Byproduct shape selectivity in supercritical water oxidation of 2-chlorophenol effected by CuO/ZSM-5

Kuen Song Lin, H. Paul Wang

研究成果: Article同行評審

39 引文 斯高帕斯(Scopus)

摘要

Reduction of trace polycyclic aromatic hydrocarbon (PAH) byproducts in supercritical water oxidation (SCWO) of 2-chlorophenol (2CP) effected by CuO/ZSM-5 has been investigated in the present work. In the channels of ZSM-5, due to a restricted environment, formation of undesired PAH byproducts in the SCWO of 2CP was significantly suppressed. Only trace light-PAHs with a molecular size less than 6 angstrom were formed in the SCWO of 2CP. Carcinogenic PAHs (heavy-PAHs) were not found. Structures of CuO and Cu2O in the channels of ZSM-5 that involved in the catalytic SCWO of 2CP were studied by X-ray photoelectron spectroscopy (XPS). The Cu2O-to-CuO ratio was approximately 0.15. Existence of the Cu(I) and Cu(II) was also confirmed by the preedge X-ray absorption near edge structural (XANES) spectroscopy. The copper oxides with a square-plane structure were observed by electron paramagnetic resonance (EPR) spectra. Furthermore, the extended X-ray absorption fine structural (EXAFS) spectra suggest that the copper oxides in the channels of ZSM-5 may form Cu3O2 clusters with Cu-Cu and Cu-O bond distances of 2.79 and 1.91 angstrom, respectively. The Cu3O2 clusters were oxidized to Cu3O4 by H2O2 in supercritical water.

原文English
頁(從 - 到)2627-2631
頁數5
期刊Langmuir
16
發行號6
DOIs
出版狀態Published - 2000 三月 21

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學
  • 表面和介面
  • 光譜
  • 電化學

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