Methane pyrolysis in monovalent alkali halide salts: Kinetics and pyrolytic carbon properties
| Autor: | Brett Parkinson, Klaus Hellgardt, Clemens F. Patzschke, David C. Dankworth, Dimitrios Nikolis, Sumathy Raman |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Renewable Energy Sustainability and the Environment Kinetics Inorganic chemistry Energy Engineering and Power Technology Salt (chemistry) Halide chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Alkali metal 01 natural sciences Methane 0104 chemical sciences chemistry.chemical_compound Fuel Technology chemistry Pyrolytic carbon 0210 nano-technology Carbon Pyrolysis |
| Zdroj: | International Journal of Hydrogen Energy. 46:6225-6238 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.11.150 |
| Popis: | Methane pyrolysis in molten salts has the potential to provide low-cost, low-CO2 emission H2 on an industrial scale. The alkali halides (NaBr, KBr, KCl, NaCl, (Na,K)Br) are inexpensive and environmental benign salts, which may facilitate sequestration or sales of the produced carbon even if low-to-moderate amounts of salt remain trapped in the carbon. In this novel work, alkali halides have been tested as the liquid reaction media, and the results of kinetic measurements and carbon characterisation are reported. The observed activation energies were found to be in the range 223.5–277.6 kJ mol−1, which is significantly lower than those measured during gas-phase methane pyrolysis (~422 kJ mol−1). After washing procedures with deionised water, the purity of the produced carbon was in the range 91.7–97.4 atom% or 55.0–91.6 wt%, with the carbon purities correlating well with the salt compounds size and salt-carbon wettability. The carbon samples generated in each salt are all low density ( |
| Databáze: | OpenAIRE |
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