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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of triangular [RhM"2cp"3(CO)"n] clusters (M = Ni, n = 2; M = Fe, n = 4; M = Mo, W, n = 6). [RhMo"2cp"3(CO)"6] as catalyst precursor in the CO hydrogenation reaction
    Amsterdam : Elsevier
    Inorganica Chimica Acta 156 (1989), S. 285-289 
    Details
    ISSN: 0020-1693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0020-1693(00)83514-8
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  • 2
    Electronic Resource
    Electronic Resource
    Metal dispersion dependent selectivities for syngas conversion on faujasite X hosted rhodium (1992)
    Springer
    Catalysis letters 13 (1992), S. 247-259 
    Details
    ISSN: 1572-879X
    Keywords: Faujasite X hosted rhodium ; rhodium particle size ; IR-spectroscopy ; TEM ; CO hydrogenation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Different metal dispersions of Na-faujasite X hosted rhodium were generated and characterized by transmission electron microscopy (TEM) and IR-spectroscopy. CO hydrogenation has been studied over these Rh/NaX-zeolite catalysts. The finer rhodium dispersion with a mean particle size of 1–2 nm shows a higher selectivity towards oxygenates (methanol, ethanol and dimethyl ether) as compared to the coarser dispersion (4–5 nm), where nearly exclusively methane and higher hydrocarbons are formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770997
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  • 3
    Electronic Resource
    Electronic Resource
    Relation between preparation, porosity and selectivity of CuO-ZnO-MeO x catalysts in the synthesis of alcohol mixtures (1992)
    Springer
    Catalysis letters 14 (1992), S. 185-195 
    Details
    ISSN: 1572-879X
    Keywords: CuO-ZnO-MeO x catalysts ; characterization by XRD ; DTA ; adsorption ; alcohol synthesis ; C2-C5-OH selectivity ; influence of porosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Some relations between the preparation of modified CuO-ZnO catalysts, their structural properties and their catalytic performance in the hydrogenation of carbon monoxide have been demonstrated. The different activities in the formation of higher alcohols have been attributed to an influence of the porosity on chain growth. The coupling or insertion of C1 intermediates seems to be favoured by an increasing surface coverage with C1 intermediates due to a transport limitation of methanol production. The pore size distribution of the catalysts has been varied by different calcination, thermal ageing, CuO/ZnO ratios, the method of promoting with Al2O3 and pelleting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00765232
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  • 4
    Electronic Resource
    Electronic Resource
    Solid-state ion exchange of rhodium chloride with highly dealuminated Y-type zeolite DAY by thermal treatment and in the presence of carbon monoxide (1994)
    Springer
    Catalysis letters 23 (1994), S. 215-226 
    Details
    ISSN: 1572-879X
    Keywords: Solid-state ; ion exchange ; dealuminated Y zeolite ; rhodium catalysts ; infrared ; spectroscopy ; Rh dicarbonyl ; acid hydroxyls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The solid-state ion exchange of Rh chloride with highly dealuminated Y zeolite has been studied by in situ FTIR spectroscopy. Thermal treatment in vacuum and calcination in oxygen up to 600°C results in an exchange limited to ca. 25% at temperatures higher than 400°C. The ion exchange can be performed much more effectively (over 50%) and at lower temperatures (100–150°C) in the presence of CO in the gas phase. A linear correlation has been found between the formation of well-defined Rh(CO) 2 + species and the simultaneous loss of acid hydroxyl groups for samples treated at different conditions. From these results a model is proposed with the formation of Rh subcarbonyls, the migration of these species to the cation positions of the zeolite and, finally, the formation of the stable well-defined Rh(CO) 2 + species at these positions as essential steps of the ion exchange in the presence of CO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811356
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  • 5
    Electronic Resource
    Electronic Resource
    In situ FTIR spectroscopy on rhodium-exchanged NaX zeolite with different metal dispersion during syngas reaction (1994)
    Springer
    Catalysis letters 27 (1994), S. 119-130 
    Details
    ISSN: 1572-879X
    Keywords: faujasite-hosted rhodium ; in situ FTIR spectroscopy ; CO hydrogenation ; rhodium dispersion ; methanol selectivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In situ FTIR spectroscopy has been applied to study the reason of the different selectivity behaviour of rhodium in the CO hydrogenation reaction in dependence on the different particle size. Several forms of molecularly adsorbed CO are observed, such as linearly- and bridgedbonded CO on metallic rhodium as well as dicarbonyl species with Rh(I) centres formed by oxidation of Rh(0) with protons in presence of CO. Furthermore, non-reactive formate, acetate, and carbonate species are produced as side products of the reaction. The higher selectivity to oxygenates, particularly to methanol, is explained by the existence of multiple-bonded CO present only on small rhodium crystallites. The multiple-bonded CO formed at low temperatures is converted at higher temperatures to the highly reactive formyl species, which is hydrogenated to methanol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806985
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  • 6
    Electronic Resource
    Electronic Resource
    IR-spectroscopic investigation of the adsorption of co on Rh supported on basic carriers MgO and ZnO (1984)
    Springer
    Reaction kinetics and catalysis letters 26 (1984), S. 387-390 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract CO реагирует с Rh(III), нанесенном на MgO и ZnO при повышенных температурах (〉373 К), образуя геминальные дикарбонильные частицы Rh(CO)2 на поверхности. После восстановления водородом при 743 и 473 К, соответственно, доминирующими адсорбированными формами являются линейные и мостиковосвязанные CO на больших кристаллитах Rh. Это находится в пр=qoтивоположности с Rh на других носителях, таких как Al2O3, SiO2 и т.д.
