Characterization of the active sites on the surface of alumina ethanol dehydration catalysts by EPR using spin probes, страница 10

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Figure captions

Figure 1. EPR spectra registered after adsorption of toluene (1), 0.04 M anthracene solution in toluene (2), and 0.02 M 1,3,5-trinitrobenzene (3) solution in toluene on Al₂O₃ activated at 400°C followed by heat treatment at 80°C for 12 h.

Figure 2. Effect of pretreatment temperature on the concentrations of the weak acceptor sites tested using anthracene and strong acceptor sites tested using toluene.

Figure 3. Dependence of the registered concentration of paramagnetic species on time after adsorption on 0.04 M anthracene solution in toluene at 20°C on Al₂O₃ (Condea) activated at 400°C.

Figure 4. Dependence of the ethylene formation rate on the concentrations of sulfate and chloride ions.

Figure 5. Effect of the concentration of the sulfates on the concentrations of detected acceptor and donor sites.

Figure 6. Effect of the concentration of the chloride ions on the concentrations of detected acceptor and donor sites.

Figure 7. Dependence of the ethylene formation rate on the concentration of weak acceptor sites. Условия – T=330^oC, t=0,5c

Figure 8. Dependence of the ethylene formation rate on the concentration of strong acceptor sites. - T=330^oC, t=0,5c

Figure 9. Dependence of the ethylene formation rate on the concentration of weak acceptor sites. – T=350^oC, t=0,5c