Chromatography Forum

We want to do quantitative estimation of the gases evolved during coal gasification. For that we want to buy TGA-GC-MS. We'll be going upto 1750 degrees centigrade. TGA-GC-MS is not available which can go upto such high temperature. Can TGA-MS fulfill our requirement? How can we do quantitation of the gases evolved?
Can anyone suggest a solution?

I'm not sure what you mean by TGA-GC-MS can't go that high. When you are above 400C you will be pyrolyzing compounds, and the molecular weight of most of the fragments will be low enough to pass through a GC column into a mass spec. Of course the transfer line would have to be hot enough to prevent condensation, but the same would apply to TGA-MS.

I'm not sure what you mean by TGA-GC-MS can't go that high. When you are above 400C you will be pyrolyzing compounds, and the molecular weight of most of the fragments will be low enough to pass through a GC column into a mass spec. Of course the transfer line would have to be hot enough to prevent condensation, but the same would apply to TGA-MS.

Thanks for the quick response. May be TGA-MS can serve the purpose. Only thing is if 2-3 gases evolve at the same temperature, then may be it is difficult to find the exact amount of each gas evolved. That is why, we thought about TGA-GC-MS.

As long as you have masses for each gas evolved that are not in the other evolved gases you should not need separation to quantitate the gases.

DSC IS SUITABLE AT HIGH TEMPARTURE TO FIND OUT SOLVENT SEPARATIONS.

As long as you have masses for each gas evolved that are not in the other evolved gases you should not need separation to quantitate the gases

Ron:
Separation will probably be required because ethylene and nitrogen have the same nominal mass (28) - unless you have a fancy high res. ms!