Nuclear Production of Hydrogen, Fourth Information Exchange ...
Nuclear Production of Hydrogen, Fourth Information Exchange ... Nuclear Production of Hydrogen, Fourth Information Exchange ...
STUDY OF THE HYDROLYSIS REACTION OF THE COPPER-CHLORIDE HYBRID THERMOCHEMICAL CYCLE USING OPTICAL SPECTROMETRIES The hydrolysis reaction kinetics using optical absorption spectrometries For a better control of the kinetics of the reactions, the use of optical spectrometries is proposed. Based on our experiences regarding the study of VLE measurements for the iodine-sulphur thermochemical cycle, the use of FTIR spectrometry to study the kinetics of the hydrolysis reaction is proposed. The experimental set-up is modified to allow FTIR measurements using a Bruker tensor 27 spectrometer (Figure 7). Figure 7: Photograph of the experimental set-up with FTIR spectrometer FTIR spectrometry allows the measurement of H 2 O and HCl concentrations in the gaseous phase. It is first used to monitor CuCl 2 , 2H 2 O dehydration. It is then used to follow the kinetics of the hydrolysis reaction. The validity of the choice of FTIR spectrometry for HCl concentration measurement is checked with conductimetry measurements. Figure 8: Dehydration of CuCl 2 , 2H 2 O: H 2 O monitoring using FTIR spectrometry 248 NUCLEAR PRODUCTION OF HYDROGEN – © OECD/NEA 2010
STUDY OF THE HYDROLYSIS REACTION OF THE COPPER-CHLORIDE HYBRID THERMOCHEMICAL CYCLE USING OPTICAL SPECTROMETRIES Figure 9: Dehydration of CuCl 2 , 2H 2 O: water loss versus time 0.4 0.35 0.3 Absorbance 0.25 0.2 0.15 0.1 0.05 Absorbance à 5345 cm-1 0 0 10 20 30 40 50 60 70 time UA Figure 10: Hydrolysis reaction monitored using FTIR spectrometry: H 2 O and HCl concentrations versus time 1.60E+00 1.40E+00 1.20E+00 HCL(%) H2O (%) Concentration [%v] 1.00E+00 8.00E-01 6.00E-01 4.00E-01 2.00E-01 0.00E+00 -15 5 25 45 65 85 105 125 -2.00E-01 time (UA) Conclusions In order to assess the viability of the copper-chloride hybrid thermochemical cycle, a dedicated experimental programme has been conducted. The existence of side reactions giving rise to molecular chlorine has been demonstrated. A careful control of the temperature of the hydrolysis reaction enables a complete formation of Cu 2 OCl 2 . To have a better control of the kinetics of the hydrolysis reaction, the use of FTIR spectrometry enablea to follow H 2 O and HCl concentrations versus reaction time. It is used to first monitor CuCl 2 dehydration and then control the hydrolysis reaction by following H 2 O and HCl concentrations versus reaction time. Future developments will be focused on oxygen measurement in the high temperature reaction of the cycle using if possible optical absorption technique. NUCLEAR PRODUCTION OF HYDROGEN – © OECD/NEA 2010 249
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STUDY OF THE HYDROLYSIS REACTION OF THE COPPER-CHLORIDE HYBRID THERMOCHEMICAL CYCLE USING OPTICAL SPECTROMETRIES<br />
The hydrolysis reaction kinetics using optical absorption spectrometries<br />
For a better control <strong>of</strong> the kinetics <strong>of</strong> the reactions, the use <strong>of</strong> optical spectrometries is proposed.<br />
Based on our experiences regarding the study <strong>of</strong> VLE measurements for the iodine-sulphur<br />
thermochemical cycle, the use <strong>of</strong> FTIR spectrometry to study the kinetics <strong>of</strong> the hydrolysis reaction is<br />
proposed. The experimental set-up is modified to allow FTIR measurements using a Bruker tensor 27<br />
spectrometer (Figure 7).<br />
Figure 7: Photograph <strong>of</strong> the experimental set-up with FTIR spectrometer<br />
FTIR spectrometry allows the measurement <strong>of</strong> H 2 O and HCl concentrations in the gaseous phase.<br />
It is first used to monitor CuCl 2 , 2H 2 O dehydration. It is then used to follow the kinetics <strong>of</strong> the hydrolysis<br />
reaction. The validity <strong>of</strong> the choice <strong>of</strong> FTIR spectrometry for HCl concentration measurement is<br />
checked with conductimetry measurements.<br />
Figure 8: Dehydration <strong>of</strong> CuCl 2 , 2H 2 O: H 2 O monitoring using FTIR spectrometry<br />
248 NUCLEAR PRODUCTION OF HYDROGEN – © OECD/NEA 2010
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