[화학공학] Hydrogen Production for Fuel Cells(영문)

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레포트 > 공학계열
2010.06.30
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소개글

[화학공학] Hydrogen Production for Fuel Cells(영문)에 대한 자료입니다.

Introduction

High-temperature decomposition

-Thermo-chemical water splitting

Photo-electrolysis (photolysis)

Hydrogen from fossil fuels

-Production from natural gas

-Production from coal

Conclusion

-Possibility of commercialization

-Future of hydrogen production

본문내용

High-temperature decomposition

High-temperature splitting of water occurs at about 3000 °C. At this temperature, 10% of the water is decomposed and the remaining 90% can be recycled. To reduce the temperature, other processes for high temperature splitting of water have been suggested:

▸Thermo-chemical cycles.
▸Hybrid systems coupling thermal decomposition and electrolytic decomposition.
▸Direct catalytic decomposition of water with separation via a ceramic membrane (“thermo-physic cycle”).
▸Plasma-chemical decomposition of water in a double-stage CO2 cycle.

For these processes, efficiencies above 50 % can be expected and could possibly lead to a major decrease of hydrogen production costs. The main technical issues for these high-temperature processes relate to materials development for corrosion resistance at high temperatures, high-temperature
membrane and separation processes, heat exchangers, and heat storage media. Design aspects and safety are also important for high-temperature processes.

-Thermo-chemical water splitting
For example, Thermo-chemical water splitting is the conversion of water into hydrogen and oxygen by a series of thermally driven chemical reactions. Thermo-chemical water-splitting cycles have been known for the past 35 years. They were extensively studied in the late 1970s and 1980s, but have been of little interest in the past 10 years. While there is no

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