In article , Steve Firth
writes
Mark Townend wrote:

No, running a bus on methane means that CO2 is emitted from the bus (as
well as water) hence it's not "zero emission".

I never said it was

No, some ****wit from LT on R4 this week was trying to claim it was.



I hate to spoil the party, but the buses are running on tanks of
compressed hydrogen (at 350 bar). The hydrogen is supplied from the BOC
plant as liquid hydrogen. (This is only because Hackney refused planning
permission for a hydrogen filling station at (IIRC) Ash Grove. Goodness
knows why, hydrogen is only as volatile as LPG).

There is no methane involved. There are no carbon emissions. Only water.
You do not have your facts correct.

If you use methane as a hydrogen source for fuel cells then you would
use a hydrogen generator, and a CRT style carbon trap (as used on modern
diesel buses) to scrub the carbon particulate out of the generator
exhaust.

Mass production of hydrogen is way more efficient than using methane to
do localised production - and it's easier to control and monitor the
emissions created in producing the hydrogen.

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Steve
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