class10_w08

class10_w08 - Origins of fossil fuels Carbon cycling in the...

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Carbon cycling in the biosphere : CO 2 + H 2 O + hv CH 2 O + O 2 CH 2 O + O 2 CO 2 + H 2 O Not a closed loop: some plant and animal matter is buried, accumulates in deposits at high T and P coal, oil and gas Origins of fossil fuels
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Peat Coal forming forest/swamp Lignite Bituminous Anthracite Coal : the remains of plant matter from very large woody swamps -Plant material is mainly cellulose and lignin Cellulose is degraded by aerobic bacteria
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Peat Coal forming forest/swamp Lignite Bituminous Anthracite Coal : the remains of plant matter from very large woody swamps -Plant material is mainly cellulose and lignin Lignin resists biological degradation The lignin accumulates under water, and over time compacts into peat Burial due to geological forces, compacting, high T and P coal. (further compression may yield graphite – a form of pure carbon)
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Peat Coal forming forest/swamp Lignite Bituminous Anthracite Types of coal Lignite – softest, 37% moisture, only 30% fixed carbon. Heating value low: 16 kJ/gram
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class10_w08 - Origins of fossil fuels Carbon cycling in the...

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