Journal
CHEMICAL ENGINEERING JOURNAL
Volume 347, Issue -, Pages 173-183Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.04.035
Keywords
NH3-SCR; Phosphorus; Surface acidity; Acid sites; Mechanism
Categories
Funding
- National Natural Science Foundation of China [21777081]
- National Key R&D Program of China [2017YFC0211003]
- Public Projects Foundation of China Ministry of Environmental Protection [201509021, 201509012]
Ask authors/readers for more resources
Phosphorus were employed to investigate the influences on the acid sites and reaction mechanism of FeTiOx SCR catalyst. The introduction of phosphorus inhibited the SCR activity by suppressing the redox property, decreasing the surface acidity and reducing the surface area. In particular, phosphorus preferentially bonded to the electron-deficient Ti4+ and Fe3+ cations on the surface as P-O-Fe and P-O-Ti, thereby blocking the Lewis acid sites (Fe-NH3 or Ti-NH3). Although phosphate provided additional Bronsted acid sites (P-O-NH4+), the larger decrease of Lewis acid sites results in the decrease of total surface acidity. The newly formed Bronsted acid sites showed less SCR active at low temperature and exhibited high thermal stability and reactivity at high temperature, which leads to a new pathway following the L-II mechanism and an enhancement of high temperature performance.
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