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  • 1985-1989  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Dispersity and reducibility of the molybdenum oxide phase in SiO2, SiO2−Al2O3 and γ-Al2O3 supported molybdena catalysts (1989)
    Springer
    Reaction kinetics and catalysis letters 38 (1989), S. 265-272 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Рентгено-дифракционные, изотермические и ТПР эксперименты проводили с катализаторами, нанесенными на SiO2, SiO2−Al2O3 и γ-Al2O3. Окись молибдена находится в более диспергированном состоянии на носителях, содержащих больше алюминия, и более восстанавливаема на SiO2−Al2O3 нежели на SiO2 или γ-Al2O3. Кривые ТПВ отражают связь между кинетикой реакции и дисперсией.
    Notes: Abstract XRD, isothermal and temperature-programmed reduction (TPR) experiments were carried out with SiO2, SiO2−Al2O3 and γ-Al2O3 supported catalysts. Molybdena is in a more disperse state on supports containing more alumina and it is more reducible on SiO2−Al2O3 than on SiO2 or γ-Al2O3. TPR curves were shown to reflect connections between reduction kinetics and dispersity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02062117
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  • 2
    Electronic Resource
    Electronic Resource
    Acidity of SiO2, SiO2−Al2O3 and γ-Al2O3 supports and supported molybdena catalysts (1989)
    Springer
    Reaction kinetics and catalysis letters 38 (1989), S. 273-279 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Кислотность носителей SiO2, γ-Al2O3 и SiO2−Al2O3, а также нанесенных катализаторов Mo в окисленном и восстановленом состояниях характеризовали ИК-спектро-скопическими и гравиметрическими измерениями адсорбции пиридина. Различия в поверхностных кислотностях объясняются различиями химического состава, взаимодействий молибдена с носителем и дисперсностью молибдена.
    Notes: Abstract Acidity of SiO2, γ-Al2O3 and SiO2−Al2O3 supports and supported Mo-catalysts in oxidized and reduced state are characterized by IR-spectroscopic and gravimetric pyridine (py) adsorption measurements. Differences in surface acidities are interpreted as results of differences in chemical compositions, molybdena-support interactions and molybdena dispersities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02062118
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  • 3
    Electronic Resource
    Electronic Resource
    PIGE and PIXE analyses of pentasil type boroaluminosilicates (1988)
    Springer
    Journal of radioanalytical and nuclear chemistry 120 (1988), S. 281-287 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The elemental composition of various synthetic crystalline sodium-boroaluminosilicates, especially the Al content and the silicon to aluminium bulk ratio, were determined by means of the combination of PIGE (Proton-Induced Gamma-Ray Emission Spectrometry) and PIXE (Proton-Induced X-Ray Emission Spectrometry). Light elements (B, O, Na, Al) were determined by means of gamma-ray emission. Proton-induced X-ray emission provided information on heavy elements present down to impurities. The Si/Al ratios, which mainly determine the catalytic and adsorptive properties of the zeolites, are compared with those obtained with other methods (EPMA, H2O sorption capacity) and show good agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037343
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  • 4
    Electronic Resource
    Electronic Resource
    Alkylierung und Umalkylierung von Aromaten an AlumosilicatenHerrn Prof. Dr. W. Pritzkow zum 60. Geburtstag gewidmet (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 717-723 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Alkylation and Transalkylation of Aromatics on AlumosilicatesThe alkylation of toluene (benzene) with methanol and the isomerization of metaxylene on alumina-silica and modified zeolites (HNaY, HM, HZSM-5) are acid-catalyzed proceed via a same intermediate. Except for the samples HZSM-5, the alkylation of toluene (benzene) can be explained by activity  -  selectivity  -  correlations.The referential diffusion of para-xylene in the channels of zeolithe ZSM-5 leads to a high product selectivity in alkylation and transalkylation reactions. Suggesting the supposition of a triangular reaction scheme.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300506
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  • 5
    Electronic Resource
    Electronic Resource
    Untersuchungen an oxidischen Katalysatoren. XLV. Umwandlung von Aromaten an dealuminierten ZSM-5-Zeolithen (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 563 (1988), S. 127-135 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Oxide Catalysts. XLV. Conversion of Aromatics on Dealuminated Zeolites ZSM-5The catalytic properties of zeolites ZSM-5 dealuminated by hydrochloric acid are investigated in the isomerization of m-Xylene, the disproportionation of toluene and in the alkylation of toluene with methanol. Besides the increase of the Si/Al ratio, the dealumination leads to an inversion of the Si/Al concentration gradient in crystallites, to a shift of acidity spectrum and consequently to a change in catalytic activity and selectivity.
