1. From the experience in the lab I work in, analyzing methane at a
combustion reactor temperature of ~950 degrees C is perfered over 850
degrees C. Otherwise methane might undergo incomplete combustion more
It obviously depends on the manufacturer of your furnace, how accurately
you measure the temperature, and if you get power fluctuations or outages,
but we usually have a few months lifetime leaving it constantly at 950
degrees C. (We build our own interfaces and use a thermcraft tubular
glass fiber furnace to heat our ceramic tube reactor filled with Cu/Ni/Pt
wires that subsequently get oxidized.)
2. The reactor requires frequent regeneration. We usually "recharge our
reactor by running pure oxygen through it between each set of samples.
This time frame varies on the time it takes to run a set of samples (from
a few hours to two days). This helps ensures the best possible combustion
We also incorporate an "oxygen trickle", where when the GC effluent is
being diverted away from the combustion reactor, a 1% oxygen in He is sent
through the combustion reactor. This helps maintain combustion capacity
during a long automated sequence of sample runs.
Hope this helps,
> Dear All
> I have the following queries which I want to share with this forum.
> 1. We are using GC-IRMS for d13C determinations of hydrocarbon gases. The
> Combustion interface (CuO) is at 8500C.Off late we noticed that our d13C
> values for methane are ~2 ‰ heavier than the actual. The d13C values for
> pure CO2 are OK.
> Can we increase the temperature of furnace without losing on its life
> 2. What temperature of furnace is to be maintained when we are not using
> this interface,does it require regeneration or replacement?
> Thanks & Best regards
> Harish Pande
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