Catalytic oxidation of 2-chlorophenol in confined channels of ZSM-48

Kuen Song Lin, H. Paul Wang

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19 Citations (Scopus)

Abstract

Experimentally, the formation of undesired heavy polycyclic aromatic hydrocarbons (PAHs) and chlorinated phenol byproducts in the supercritical water oxidation (SCWO) of 2-chlorophenol (2CP) catalyzed by CuO/ZSM-48 at 673 K was significantly reduced. The reduction was attributed to the byproduct shape selectivity of the confined ZSM-48 channels. Speciation of active copper species in ZSM-48 was studied by X-ray absorption near edge structural (XANES) and extended X-ray absorption fine structural (EXAFS) spectroscopies, which suggested the existence of (Cu3O2)n (nmax = 150, cross section of about 1.9 Å) clusters in the channels of ZSM-48 (5.3-5.8 Å). The diffusion coefficients of the copper-oxide cluster (determined by low-temperature electron paramagnetic resonance (EPR) spectroscopy) were greater than that of the tight-fit 2CP in the channels of ZSM-48 by at least three orders. Since the catalytic SCWO of 2CP was extremely fast, we consider the possibility that copper-oxide clusters were relatively mobile if compared with the 2CP in the confined channels of ZSM-48.

Original languageEnglish
Pages (from-to)4956-4960
Number of pages5
JournalJournal of Physical Chemistry B
Volume105
Issue number21
DOIs
Publication statusPublished - 2002 May 31

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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