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Determination of the Conversion and Efficiency for CO 2 in an Atmospheric Pressure Microwave Plasma Torch
Author(s) -
Wiegers Katharina,
Schulz Andreas,
Walker Matthias,
Tovar Günter E. M.
Publication year - 2022
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.202100149
Subject(s) - analytical chemistry (journal) , carbon monoxide , atmospheric pressure , energy conversion efficiency , chemistry , microwave , plasma , torch , volumetric flow rate , plasma torch , mass spectrometry , materials science , optoelectronics , catalysis , environmental chemistry , chromatography , biochemistry , oceanography , physics , quantum mechanics , geology , welding , metallurgy
In a 2.45 GHz plasma torch, carbon dioxide (CO 2 ) has been converted into carbon monoxide (CO) and oxygen (O 2 ) at atmospheric pressure. The conversion and the efficiency of the plasma have been determined using two independent measuring methods: mass spectrometry and Fourier transform infrared absorption spectroscopy. The conversion depends on the measurement position in the exhaust gas duct. The conversion values at the beginning of the exhaust gas duct are significantly higher (maximum conversion is 22 %) than in the thermalized state at the end of the duct. In the cold, thermalized state of the gas, the maximum conversion rate is 8 % at 1.5 eV molecule −1 . The maximum efficiency of 25 % is achieved at approximatively 0.6 eV molecule −1 operating at a microwave power of 0.48 kW and a mass flow of 12 slm CO 2 .