Exchanged zeolites with transition metals of the first period as photocatalyts for n-hexadecane degradation
✍ Scribed by Ahmed K. Aboul-Gheit; Sahar M. Ahmed; Samia A. Hanafy
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 563 KB
- Volume
- 288
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
The photodegradation of n-hexadecane (n-C 16 ) was tested using photocatalysts containing MOR, ZSM-5 or Y zeolites exchanged with ∼5.2 wt% of V, Cr, Mn, Cu or Zn. n-C 16 was selected to realize intimate contact to the metal cations inside the zeolitic channels. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) indicated retaining high crystallinity of the catalysts incorporating the current metals. Moreover, the UV-vis spectra indicated that the current-exchanged metals are present as isolated species. Application of the Langmuir-Hinshelwood kinetics admitted calculating the photocatalytic degradation rate constant, k, and the adsorption coefficient, K ad , for the photodegradation of n-hexadecane, which have been found to correlate with atomic weights of the metals and their active cationic surface area. The MOR containing catalysts exhibited a reversed behaviour of k and K ad , compared to those containing ZSM-5 and Y zeolites. However, K ad seems to be correlated well with the active surface area of the metal cations.