In situ characterisation of absorbing species in stationary premixed flat flames using UV–Vis absorption spectroscopy

Abstract

A one-dimensional premixed ethylene–air flame is investigated regarding the presence of various combustion intermediates and products relevant for the formation of carbonaceous particles for various equivalence ratios and spatial positions using in situ UV–Vis absorption spectroscopy. A laser driven light source in combination with a fast spectrometer allow to record absorption spectra at a high rate required for practical combustion devices. The approach is coupled with a least squares regression procedure using a database of several absorbing species in the flame. To account for the high temperature flame conditions, the absorption spectra are convoluted by a simplified Maxwell–Boltzmann distribution model. While the approach is based on several assumptions and a verification requires future detailed intercomparison with other techniques, a first semi-quantitative evaluation can be obtained. This novel approach opens a potential route to the in situ measurement of the evolution of polycyclic aromatic hydrocarbons (PAHs) in flames.

Gum-based nanocomposites for the removal of metals and dyes from waste water

“…NMR and XPS can be used to better understand the adsorption process and the quality of the adsorption forces at work. UV-Vis spectroscopy is another effective method to analyze the electronic configuration of samples, particularly those containing aromatic compounds or a broad range of UV-Vis active compounds (Bauer et al 2021 ).…”