EPR Analysis of Biodiesel-Diesel Char

About 5 mg thermal char sample from the co-pyrolysis of biodiesel and commercial diesel was analyzed using a Bruker EMX-20/2.7 EPR spectrometer (X-band) with dual cavities, modulation and microwave frequencies of 100 kHz and 9.516 GHz, respectively [26 (link), 27 (link)]. The typical parameters were: sweep width of 200 G, EPR microwave power of 1–20 mW, and modulation amplitude of ≤ 6 G. Time constant and sweep time were 16 s and 84 s, respectively. The value of the g factors was calculated using Bruker’s WINEPR program, which is a comprehensive line of software that allows control of the Bruker EPR spectrometer, data-acquisition, automation routines, tuning, and calibration programs on a windows-based personal computer [28 (link)]. The actual g-value for the spectrum was estimated by comparison with a 2,2-diphenyl-1-picrylhydrazyl (DPPH) standard.

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Kibet J.K., Mosonik B.C., Nyamori V.O, & Ngari S.M. (2018). Free radicals and ultrafine particulate emissions from the co-pyrolysis of Croton megalocarpus biodiesel and fossil diesel. Chemistry Central Journal, 12, 89.

Publication 2018

EMX-20/2.7 EPR spectrometer (X-band) WINEPR program

Biodiesel Cavities Char Diphenyl Epr 1 Microwave Pyrolysis

Corresponding Organization : Egerton University

Other organizations : Kabarak University, University of KwaZulu-Natal

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Variable analysis

independent variables

Thermal char sample from the co-pyrolysis of biodiesel and commercial diesel

dependent variables

EPR (Electron Paramagnetic Resonance) spectrum of the thermal char sample

control variables

Sweep width of 200 G
EPR microwave power of 1–20 mW
Modulation amplitude of ≤ 6 G
Time constant of 16 s
Sweep time of 84 s
DPPH (2,2-diphenyl-1-picrylhydrazyl) standard for g-value estimation

controls

DPPH standard as a positive control for g-value estimation

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