    Notes: An säuredealuminierten HZSM-5-Proben werden die m-Xylen-Isomerisierung, die Toluendisproportionierung und die Toluenalkylierung mit Methanol untersucht. Die Säuredealuminierung bewirkt neben der Moduländerung eine Umkehr des Si/Al-Konzentrationsgradienten in den Zeolithkristalliten, eine Verschiebung des Aciditätsspektrums und damit eine Veränderung von Aktivität und Selektivität in den katalytischen Reaktionen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885630117
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen an oxidischen Katalysatoren. XLVI. Synthetische Boroalumosilicate mit Pentasilstruktur (SABO): Strukturelle, oberflächenchemische und katalytische EigenschaftenProfessor Ch. M. Minačew zum 80. Geburtstage am 24. Dezember 1988 gewidmet (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 566 (1988), S. 39-48 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Oxide Catalysts. XLVI. Synthetic Boroaluminosilicates with Pentasil Structure (SABO): Structural, Surface Chemical, and Catalytical PropertiesA remarkable modification of ZSM-5 type zeolites is possible by isomorphous substitution of silicon and/or aluminium by boron. In the H-forms of these SABO zeolites the boron atoms mainly exist in a trigonal lattice oxygen environment and hence they are not envolved in the formation of Broensted acid sites. Consequences of incorporated boron for catalytic reactions result from a decrease in the strength of existing Broensted sites as well as from a partial lattice contraction.
    Notes: Eine bemerkenswerte Modifizierung von Zeolithen des ZSM-5-Typs gelingt auf dem Wege der isomorphen Substitution von Silicium und/oder Aluminium durch Bor. In den H-Formen derartiger SABO-Zeolithe liegt Bor bevorzugt in trigonaler Gittersauerstoffkoordination vor und ist 30mit an der Bildung von Brönsted-Säurezentren nicht beteiligt. Konsequenzen eines isomorphen Boreinbaus für katalytische Reaktionen ergeben sich im wesentlichen aus einer Verringerung der Stärke vorhandener Brönsted-Zentren sowie aus einer mehr oder weniger starken Gitterkontraktion.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885660106
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  • 7
    Electronic Resource
    Electronic Resource
    Untersuchungen an oxidischen Katalysatoren. XLIV. Beeinflussung des katalytischen Verhaltens modifizierter Zeolithe vom Typ ZSM-5 durch thermische BehandlungProfessor Wolfgang Wieker zum 60. Geburtstage am 19. April 1987 gewidmet (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 547 (1987), S. 142-148 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Oxide Catalysts. XLIV. Modification of the Catalytic Behavior of Modified ZSM-5 Zeolites by Thermal TreatmentThe catalytic activity, the shape selectivity, and the deactivation behavior of ZSM-5 in paraffin cracking reactions can be regulated by a thermal pretreatment. A minimum of the deactivation rate as a function of zeolite pretreatment time at 600°C found in the hexane cracking could be verified in the methanol conversion reaction to gasoline.
    Notes: Die katalytische Aktivität, die Formselektivität und das Aktivität-Zeit-Verhalten des ZSM-5 beim Spalten von Paraffinen kann durch thermische Vorbehandlung stark beeinflußt werden. Ein in der Spaltung von Hexan gefundenes Minimum der Desaktivierungsgeschwindigkeit als Funktion der Dauer der Vorbehandlung bei 600°C konnte in der Methanolumwandlung zu Benzin verifiziert werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875470416
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen an oxidischen Katalysatoren. XLIII. Thermoanalytische und katalytische Untersuchungen an platinhaltigen H-ZSM-5-Zeolithen (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 531 (1985), S. 67-72 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Oxide Catalysts. XLIII. Thermoanalytic and Catalytic Investigations of Platinum-Containing Zeolites H-ZSM-5By impregnation with H2PtCl6 from ethanolic solution, after reduction a higher metal dispersion in zeolites Pt/H-ZSM-5 is achieved than by impregnation from aqueous solution. Over such samples, bifunctional catalyzed reactions are more favoured than over zeolites Pt/H-ZSM-5 obtained by impregnation with H2PtCl6 from aqueous solution.
    Notes: Das Auftränken von H2PtCl6 aus ethanolischer Lösung führt zu einer gegenüber dem Auftränken aus wäßriger Lösung disperseren Metallverteilung in Pt/H-ZSM-5-Zeolithen nach der Reduktion. An solchen Proben werden bifunktionell katalysierte Reaktionen stärker bevorzugt als an Pt/H-ZSM-5-Zeolithen, die durch Auftränken von H2PtCl6 aus wäßriger Lösung erhalten wurden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855311210
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  • 9
    Electronic Resource
    Electronic Resource
    Infrarotspektroskopische Untersuchung der Wechselwirkung Ni-haltiger Y-Zeolithe mit Kohlenmonoxid (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 539 (1986), S. 211-218 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: I.R.-Spectroscopic Investigation of the Interaction between Ni-containing Y-Zeolites and Carbon MonoxideBy the interaction of CO with reduced NiNaY or NiHY samples adsorbed CO on Ni2+ (2 215 cm-1) and on Ni+ (2 085 and 2 095 cm-1, respectively) and two species of adsorbed Ni(CO)4 are formed. Ni(CO)4 is produced in a slow, reversible reaction. Both species are in an equilibrium which is influenced by the acidity of the samples.
    Notes: Bei der Einwirkung von CO auf reduzierte NiNaY- und NiHY- Zeolithe beobachtet man adsorbiertes CO an Ni2+ (2 215 cm-1) und an Ni+ (2 085 bzw. 2 095 cm-1) sowie zwei Formen von adsorbiertem Ni(CO)4. Ni(CO)4 wird in einer langsamen, reversiblen Reaktion gebildet. Die beiden Formen stehen in einem durch die Acidität der Proben beeinflußten Gleichgewicht.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865390822
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