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co oxidation and 4-nitrophenol reduction over ceria-promoted platinum nanoparticles impregnated with ZSM-5 zeolite

Journal of Rare Earths 2022年第8期40卷 1247-1254页

作者： Zeinhom M.El-Bahy Mohammed T.Alotaibi Salah M.El-Bahy Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City11884CairoEgypt Department of Chemistry Turabah University CollegeTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia

Active new ceria-promoted platinum supported on ZSM-5 catalysts were prepared and characterized by X-ray diffraction(XRD),Fourier transform infrared spectra(FTIR),transform electron microscopy(TEM),temperature programmed desorption(tpd),and FTIR of co *** samples were prepared by the incipient wetness impregnation method and calcined at 500℃.The XRD patterns and FTIR spectra prove that the zeolite framework is kept unaltered after metal *** images prove the presence of Pt nanoparticles with particle size starting from 14 to 27 *** FTIR data suggest the formation of Pt-O-Ce ***-situ FTIR of co adsorption over reduced samples proves the presence of Pt~0 only,and no Pt^(n+)-co species are *** prepared catalysts were tested in both oxidation reaction(co oxidation) in the gas phase and in reduction reaction(4-nitrophenol reduction) in the aqueous ***,co oxidation by O_(2) results in the formation of a co_(2) peak at 2347 cm^(-1) as the only co oxidation product in the studied frequency *** intensity of the co_(2) peak increases after the addition of Ce,and it is 4 times higher in Pt_(1) Ce_(0.5)ZSM-5 than that in the Ce-free *** to the FTIR data and previous reports,the increase in the catalytic activity may be due to the formation of Pt-O-Ce ***,Ce-promoted Pt_(1) ZSM5 also exhibits enhanced catalytic activity towards the reduction of 4-nitrophenol to 4-aminophenol by NaBH_(4) in the aqueous *** first-order rate constant of the reduction increases ≈13 times after incorporating equal ratios of Pt and Ce(Pt_(1) Ce_(1)ZSM-5),and the activation energy(E_(a)) decreases to 40% of that in the reaction over Pt_(1) ZSM-5.

关键词： 4-Nitrophenol co oxidation tpd-co Platinum-cerium ZSM-5 Rare earths

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Adsorption of co and NO on Ceria- and Pt-Supported TiO<sub>2</sub>: <i>In Situ</i>FTIR Study

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Modern Research in Catalysis 2013年第4期2卷 136-147页

作者： Zeinhom M. El-Bahy Chemistry Department Faculty of Science Taif University Taif Saudi Arabia

Pt/TiO2, Ce/TiO2 and binary system PtCe/TiO2 catalysts were prepared by impregnation method and the structural properties of these catalysts were investigated by means of XRD, co-tpd and UV-vis diffuse reflectance spectroscopy. As investigated by XRD, the composition of the prepared samples anatase and rutile phases with higher amount of anatase phase and its particle size was in the range of 19 - 22 nm. The band gap also decreased from 3.1 to 2.85 after addition of metal to TiO2. The adsorption and interaction properties of NO and/or co gases were monitored using an in situ FTIR technique. The intensity and position of the infrared peaks were strongly dependent on the composition of the catalyst. In presence of Pt, the main oxidative reductive products of (NO + co) are co2 and Nco complex. The formation of Nco depends on not only the presence of platinum in the catalyst but also the presence of Lewis acid sites which is Ti4+ in this study. However, the interaction between NO and co gases increased in presence of CeO2. The optimum Ce content in PtCe/TiO2 was 0.1% (Ce/TiO2) at which the maximum peak intensity was observed for Nco and co2.

关键词： In Situ FTIR NO Reduction co Oxidation tpd-co Platinum-Cerium

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