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In situ 1H NMR Imaging Study of Propagation of Concentration Waves in an Autocatalytic Reaction in a Fixed Granular Bed |
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| Authors: | Koptyug I V Lysova A A Parmon V N Sagdeev R Z |
| Institution: | (1) International Tomography Center, Siberian Division, Russian Academy of Sciences, Novosibirsk, Russia;(2) International Tomography Center, Siberian Division, Russian Academy of Sciences, Novosibirsk, Russia;(3) Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090, Russia;(4) Novosibirsk State University, Novosibirsk, 630090, Russia |
| Abstract: | The in situ 1H NMR technique was used to study the propagation of chemical waves during the liquid-phase Belousov–Zhabotinsky (BZ) reaction in a model fixed bed of grains consisting of chemically inert glass beads or quartz sand. The propagation of autocatalytic chemical waves in this bed is determined by the size of pores between the grains. The rate of wave front propagation is independent of the size of the grains involved in this bed but is much lower than that in the bulk of the homogenous aqueous phase. This may be attributed to the difference in the effective diffusion coefficients in the homogeneous liquid phase and in the bed. |
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