Performances of novel sulfated ceria–zirconia catalysts for the selective catalytic reduction of NOx by ethanol
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| Title: | Performances of novel sulfated ceria–zirconia catalysts for the selective catalytic reduction of NOx by ethanol |
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| Authors: | Westermann, Alexandre1, Azambre, Bruno bazambre@univ-metz.fr |
| Source: | Catalysis Today. Nov2011, Vol. 176 Issue 1, p441-448. 8p. |
| Subjects: | Cerium oxides, Zirconium oxide, Chemical reduction, Nitrogen oxides, Ethanol, Sulfates, Acetaldehyde, Chemical decomposition, Metal catalysts |
| Abstract: | Abstract: In this study, sulfated ceria–zirconia (SCZ) catalysts with increasing Ce molar fractions (xCe=0; 0.21; 0.5; 0.75 and 1) were prepared by direct sulfation of the crystallized CZ nanopowders in 0.5M H2SO4. As revealed by XRD and TGA, the sulfation treatment created surface sulfates with a density of 2–3 SO4 2−/nm2 whatever the Ce content while maintaining the original crystalline structure of the CZ material. The investigation of ethanol-SCR performances under (1920ppm NO+3020ppm C2H5OH+5% O2) TPSR and steady-state conditions allowed to obtain N2 yields superior to 45% on the most active SCZ catalysts around 350–400°C. Catalytic results relative to the sulfated and non-sulfated catalysts are then discussed according to the Ce molar fraction and the CZ structure. The possible reaction pathways involved in the formation/decomposition of some important SCR intermediates such as ethylnitrite, acetaldehyde, HCN and NH3 are examined on the basis of the collected TPSR data. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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