Kinetic Analysis of the Photocatalytic Degradation of Ethylene over TiO2 Thin Films in a Batch Reactor

Rodica Elisabeta Stroe, Lasse Rosendahl

Research output: Contribution to conference without publisher/journalPosterResearch

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Abstract

The photocatalytic oxidation process has been recognized as an environmental friendly, sustainable and low-cost technology for air treatment. A photocatalytic batch reactor has been employed to assess the kinetics of the oxidation of ethylene (C2H4) over immobilized titanium dioxide (TiO2) and the effect of initial pollutant concentration on the kinetics. The rate model based on the simplified mono-molecular Langmuir-Hinshelwood (LH) kinetic model was found to represent the degradation satisfactorily, however with numerical constrains. These were overcome by employing two different approaches. On one hand the Langmuir-Hinshelwood model was solved by means of the Lambert W-function and on the other hand it was reduced to a pseudo-first order rate law, both resulting in a good fit to the experimental data, thus proving that the photodegradation of C2H4 over TiO2 can be modelled by a first order rate law under low concentration conditions. Moreover, both models give a linear dependence between the reaction rate and the initial C2H4 concentration, making an estimation of reaction rate as a function of concentration possible, for a larger interval of C2H4 concentrations.
To derive a mathematical dependence of kinetics on UV irradiance, experiments are conducted at varying values of irradiance, from 38 to 50 W/m2. Based on the results, the relation can be assumed to be linear, where increasing irradiance speeds up the reaction, up to a limit dictated by the catalyst.
Original languageEnglish
Publication date8 Apr 2019
Publication statusPublished - 8 Apr 2019
EventInternational Conference on Applied Catalysis and Chemical Engineering - Dubai, United Arab Emirates
Duration: 8 Apr 201910 Apr 2019
Conference number: 1
https://www.eigenscientificgroup.com/conference/catalysis-2019/

Conference

ConferenceInternational Conference on Applied Catalysis and Chemical Engineering
Number1
CountryUnited Arab Emirates
CityDubai
Period08/04/201910/04/2019
Internet address

Keywords

  • Photocatalysis
  • Kinetics
  • Ethylene
  • TiO2
  • Langmuir-Hinshelwood

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