2196701
Descripción
Mapa Mental por Charlotte Lyon-Tiger, actualizado hace más de 1 año
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Creado por Charlotte Lyon-Tiger
hace alrededor de 9 años
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Module 4
'Resources'
- Greenhouse effect
- Major role in maintaining surface
temperature of the Earth
- Human activity= producing more,
affecting natural balance
- Global warming
- The process in which absorption and subsequent emission
of infrared radiation by atmospheric gases warms the lower
atmosphere and the planet's surface
- equilibrium
- atmospheric gases absorb energy at the same rate it radiates energy
- equilibrium
- Methane
CH4
- Carbon Dioxide
CO2
- Water
H2O
- Major role in maintaining surface
temperature of the Earth
- Ozone production/breakdown
- Production
O2------>2O
O+O2------------->O3+heat
- Production
O2------>2O
O+O2------------->O3+heat
- Breakdown
O2+O-------------> 2O2
- Ozone levels dropping
- CFCs
- CFCl3--------->Cl.+.CFCl2
- Cl.+O3---------->ClO.+O2
ClO.+O--------->Cl.+O2
- O3+O-------->2O2
- O3+O-------->2O2
- Cl.+O3---------->ClO.+O2
ClO.+O--------->Cl.+O2
- Lifetime in atmosphere
~50 to +100 years
- CFCl3--------->Cl.+.CFCl2
- Control of Pollution
- Montreal Protocol
- CFCs: zero
production by 2000
- HCFCs replaced CFCs
in ~15% of
applications
- CFCs: zero
production by 2000
- Catalytic Converter
- Fitted to all cars in EU
produced after 1993
- Made from
platinum, palladium
and rhodium on
honeycomb mesh
- Larger surface
area
- Expensive to replace
- Hot gas pass over
catalytic surface
- 2CO(g)+O2(g)-------->2CO2(g)
- C12H26(l)+18.5O2(g)------->12CO2(g)+13H2O(l)
- 2NO(g)+2CO(g)------>N2(g)+2CO2(g)
- 2CO(g)+O2(g)-------->2CO2(g)
- CO and NO molecules
diffuse over catalytic
surface of metal. Some held
on by ADSORPTION
- Temporary bonds form between catalytic surface and molecules
- Molecules react with each other
- NO2 and CO2 are DESORBED from surface and diffuse from surface
- Larger surface
area
- Fitted to all cars in EU
produced after 1993
- Kyoto Protocol
- Reduce
greenhouse
gases by 5%
- Reduce
greenhouse
gases by 5%
- EU strategy
- Cleaner cars
- 20% energy from renewable sources by 2020
- 10% energy from biofuels
- Cleaner cars
- Carbon Capture and Storage
- Immediate strategy
- Decarbonised fuel
- Piped into oilfield nearing end of
productive life
- Storage as carbonates
- CaO(s)+CO2(g)----->CaCO3(s)
- Naturally very slow, and
energy would need to be
used to make process
efficient
- CaO(s)+CO2(g)----->CaCO3(s)
- Immediate strategy
- Montreal Protocol
- Sustainability
- Renewable
sources
- Saving money
- Preventing waste
- Atom economy
- Recycling/biodegradability
- Renewable
sources
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