Novel Fe-Pd/SiO2 catalytic materials for degradation of chlorinated organic compounds in waterстатья

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.

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[1] Novel fe-pd/sio2 catalytic materials for degradation of chlorinated organic compounds in water / L. M. Kustov, S. R. Al-Abed, J. Virkutyte et al. // Pure and Applied Chemistry. — 2014. — Vol. 86, no. 7. — P. 1141–1158. Novel reactive materials for catalytic degradation of chlorinated organic compounds in water at ambient conditions have been prepared on the basis of silica-supported Pd-Fe nanoparticles. Nanoscale Fe-Pd particles were synthesized inside porous silica supports using (NH4)(3)[Fe(C2O4)(3)] and [Pd(NH3)(4)]Cl-2 or Pd acetate as reaction precursors. According to temperature programmed reduction (TPR) studies, Pd introduction decreased the reduction temperature of the supported Fen+ species and nearly complete reduction with H-2 was observed at 400 degrees C. The successful surface loading with Pd was confirmed by X-ray photoelectron spectroscopy (XPS) analysis. Characterization of the samples by X-ray diffraction (XRD) and X-ray absorption near-edge structure + extended X-ray absorption fine structure (XANES + EXAFS) verified the presence of highly dispersed Pd-0, PdxFe1-x and Fe-0 phases. Reduction of the supported precursors in hydrogen resulted in materials that were highly active in perchloroethene (PCE) degradation and 2-chlorobiphenyl (2-ClBP) dechlorination. It was found that highly dispersed amorphous Fe-Pd bimetallic nanoparticles on silica support showed superior catalytic activity against PCE dechlorination in comparison to the free-standing Fe-Pd nanoparticles. For the samples with the same Fe content, the conversion of chlorinated organics as well as the stability increased with the Pd loading, e. g., the most effective degradation of PCEs and 2-ClBP was achieved at a Pd loading of 2.3-3.2 wt. %. [ DOI ]

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