxygen vacancies consumption takes place. The study of the surface reactions taking place in the formation of adsorbed NOx species and the oxygen vacancies consumption with NO uptake is complex; however, a hydroxyl consumption route is found to be involved. The reduction of NO provided higher levels of N-2 at higher temperatures; also, a very high efficiency of the previously created oxygen vacancies was found for this process.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available