Lecture 13Alternative energy sources
Biodiesel from plant oils and from Aglae
Synthesis gas (syngas)
Water-gas shift reaction
CO2+H2 <---> CO +H2O
ΔH=41.2 kJ/mol
Ethers as Fuel additives
Octane number 116
Hydrogen - fuel of the future?
Energy from natural gas can be transferred to hydrogen with
efficiency of about 72%
The three reactions that produce hydrogen are as follows:
1. I2 + SO2 + 2 H2O → 2 HI + H2SO4 (120°C) ◦ The HI is then separated by distillation. Note that concentrated H2SO4 may react
with HI, giving I2, SO2 and H2O (backward reaction). Many chemical processes are reversible reactions, such as ammonia production from N2 and H2, but removing the desired product will shift equilibrium to the right. This reaction is sometimes referred to as Bunsen reaction.
2. 2 H2SO4 → 2 SO2 + 2 H2O + O2 (830°C) ◦ The water, SO2 and residual H2SO4 must be separated from the oxygen
byproduct by condensation. 3. 2 HI → I2 + H2 (320°C) ◦ Iodine and any accompanying water or SO2 are separated by condensation, and
the hydrogen product remains as a gas. Net reaction: 2 H2O → 2 H2 + O2 !
Storing hydrogen
Hydroelectric power
Wind energy
Geothermal energy
Nuclear Energy