Molecular Beam Mass Spectrometry for Analysis of ... - EVUR

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Supplemental Slides Additional syngas analysis methods under development at NREL •High-resolution mass spectrometry •Diode laser spectroscopy •Laser ablation, REMPI/TOF •Advanced gas chromatography NATIONAL RENEWABLE ENERGY LABORATORY 6
High-resolution mass spectrometry JMS-GCmate II (JEOL Ltd., Japan) high-resolution magnetic sector mass spectrometer installed in TCPDU •Motivation: analysis of very low levels of DOEtargeted syngas impurities, e.g. NH 3, HCl, H 2S •Modified inlet system for continuous monitoring of syngas (still working on heated capillary inlet for tars) •Can resolve at m/z… 16: NH 2 + /CH4 + /O + 17: OH + /NH 3 + / 13 CH4 + 27: 13 C 2H 2 + /HCN + /C2H 3 + 28: CO + /N 2 + /C2H 4 + NATIONAL RENEWABLE ENERGY LABORATORY •Resolution of 5000 (m/ m) enables “accurate mass” measurements (elemental compositions) •Mass range: 1-3000 amu •Sensitivity: 30 pg/ L (ppt) •Capable of CI and direct insertion probe operation Relative Intensity (%) 80 44-CO2 60 100 16.0239-CH + 4 15.8 16.0 16.2 16.4 16.6 16.8 17.0 m/z 40 20 15.9877-O + 16.9957-OH + Limitations: •Capillary inlet may limit throughput of high-mass compounds •Magnet stability vs. ambient temperature •Ion source robustness? 16.9957-NH 3 + 27.9912-CO + 28.0024-N 2 + 27.96 27.98 28.00 m/z 28.02 28.04 0 0 20 40 60 80 100 m/z 28.0276-C 2H 4 + Mass spectrum of scrubbed, wood-derived syngas observed with high-resolution mass spectrometer 7
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Page 9 and 10: Laser ablation, REMPI/TOF • Labor

Molecular Beam Mass Spectrometry for Analysis of ... - EVUR

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