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Abstract  

Alkaline earth metal (Mg, Ca, Sr and Ba) ions were exchanged into Hβ zeolite, which were used as the supports to load the noble metal Pt to prepare bifunctional catalysts for hydroisomerization of n-heptane. The catalysts were characterized by ICP, XRD, BET, NH3-TPD, H2-TPR and H2-chemisorption techniques, and evaluated in an atmospheric fixed bed reactor. The catalysts promoted by the alkaline earth metals are revealed to present much higher selectivity to isomerization than the counterpart Pt/Hβ. Moreover, the Ba-bearing catalyst loaded with 0.4 wt% Pt and 5:1 molar ratio of Ba to Pt gives a very high selectivity to iso-heptanes 95.4% with a considerable high conversion of n-heptane 61.7%. The promotion effect of alkaline earth metals is briefly discussed in relation to characterization data.

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second metal such as Au, Ag, and Pt, as an interesting catalytic system, have shown excellent performance for hydrodearomatization [ 14 – 16 ], hydrodesulfurization [ 17 ], and so on [ 18 ]. In addition, the HDO of organooxygen compounds under industrial

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. Determination of anthropogenic input of Ru, Rh, Pd, Re, Os, Ir and Pt in soils along Austrian motorways by isotope dilution ICPMS. Sci. Tot. Environ. 325 . 145–154. Meisel T. Determination of

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Introduction We have demonstrated the potential of the method consisting in the oxidation of gold alloys to produce highly loaded gold catalysts [ 1 , 2 ]. More recently, we have patented a new process of elaboration of Pt

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– 15 ]. For instance, due to the narrow size of the pore aperture (4.6 × 5.7 Å), the Pt/ZSM-22 catalyst was shown to be very selective for the production of monobranched isomers. The skeletal isomerization of the n -alkene intermediates can only occur

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Reaction Kinetics, Mechanisms and Catalysis
Authors: Bianca V. Sousa, Karoline D. Brito, José J. N. Alves, Meiry G. F. Rodrigues, Carlos M. N. Yoshioka, and Dilson Cardoso

limiting one and the product distribution depends essentially on the acidity and pore structure of the acid solid [ 6 , 7 ]. The isomerization of n -hexane is reversible and has an energy of activation E act = 118 kJ/mol on the catalyst Pt

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Central European Geology
Authors: Bassey E. Ephraim, Barth N. Ekwueme, Mohssen Moazzen, and Monir Modjarrad

American Mineralogist 82 1019 1037 . M.A.H. Maboko 1997 P-T condition of metamorphism in the Wami River

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have better activity and ability to resist the carbon deposition [ 6 ]. Most authors preferred Rh catalyst, owing to its good activity and stability. But, from the perspective of relative price and availability, Pt is a reasonable compromise, and many

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(C 7 –C 9 ) is also very important because of the much higher octane number of the corresponding isoparaffins, wherein n -heptane is usually used as a model reactant for fundamental research [ 1 , 2 ]. Since the commercial bifunctional catalyst Pt

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Introduction In recent works, Pt, Rh, Ir, and their alloys have many technological applications: as a catalyst in the petroleum cracking industry; as a catalyst supported on alumina [ 1 ], on SiC; as a catalyst support in

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