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- Title
Highly selective catalytic reduction of NO via SO/HO-tolerant spinel catalysts at low temperature.
- Authors
Cai, Xuanxuan; Sun, Wei; Xu, Chaochao; Cao, Limei; Yang, Ji
- Abstract
Selective catalytic reduction of NO by hydrogen (H-SCR) in the presence of oxygen has been investigated over the NiCoO and Pd-doped NiCoO catalysts under varying conditions. The catalysts were prepared by a sol-gel method in the presence of oxygen within 50-350 °C and were characterized using XRD, BET, EDS, XPS, Raman, H-TPR, and NH-TPD analysis. The results demonstrated that the doped Pd could improve the catalyst reducibility and change the surface acidity and redox properties, resulting in a higher catalytic performance. The performance of NiCoPdO was consistently better than that of NiCoO within the 150-350 °C range at a gas hourly space velocity (GHSV) of 4800 mL g h, with a feed stream containing 1070 ppm NO, 10,700 ppm H, 2 % O, and N as balance gas. The effects of GHSV, NO/H ratios, and O feed concentration on the NO conversion over the NiCoO and NiCoPdO catalysts were also investigated. The two samples similarly showed that an increase in GHSV from 4800 to 9600 mL h g, the NO/H ratio from 1:10 to 1:1, and the O content from 0 to 6 % would result in a decrease in NO conversion. In addition, 2 %, 5 %, and 8 % HO into the feed gas had a slightly negative influence on SCR activity over the two catalysts. The effect of SO on the SCR activity indicated that the NiCoPdO possesses better SO tolerance than NiCoO catalyst does.
- Subjects
CATALYTIC reduction; NITRIC oxide synthesis; NICKEL oxides; SOL-gel processes; THERMAL desorption
- Publication
Environmental Science & Pollution Research, 2016, Vol 23, Issue 18, p18609
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-016-7061-y