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A catalytic reactor for the trapping of free radicals from gas phase oxidation reactions
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10.1063/1.3492247
/content/aip/journal/rsi/81/10/10.1063/1.3492247
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/10/10.1063/1.3492247
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Chemical structure of DMPO and PBN spin traps (left) and trapping of a free radical (right).

Image of FIG. 2.
FIG. 2.

Schematic diagram of the spin trapping reactor (sizes quoted in millimeter).

Image of FIG. 3.
FIG. 3.

(a) Time of flight of the reactor effluents vs flow rate for a standard 5 cm (2.23 mm ID) pathway from the catalytic bed to the spin trapping solution. (b) Time of contact vs flow rate of the reactants over the catalytic bed ( bed thickness).

Image of FIG. 4.
FIG. 4.

EPR spectrum deconvolution of the spin adducts obtained during the thermal DCP decomposition at and 100 ml of inlet flow using DMPO as spin trap. (a) Experimental spectrum, (b) simulated spectrum, (c) di-t-alkyl nitroxide radical, (d) adduct, (e) adduct, and (f) carbon spin adduct.

Image of FIG. 5.
FIG. 5.

Relative DMPO spin adducts amount (to 100%) for the DCP decomposition for various inlet flows. (◻) adduct, (○) adduct, (△) di-t-alkyl nitroxide radical, and (▽) carbon spin adduct.

Image of FIG. 6.
FIG. 6.

EPR spectra of the spin adducts obtained during the aerobic oxidation of benzaldehyde in air, using PBN as a spin trap. (a) Benzaldehyde only with empty reactor, (b) reactor containing cobalt acetyl acetonate, (c) reactor containing manganese acetate, (d) simulated spectrum of test c, (e) simulated , and (f) adducts.

Image of FIG. 7.
FIG. 7.

EPR spectrum deconvolution of the spin adducts obtained during cyclohexane oxidation over at in aerobic conditions using DMPO as a spin trap. (a) Experimental spectrum and (b) simulated spectrum. (c) Di-t-alkyl nitroxide radical, (d) DMPO oxidation product, (e) adduct, (f) adduct, (g) adduct, (h) possible allyl radical, and (i) the characteristic adduct.

Image of FIG. 8.
FIG. 8.

DMPO spin adducts from the reaction of cyclohexane over at in aerobic conditions. Reactor outlets dimensional values as follows: (a) ID (time of flight 25 ms), (b) ID (time of flight 62 ms), and (c) ID (time of flight 484 ms) (5 cm of the heat exchanger is already included in the time of flight).

Image of FIG. 9.
FIG. 9.

DMPO spin adducts intensity decay for (◻) , (○) , and (△) .

Image of FIG. 10.
FIG. 10.

EPR spectra of spin adducts for the cyclohexane oxidation in air at over: (a) , (b) , and (c) , using DMPO as spin trap.

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/content/aip/journal/rsi/81/10/10.1063/1.3492247
2010-10-20
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A catalytic reactor for the trapping of free radicals from gas phase oxidation reactions
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/10/10.1063/1.3492247
10.1063/1.3492247
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