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Photocatalytic degradation of an organic dye in some aqueous buffer solutions using nano titanium dioxide: A kinetic study

Montazerozohori M., Nasr-Esfahani M., Joohari S.

Environment Protection Engineering

2012

Vol. 38, nr 3

45--55

Photocatalytic degradation of an organic dye, emerald green, on nano titanium dioxide (anatase 99.5%) at basic buffer pH of 7, 8 and 9 has been investigated. The effects of various operating parameters such as initial concentration of dye, catalyst dosage, bufferic pH and irradiation time on photocatalytic degradation have been studied in a photoreactor cell containing high pressure mercury lamp to obtain the optimum conditions. COD removal was found to be 65-71% confirming considerable mineralization. The photodegradation of the dye obeyed a pseudo-first order kinetics according to the Langmuir-Hinshelwood model at all used buffer pH. The observed rate constants (Kobs) of photocatalytic degradation were 3.3 ×10-2 min-1, 7.09 × 10-2 min-1 and 1.32 × 10-1 min-1 at buffer pH of 7-9 respectively. Furthermore, the Langmuir-Hinshelwood rate constants, kr and adsorption constants, KA are reported for current process at various buffer pH.

Kinetic model for selective oxidation of o-xylene to phthalic anhydride in terms of catalyst deactivation

Krajewski W., Najzarek Z.

Chemical and Process Engineering

2007

Vol. 28, z. 4

899-908

he process of selective oxidation of o-xylene in a tubular reactor over a vanadia-titania catalyst (V2O5/TiO2) with the catalyst thermal deactivation have been described by means of the Langmuir-Hinshelwood kinetics, while the Erofeev equation for the catalyst deactivation was adopted. On the basis of the model, the kinetic constants have been calculated for eight oxidation reactions from the substrate to the products. Moreover, the catalyst deactivation constants have been determined. The calculation results predict correctly measurements data for the process in the tubular reactor.

Model procesu selektywnego utleniania o-ksylenu w reaktorze rurowym na katalizatorze wanadowo-tytanowym (V2O5/TiO2) z uwzględnieniem termicznej dezaktywacji katalizatora opisano kinetyką Langmuira-Hinshelwooda, a dezaktywację katalizatora wanadowo-tytanowego równaniami Jierofiejewa. Obliczono stałe kinetyczne dla ośmiu reakcji utlenienia od substratu do produktów oraz wyznaczono stałe dezaktywacji katalizatora. Wyniki obliczeń są zgodne z wynikami pomiarów dla procesu w reaktorze rurowym.