Improving quantification of hydrogen peroxide by synchrotron vacuum ultraviolet photoionization mass spectrometry

Author：Dong, B., Hu, Z. H., Xu, Q., Liu, B. Z., Zhu, Q. B., Guan, J. W., Liu, C. Y., Pan, Y., Hu, L. H., Fang, J., Wang, Z. D.

Journal：Combustion and Flame

DOI:  10.1016/j.combustflame.2022.112214

Keywords: Hydrogen peroxide, Mass spectrometry, Photoionization cross section, Quantification, Autoxidation, low-temperature oxidation, jet-stirred reactor, cross-sections, elevated-temperatures, h2o2, ho2, autoxidation

Abstract: 

Hydrogen peroxide (H 2 O 2 ) plays a key role in the autoxidation of fuels related to ignition in compression engines, and in the degradation of volatile organic compounds (VOC) in the atmospheric autoxidation. Advanced synchrotron vacuum ultraviolet radiation photoionization mass spectrometry (SVUV-PIMS) is widely used for in-situ analysis of H 2 O 2 in the gas phase autoxidation process. However, considerable uncertainty has been observed in the quantification of H 2 O 2 by SVUV-PIMS. This work improves the quantification of H 2 O 2 by re-evaluating its photoionization cross section (PICS). Spray vaporization, combined with a low pressure flow reactor, was used to minimize decomposition and wall loss of H 2 O 2 in the PICS measurement. It was found that the PICS of H 2 O 2 obtained here was lower than that reported in the literature by a factor of two. Adopting this newly obtained PICS significantly improved quantification of H 2 O 2 , and will prove valuable in evaluating the reaction kinetics of H 2 O 2 and the development of combustion and atmospheric autoxidation models.(c) 2022 The Combustion Institute. Published by Elsevier Inc. All rights reserved.