Electrochemical reduction of NOx - DTU Orbit

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4 DRIFT study of NOx adsorption on CGO10 impregnated with K2O or BaO Table 4. Wavenumbers (cm -1 ) at which peaks ascribed to adsorbed NOx-species were observed on K2O impregnated CGO at 300 °C and at 500 °C, while the sample was supplied with 1000 ppm NO + 10% O2. The assignment of the peaks with references is also stated. 300 °C 500 °C Assignment Ref 2757 (K)NO3 - 2553(neg) ? 2522 ? 2467 2400 (K)NO3 - 2356 ? 2069 ? 2018 ? 1883 NO 1767 (K)NO3 - (K)NO3 - 1731(neg) 1723(neg) cis-N2O2 2-. 1573(neg) 1560(neg) NO3 - ( bidentate) 1514 NO3 - ( bidentate) 1343 solid KNO3/molten KNO3 38 136 136 136 137 136 129 116, 126, 127 117, 126, 127 136
4 DRIFT study of NOx adsorption on CGO10 impregnated with K2O or BaO For the BaO impregnated sample the background spectra looked similar to the background spectra of the non-impregnated sample. In the absorbance spectra recorded on the BaO impregnated sample clear peaks were observed, see Figure 15 and Table 5. Several peaks observed at the highest wavenumbers could not be identified by comparison to literature, but the peak observed at ≈2390 cm -1 is likely ascribed to Ba(NO3)2 138 and the small peak observed at 2221 cm -1 to N2O 114, 126, 130 . All the peaks observed at lower wavenumbers (below 1800 cm -1 ) could by comparison to literature be assigned to either Ba(NO3)2 70, 120, 138 or Ba(NO2) (monodentate nitrite) 70 . When the temperature is increased from 300 to 500 °C the intensity of the peaks decreases, i.e. there becomes less of the adsorbed species, but only the N2O and the Ba(NO3)2 at 1358 cm -1 disappears entirely due to the temperature increase. Absorbance 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 4000 non-impregnated, 300 °C BaO impregnated, 300 °C BaO impregnated, 500 °C 3500 3000 Wavenumber [cm -1 ] Figure 15. DRIFT spectra recorded at 300 °C on a non-impregnated sample and at 300 °C and 500 39 2500 2000 1500 °C on a BaO impregnated sample supplied with 1000 ppm NO + 10% O2. 1000
Page 1 and 2: Department of Energy Conversion and
Page 3 and 4: Preface Preface This thesis is subm
Page 5 and 6: Dansk resumé Dansk resumé NOx er
Page 7 and 8: Table of Contents 5.3 Experimental
Page 9 and 10: 1 Introduction 1 Introduction NOx i
Page 11 and 12: 1 Introduction 3, 12 Table 1. Emiss
Page 13 and 14: O 1 Introduction 2 2 NOx storage: N
Page 15 and 16: 1 Introduction the electrode materi
Page 17 and 18: 1 Introduction The main focus of th
Page 19 and 20: 2 Materials 2 Materials In this pro
Page 21 and 22: 2 Materials used promoter in conven
Page 23 and 24: 2.4 Material properties 2 Materials
Page 25 and 26: 3 Experimental Figure 1. Symmetric
Page 27 and 28: 3.2 Fabrication of electrodes 3 Exp
Page 29 and 30: 3 Experimental 3) Covering the cell
Page 31 and 32: 3 Experimental NO2* which decays to
Page 33 and 34: 4 DRIFT study of NOx adsorption on
Page 45: 4 DRIFT study of NOx adsorption on
Page 55 and 56: 4.5 Conclusions 4 DRIFT study of NO
Page 57 and 58: 5 Improvement of LSM15-CGO10 electr
Page 91 and 92: 6 NOx-conversion on Porous LSF15-CG
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6 NOx-conversion on Porous LSF15-CG
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7.1.3 SEM 7 NOx-conversion on LSF15
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7 NOx-conversion on LSF15-CGO10 cel
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8 NOx-conversion on LSM15-CGO10 cel
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8.5 Discussion 8 NOx-conversion on
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8.6 Conclusion 8 NOx-conversion on
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9.4 Conclusion 9 NOx-conversion on
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10 Measurements on LSM15-CGO10 elec
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11 Construction of an in situ XANES
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11.3 Experimental 11.3.1 Design of
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11.4 Results 11.4.1 Impedance measu
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11.4.2 XANES 11 Construction of an
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12 Overall Discussion, Conclusion a
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12.3 Outlook 12 Overall Discussion,
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References References 1 G. Rayner-C
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26 T. Hibino, Chem. Lett., 1994, 5,
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50 S. P. Jiang, J. Mater. Sci., 200
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References 73 T. J. Toops, D. B. Sm
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References 98 G. W. Coffey, J. Hard
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References 123 A. Laachir, V. Perri
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References 147 C. Lu, T. Z. Sholkla
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References 171 K. Adams, J. Cavatai
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Appendix A Appendix A The article
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temperature and in the presence of
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Table 1 Energy intervals and step s
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Figure 5 Impedance spectra, Nyquist
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Knibbe, R., Hauch, A., Hjelm, J., E
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Electrochemical reduction of NOx - DTU Orbit

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