Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
12 Cards in this Set
- Front
- Back
|
def: biomass
|
recently living organisms or their metabolic byproducts
|
|
|
def: biofuel
|
and fuel that is derived from biomass
|
|
|
Where does the energy in all biofuels originally come from
|
the sun
|
|
|
Factors to consider when choosing a crop for biofuels
|
Will it compete for food
Land Damage to the Environment Net energy ratio Net C ratio Economics |
|
|
Net energy ratio
|
amt energy through use of fuel/ amt energy it takes to produce it
|
|
|
Net carbon ratio
|
does it release too much CO2 to make the fuel?
|
|
|
bioethanol sources
|
1. corn
2. sugar cane 3. cellulosic ethanol: made from wood, grasses |
|
|
cellulase
|
beta 1-->4 glycosidic linkages are not easily hydrolyzed
cellulases catalyze the hydrolysis |
|
|
lignin
|
complez matrix of phenylpropanoids that lends strength to secondary cell walls and reduces their digestibility
used for burning. can't be converted into ethanol a cell wall component that inhibits ethanol production |
|
|
biodiesel
|
a combustible fuel derived from biological lipids
|
|
|
biodiesel sources
|
soybean oil
palm seed oil corn grain oil jathropa seed oil animal fat waste cooking oil |
|
|
what we want to do to engineer better biomass sources
|
higher yield, more efficient phtosynthesis, more stress resistant
easier to process into fuel more oil per kg plant tissue |
