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  • 1
    Electronic Resource
    Electronic Resource
    Coke deposition on supported palladium catalysts (1996)
    Springer
    Catalysis letters 36 (1996), S. 37-39 
    Details
    ISSN: 1572-879X
    Keywords: coke deposition on palladium ; palladium catalyzed coking of cyclopentane ; coke deposition ; palladium catalyst
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Palladium/silica catalysts of varying dispersities were submitted to the coking reaction with cyclopentane at 500°C. Temperature programmed oxidation curves reveal the presence of two peaks for carbon deposition on the metallic function: the first one near 250°C would correspond to coke deposited on palladium atoms of high coordination and the second one near 400°C would involve palladium atoms of low coordination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807203
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization and activity of Pt-Sn/Al2O3 catalysts of different preparation: coimpregnation and new Pt-Sn precursor (1995)
    Springer
    Catalysis letters 31 (1995), S. 9-17 
    Details
    ISSN: 1572-879X
    Keywords: catalyst preparation ; alumina supported platinum-tin catalysts ; coimpregnation ; bimetallic precursor ; TPR ; cyclohexane dehydrogenation ; cyclopentane ring opening ; n-hexane skeletal reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new bimetallic Pt-Sn compound [Pt(NH3)4][SnCl6] has been used as precursor for the preparation of supported Pt-Sn/Al2O3 catalysts. A comparison of a dried sample with that prepared by coimpregnation displays different behaviour in TPR, chemisorption. The initial catalytic activity properties were checked in the reactions of cyclohexane dehydrogenation and cyclopentane ring opening, whilen-hexane skeletal reactions were used to probe the quasisteady-state activity. The catalyst prepared via the Pt-Sn complex precursors exhibited some-what lower specific activity. This fact, together with enhanced olefin formation fromn-hexane was taken as an indication of lower amount of contiguous Pt atoms and some electronic interaction between Pt and Sn in that catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00817028
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of chloride on sintering of Pt/Al2O3 catalysts (1991)
    Springer
    Catalysis letters 8 (1991), S. 327-333 
    Details
    ISSN: 1572-879X
    Keywords: Platinum ; alumina ; oxichloride ; oxidation ; sintering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Reduced Pt/Al2O3 catalysts with different chloride contents were treated at different temperatures under oxygen flow. TPR and TPD studies of oxidized species show that at low Cl/Pt atomic ratio (⩽1) PtO2 is formed at low temperature (400–500 K) and is totally decomposed (900 K) yielding reduced metallic Pt and inducing metal sintering. At high Cl/Pt atomic ratio (⩾6) formation of stable (up to 1000 K) platinum oxichloride avoids metal sintering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764194
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  • 4
    Electronic Resource
    Electronic Resource
    Coke deposits on Pt/Al2O3 catalysts of varying dispersities (1988)
    Springer
    Reaction kinetics and catalysis letters 37 (1988), S. 233-237 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Отложение сажи в реакции циклопентана исследовали на катализаторах Pt/Al2O3 с различной дисперсностью. Для всех изученных давлений, чем выще доступность металла, тем больше количество сажи, отложенной на катализаторе. Однако, сажа, отложенная на менее диспергированных катализатораш, более тксична длр функционирования металла. Повышенная доступность металла улучшает графитизацию сажи на носителе, тем самым предотвращая дезактивацию металла биф ункционального катализатора.
    Notes: Abstract Coke deposition during cyclopentane reaction was investigated on Pt/Al2O3 catalysts of varying dispersity. For all working pressures the higher the metallic accessibility, the higher the amount of coke deposited on the catalyst. Nevertheless, coke deposited on the less dispersed catalysts is more toxic for the metallic function. An increasing metal accessibility improves the graphitization of coke on the support and so, prevent the deactivation of the metal of a bifunctional catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02061739
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of the activation conditions on the catalytic properties of Pt/Al2O3 catalysts (1989)
    Springer
    Reaction kinetics and catalysis letters 38 (1989), S. 85-90 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Исследовали влияние условий активации катализаторов Pt/Al2O3 на гидрирование бензола и гидрогенолиз этана. Независимо от условий обжига или восстановления, удельные активности всех катализаторов в гидрировании бензола оказались постоянными. Однако, для гидрогенолиза этана, в идентичных дисперсиях обжиг в потоке мокрого аргона увеличивает удельную активность платины. Это свидетеляствует о важной роли предварительной мокрой обработки в образовании дефектов или в кристаллизации нанесенных металлических катализаторов.
