Abstract
Three different transition metals (V, Mn and Cu) supported on TiO2, MgO and CeO2, were investigated for their performances in dichloromethane oxidation (500 ppm, 704,867 h−1) in moist conditions as a model reaction for the destruction of chlorinated volatile organic compounds. The catalysts were prepared by sol–gel method followed by wet impregnation of V, Mn or Cu precursors. The activities were evaluated in the temperature range from 100 to 500 °C with 5 °C min−1 temperature rise. The orders of activity and selectivity to HCl of the catalysts is CuTi > VMg > CuCe > CuMg. A correlation between acidic properties of support and performances was observed as the activity of copper catalysts followed the acidity order of supports.
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Acknowledgments
The authors are grateful to Ms Julie Rousseau, Ms Christelle Roudaut and Mr Jean-Dominique Comparot for their help during the characterization of the catalysts in IC2MP-Poitiers. PHC Volubilis is gratefully acknowledged by the authors for the financial support of this work.
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Appendix: HSC Calculation
Appendix: HSC Calculation
1.1 Initial Composition:
- Pressure:
-
1 bar
- Raw materials: kmol:
-
Total: 1 kmol = 1,000 mol
- CH2Cl2 (g):
-
0.48 mol (around 0.5 mol/1,000 mol = 500 ppm)
- H2O:
-
15 mol (15/1,000 = around 1.5 %)
- O2 :
-
200 mol (air : 20 % O2, 80 % N2 so 20 % × 1,000 = 200 mol)
- N2 :
-
784.52 mol (complement to 1 kmol, inert gas in excess)
- MgO:
-
1.8 mol
The reaction between HCl and MgO versus temperature.
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El Assal, Z., Pitkäaho, S., Ojala, S. et al. Total Oxidation of Dichloromethane Over Metal Oxide Catalysts. Top Catal 56, 679–687 (2013). https://doi.org/10.1007/s11244-013-0025-2
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DOI: https://doi.org/10.1007/s11244-013-0025-2