Biofuels Flashcards
1
Q
Fossil fuels to biofuels
A
Coal –> biomass pellets
Oil –> bioethanol, biodiesel etc.
Natural gas –> synthetic natural gas
2
Q
Bioethanol
A
Made from sugar and starches
Maize: grow in harsh conditions; high carbon needed for fermentation, distillation, dehydration and supply chain; ghg savings; land use changes
Sugar cane: grow in only good conditions; very high ghg savings
3
Q
Biodiesel
A
Oils/fats from plants
Transesterification process
4
Q
Use non food crops
A
Wood/agricultural waste
Burn directly
Good at small scale; large insfrastructure changes needed for large scale
Particulate pollution
5
Q
Cellulosic ethanol
A
Use non edible part of crop
Turn structural carbohydrates into sugars before fermation
High energy and inefficient
