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Rare earth salt of 12-tungstophosphoric acid supported on iron oxide as a catalyst for selective catalytic reduction of NOx.
- Source :
-
Fuel Processing Technology . Sep2018, Vol. 178, p262-270. 9p. - Publication Year :
- 2018
-
Abstract
- A series of rare earth Keggin-type tungstophosphorate doped iron oxide catalysts were prepared by physical mixing method. The effects of type and the content of rare earth element over NH 3 -SCR activity were investigated and the catalysts were characterized by FT-IR, XRD, SEM, EDS, XPS, BET, TGA, ICP-AES, H 2 -TPR and NH 3 -TPD. It is indicated that the addition of rare earth Keggin-type tungstophosphorate could increase the NH 3 -SCR activity of the iron oxide catalysts, while the effect of rare earth species on SCR activity over Fe y O x is not obvious. Effects of O 2 concentration, SO 2 and SO 2 + H 2 O on NH 3 -SCR activity over NdPW/Fe y O x(25) and the control experiments were also investigated, the results of which illustrates that O 2 exerts a significant promotion effect on the SCR reaction and the impact of SO 2 (470 ppm) on catalytic activity is almost negligible. NdPW/Fe y O x(25) presents appealing properties of hydrothermal stability and SO 2 -tolerance, and exhibits a great potential in practical applications. [ABSTRACT FROM AUTHOR]
- Subjects :
- *RARE earth salts
*PHOSPHORIC acid
*FERRIC oxide
*CATALYTIC reduction
*KEGGIN anions
Subjects
Details
- Language :
- English
- ISSN :
- 03783820
- Volume :
- 178
- Database :
- Academic Search Index
- Journal :
- Fuel Processing Technology
- Publication Type :
- Academic Journal
- Accession number :
- 131182816
- Full Text :
- https://doi.org/10.1016/j.fuproc.2018.06.001