    Notes: Abstract The effect of the activation conditions of Pt/Al2O3 catalysts has been investigated in the hydrogenation of benzene and in the hydrogenolysis of ethane. Whatever the conditions of calcination or reduction, specific activities of all catalysts for benzene hydrogenation remain constant. On the other hand, for identical dispersities, the cacination in a wet argon flow increases the specific activity of platinum for hydrogenolysis of ethane, pointing out the role of wet pretreatment on defect building or on the faceting of supported metallic catalysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02126257
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  • 6
    Electronic Resource
    Electronic Resource
    Structure sensitivity and coke formation on Pt/Al2O3 catalysts (1985)
    Springer
    Reaction kinetics and catalysis letters 28 (1985), S. 245-250 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Исследована начальная скорость образования угля в ходе реакции циклопентана на катализаторах Pt/Al2O3 с различной дисперсией металла. Показано, что высаждение кокса на металле является реакцией, чувствительной к структуре и протекающей предпочтительно на больших металлических частицах. С другой стороны, отложение углерода на всем катализаторе влияет на образование циклопентадиена и тем самым является реакцией, нечувствительной к структуре, т.к. начальная скорость отложения нагара на всем катализаторе прорциональна поверхности металла.
    Notes: Abstract The initial rate of carbon formation during cyclopentane reaction has been studied on different Pt/Al2O3 catalysts of varying metal dispersity. It has been shown that coke deposition on the metal is a structure sensitive reaction which is preferably produced on large metallic particles. On the other hand, coke deposition on the whole catalyst is relevant to cyclopentadiene formation and is a structure insensitive reaction since the initial rate of coke deposition on the whole catalyst is proportional to the metallic surface area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02062948
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  • 7
    Electronic Resource
    Electronic Resource
    Study of Supported Bimetallic Pd-Pt Catalysts. Characterization and Catalytic Activity for Toluene Hydrogenation (2000)
    Springer
    Reaction kinetics and catalysis letters 69 (2000), S. 209-216 
    Details
    ISSN: 1588-2837
    Keywords: Pd-Pt bimetallic catalysts ; toluene hydrogenation ; sulfur resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Bimetallic Pd-Pt catalysts were prepared either by a surface redox reaction (RC catalysts) or by coimpregnation (CI catalysts). RC bimetallic catalysts show a higher sulfur resistance in the course of toluene hydrogenation in the presence of thiophene compared to monometallic palladium and CI bimetallic catalysts. A characterization of the RC catalysts by IR and EXAFS allows to propose a structure of the Pd-Pt crystallites which would explain these results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005623127174
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  • 8
    Electronic Resource
    Electronic Resource
    Modifications of the electronic properties of Pt catalysts induced by sulfur adsorption or coke deposition (1986)
    Springer
    Reaction kinetics and catalysis letters 32 (1986), S. 269-274 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Конкурирующее гидрирование бензола и толуола на Pt использовали в тестировании модификации злектронных свойств металла за счет адсорбции серы или высаждений кокса на метелле. На основе измерений селективности оказалось, что адсорбция серы на платине индуцирует уменьшение злектронной плотности металла. Высаждение кокса приводит к противоположному эффекту.
    Notes: Abstract Competitive hydrogenation of benzene and toluene on Pt was used in order to test the modifications of the electronic properties induced by sulfur adsorption or coke deposition on the metal. From measurements of the selectivities, it appears that sulfur adsorption on platinum induces a decrease in the electron density of the metal. Coke deposition acts in the oppositeway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068322
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  • 9
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    Synthesis of cluster-derived PtFe/SiO2 catalysts for the oxidation of CO (2008)
    Elsevier
    Details
    Publication Date: 2008-04-25
    Print ISSN: 0021-9517
    Electronic ISSN: 1090-2694
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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  • 10
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    The chemistry of DeNOx reactions over Pt/Al2O3: The oxime route to N2 or N2O (2006)
    Elsevier
    Details
    Publication Date: 2006-10-25
    Print ISSN: 0021-9517
    Electronic ISSN: 1090-2694
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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