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N-Hexane Isomerization on Ni-Pt/Catalysts Supported on Mordenite

Modern Research in Catalysis 2013年第4期2卷 119-126页

作者： geovana S.V.Martins Everton R.f.dos Santos meiry g.f.rodrigues gina Pecchi Carlos M.N.Yoshioka Dilson Cardoso Chemical Engineering Department Federal University of Campina GrandeCatalysis Laboratory(LABNOV)Campina GrandeBrazil facultad de Ciencias Quimicas UniversidadConcepcionConcepcionChile Chemical Engineering Department Federal University of Sao CarlosCatalysis Laboratory(LabCat)Sao CarlosBrazil

The aim of this work was to evaluate the catalytic properties for n-hexane isomerization of bifunctional monometallic (Ni or Pt) and bimetallic catalysts (Pt-Ni), using HMOR zeolite as support. The method used for metal dispersion in the zeolite was competitive ion exchange using ammine complexes [Ni(NH3)6]Cl2 and [Pt(NH3)4]Cl2 as precursors. The catalysts were characterized by X-Ray diffraction, X-Ray energy dispersion spectroscopy, temperature-programmed reduction and transmission electron microscopy. The n-hexane isomerization reaction using the catalysts was carried out to evaluate the catalyst activity. The reaction was carried out in a fixed bed reactor operating at 250?C, 1 atm, H2/C6 = 9 molar ratio. The profiles obtained from TPR suggest that, for bimetallic catalysts, the presence of platinum facilitates the reduction of Ni2+ cations. The bimetallic catalysts presented a higher activity in the isomerization of n-hexane when compared to the monometallic ones, as well better stability as the Pt content in the solid increases.

关键词： N-Hexane Isomerization Mordenite Nickel Platinum

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Ruthenium promotion of Co/SBA-15 catalysts for fischer-Tropsch synthesis in slurry-phase reactors

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Journal of Natural gas Chemistry 2012年第6期21卷 722-728页

作者： Jocielys Jovelino rodrigues gina Pecchi fabiano AndrNarciso fernandes meiry glucia freire rodrigues federal University of Campina grande Academic Unit of Chemical Engineering facultad de Ciencias Químicas Departamento de Físico-QuímicaUniversidad de Concepción federal University of Ceara Department of Chemical Engineering

The aim of this work was to evaluate the catalytic properties of a Ru promoted Co/SBA-15 catalyst for fischer-Tropsch synthesis （fTS）. The Ru promoted Co/SBA-15 catalyst was prepared by wet impregnation method and was characterized by X-ray diffraction, X-ray energy dispersion spectrophotometer, N2 adsorption-desorption, temperature-programmed reduction and transmission electron microscopy. The fischer-Tropsch synthesis using the catalyst was carried out to evaluate the catalyst activity and its effect on fTS product distribution. The synthesis was carried out in a slurry reactor operating at 513 K, 20 atm, CO ： H2 molar ratio of 1 ： 1. X-ray diffraction showed that the calcined cobalt catalyst did not modify the structure of SBA-15, proving that Co was present in the form of Co3O4 in the catalyst. The addition of cobalt in SBA-15 decreased the specific superficial area of the molecular sieve. fischer-Tropsch synthesis activity and C5＋ hydrocarbon selectivity increased with the addition of Ru. The increases in activity and selectivity were attributed to the increased number of active sites resulting from higher reducibility and the synergetic effect of Ru and Co. Ru/Co/SBA-15 catalysts showed moderate conversion （40%） and high selectivity towards the production of C5＋（80 wt%）.

关键词： SBA-15 cobalt ruthenium heterogeneous catalyst slurry reactor fischer-Tropsch synthesis

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Adsorption of Zinc from Aqueous Solutions Using Modified Brazilian gray Clay

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American Journal of Analytical Chemistry 2013年第9期4卷 510-519页

作者： Patrícia N. M. Vasconcelos Wellington S. Lima Marta L. P. Silva André L. f. Brito Hervé M. Laborde meiry g. f. rodrigues federal University of Campina grande Academic Unit of Chemical Engineering Campina Grande Brasil Rural federal University of Semi Arid Agrotechnology and Social Science Departamento Mossoró Brasil

In this study, the removal of zinc (Zn2+) from aqueous solutions was investigated using a Na-enriched Brazilian gray clay. The mineral clays were characterized through EDX, XRD analysis and CEC. A finite bath system was used to evaluate the main effects of mechanical agitation (from 100 to 200 rpm), pH values in the range from 6.0 to 8.0 and Zn2+ initial concentrations (from 10 to 50 mg/L) on the removal process capacity. Langmuir and freundlich isotherm models were applied in order to determine the efficiency of clay used as an adsorbent. According to the obtained results, Langmuir model adjusts very well to the experimental data. Based on the kinetic studies for the Na-enriched gray clay, it was verified that the mechanism corresponds to a predominant pseudo-second order adsorption, presenting a kinetic constant value equal to k = 1.13 (***/mg).

关键词： Adsorption gray Mineral Clays Zinc Separation of Heavy Metal

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