    Notes: Abstract CO reacts with Rh(III) supported on MgO and ZnO at elevated temperatures (〉373 K) to form the gem-dicarbonyl species Rh(CO)2 on the surface. After reduction with hydrogen at 743 and 473 K, respectively, the dominant adsorption forms are the linear and bridge bonded CO on larger Rh-crystallites. This is in contrast to Rh on other supports such as Al2O3, SiO2, etc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02067869
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  • 7
    Electronic Resource
    Electronic Resource
    Infrared study of the formation of surface isocyanate species in the reaction of NH3 and CO on supported Rh-catalysts (1983)
    Springer
    Reaction kinetics and catalysis letters 22 (1983), S. 221-225 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract С помощью метода ИК спектроскопии следили за образованием изоцианата из CO и NH3 на катализаторах Rh/Al2O3 и Rh/NaY. Изоцианат образуется также за счет реакции CO с координационно связанным аммиаком в виде [Rh(NH3)5Cl]2+/NaY.
    Notes: Abstract The formation of isocyanate from CO and NH3 on Rh/Al2O3 and Rh/NaY catalysts under various conditions was obtained using IR-transmission spectroscopy. Isocyanate is also formed by the reaction of CO with NH3 coordinatively bound as [Rh(NH3)5Cl]2+NaY.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064836
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  • 8
    Electronic Resource
    Electronic Resource
    Silane. IV. Alkalische Solvolyse von p-substituierten Dimethyl-phenyl-silanen (1963)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 325 (1963), S. 175-180 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Specific rate constants of the alkaline solvolysis of p-substituted dimethyl-phenyl silanes in ethanol/water are determined and compared with former results of correspondingly substituted triphenyl silanes. The inductive and mesomeric effect of the aryl group on the reaction velocity are estimated.
    Notes: Es werden die spezifischen Geschwindigkeitskonstanten der alkalischen Solvolyse von p-substituierten Dimethyl-phenyl-silanen in Äthanol/Wasser gemessen und mit früheren Ergebnissen an entsprechend substituierten Triphenyl-silanen verglichen. Induktiver und mesomerer Effekt der Aryl-Gruppe auf die Reaktionsgeschwindigkeit werden abgeschätzt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19633250310
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  • 9
    Electronic Resource
    Electronic Resource
    Strukturuntersuchungen an Cr2O3-Mischoxidkatalysatoren. IV. Zum System MgO—Cr2O3Professor Günther Rienäcker zum 65. Geburtstage am 13. Mai 1969 gewidmet (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 366 (1969), S. 240-248 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The phase composition of MgO/Cr2O3 mixed oxides prepared at various temperatures was investigated by chemical analysis, X-ray, IR-spectroscopic, and ESR measurements. The order of spinel phase increases with increasing temperature of preparation. No intermediate disordered structure was observed.
    Notes: Die Phasenzusammensetzung von MgO/Cr2O3-Mischoxiden, die bei verschiedenen Temperaturen hergestellt worden sind, wird durch chemische Analyse, röntgenographische, IR-spektroskopische und ESR-Messungen ermittelt. Die Ordnung innerhalb der sich bildenden Spinellphase wächst mit zunehmender Herstellungstemperatur. Ungeordnete Übergangsphasen wurden nicht beobachtet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693660315
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Rolle der Bindungsstärke in der heterogenen KatalyseProfessor Walter Rüdorff zum 60. Geburtstage am 3. Oktober 1969 gewidmet (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 369 (1969), S. 198-207 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The bonding strength between a substrate molecule and a solid surface on chemisorption determines whether a catalytic process results or a compound is formed between substrate and solid. For oxidation reactions RIENÄCKER and coworkers have shown that an optimum for the bonding strength of oxygen in oxides is a criterion for a good catalyst. This optimum can be determined by conductivity measurements.
    Notes: Die Stärke der Bindung zwischen Substratmolekel und Oberfläche bei der Chemisorption bestimmt, ob ein katalytischer Vorgang oder eine Verbindung zwischen Substrat und Festkörper resultiert. Für Oxydationsreaktionen wurde bereits 1955 erkannt, daß eine optimale Bindungsfestigkeit des Sauerstoffs in Oxiden das Kriterium einer guten katalytischen Aktivität ist. Dieses Optimum für den Bindungszustand des Sauerstoffs konnte durch Leitfähigkeitsmessungen näher charakterisiert werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693690310
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