TGA-GC-MS

[Amruta Tambe]

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?

[Ron]

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.

[Amruta Tambe]

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.

[Ron]

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.

[mohan]

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

[Ian]

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!