I'm trying to analyze gaseous stream composition in biomass pyrolysis, using a GC/MS.
Serguei, We have used Helium (He) in a Py-GC/MS system to carry the pyrolisates to the collumm of GC because other gases like N react with the sample and alter the results. But what do you want to do? Carbonize or pyrolyse the biomass? You will have different results because the first uses O2 and the other no. You have a pyrolyser furnace connected to the GC/MS system? What´s the goals of your projetct?
Fernado, we are trying to analyze the gas stream composition resulting from biomass pyrolisis using N2. I don´t have a pyroliser attacched to GC/MS, I use a reactor to do this and I take samples each 50°C during the experiment. The problem is the long time required for the GC/MS to analyze one experimental point. So, I thought that, maybe is possible to "cacth" some VOCs in any solvent and analyze it after, using autosample overnight. That's the idea.
Ok...well, i can not exactly realize your metogology, but I know that N reacts with the VOCs when we make the pyrolysis, but take a look in the metodology of this paper (SPACCINI, R; PICCOLO, A. 2009. Molecular characteristics of humic acids extracted from compost at increasing maturity stages. Soil biology and Biochemistry. v.41(6), p. 1164-1172.). Perhaps helps you.
I expect a lot of water from your biomass. I would use several traps. One to condense the heavier organics at 10 or 5 Celsius, then a trap to remove water as ice and finally a trap with liquid nitrogen to collect gas without water.
We using direct pyrolysis for soil ... we have EGA/PY-3030D, PY-3030S (Frontier Lab) operating together with GSMS QP 2010 (Shimadzu)
In the case of bigger plant for biomass pyrolysis we using purge gas-sampling system..with 6-port valve which is again connected wit GC/MS
Serguei, we can try Helium like stream gas for pyrolysis in a next step in our research. Effectively, like Fernando says, N2 reacts with some VOCs.
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