Production of hydrogen by thermocatalytic cracking of natural gas. Task 4 report; Annual report
The conventional methods of hydrogen production from natural gas, for example, steam reforming (SR), are complex multi-step processes. These processes also result in the emission of large quantities of CO{sub 2} into the atmosphere. One alternative is the single-step thermocatalytic cracking (TCC) (or decomposition) of natural gas into hydrogen and carbon. The comparative assessment of SR and TCC processes was conducted. Thermocatalytic cracking of methane over various catalysts and supports in a wide range of temperatures (500--900 C) and flow rates was conducted. Two types of fix bed catalytic reactors were designed, built and tested: continuous flow and pulse reactors. Ni-Mo/Alumina and Fe-catalysts demonstrated relatively high efficiency in the methane cracking reaction at the range of temperatures 600--800 C. Fe-catalyst demonstrated fairly good stability, whereas alumina-supported Pt-catalyst rapidly lost its catalytic activity. Methane decomposition reaction over Ni-Mo/alumina was studied over wide range of space velocities in a continuous flow fixed bed catalytic reactor. The experimental results indicate that the hydrogen yield decreases noticeably with an increase in the space velocity of methane. The pulse type catalytic reactor was used to test the activity of the catalysts. It was found that induction period on the kinetic curve of hydrogen production corresponded to the reduction of metal oxide to metallic form of the catalyst. SEM method was used to study the structure of the carbon deposited on the catalyst surface.
- Research Organization:
- Florida Solar Energy Center, Cocoa, FL (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
- DOE Contract Number:
- FG04-94AL85802
- OSTI ID:
- 564093
- Report Number(s):
- DOE/AL/85802-T2-Pt.4; FSEC-CR-857-95-Pt.4; ON: DE98002552; TRN: AHC29804%%57
- Resource Relation:
- Other Information: PBD: Oct 1995
- Country of Publication:
- United States
- Language:
- English
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