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zzhnyf铜虫 (小有名气)
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[求助]
Quadrupole mass spectrometer, quantitative analysis of gas mixture
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Dear friends, Now I encounter a big problem. My system consists of propane and oxygen with carrier gas argon, I can control and detect the flow rate and gas concentration (V%) at the inlet. After reaction, I want to know the concentration of unreacted propane at the outlet in order to calculate the conversion. Also I am interested in the productions distribution like propylene , ethylene, ethylene, methane. As you know, it is extremely tricky to quantitative analysis these organic molecules only using quadrupole mass spectormeter, which actually is very powerful. I failed to detect the gas concentration of each species, for their mass signals overlap too much. For example, propane and propylene share the same signal at m/z=41,28,29 etc. It will be more complicated when taking ethylene, ethane and methane into consideration. I understand it is easy to solve this problem combined QMS with gas chromatograph, the well-known system GC-MS. But we don't have GC in our lab. Now I borrowed an old one from other group. And I still don't want to give up my QMS. After all, it cost more than 40 thousand euro. I cannot believe that it is unable to solve such a (deceptively) simple problem. So I am wondering if there were some experienced guys who are willing to provide me with some suggestions, both negative or positive. Thank you in advance. XIAO MU CHONG |
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