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  • 1
    Electronic Resource
    Electronic Resource
    Zur katalytischen Aktivität kationenausgetauschter Zeolithe des Typs X und Y (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 93-94 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01746755
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of template-free synthetic (B, Al) pentasil type zeolites (1992)
    Springer
    Reaction kinetics and catalysis letters 46 (1992), S. 271-278 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Синтезированые цеолиты типа пентазил, содержащие бор и не содержащие темплат, обладают структурными и каталитическими своиствами, подобными цеолиту SABO, приготовленному в присутствии н-пропиламина.
    Notes: Abstract Template-free synthetic, boron-containing pentasil type zeolites exhibit structural and catalytic properties similar to those of SABO zeolites made in the presence of n-propylamine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02070945
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  • 3
    Electronic Resource
    Electronic Resource
    On the reaction of aluminosilicates with aqueous solutions of NaOH and KF (1979)
    Springer
    Reaction kinetics and catalysis letters 11 (1979), S. 45-50 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Нейтрализация Н-морденита NaOH протекает по диффузионной кинетике, где ступенью, лимитирующей скорость процесса, является диффузия натриевых ионов в морденит. Кривые нейтрализации были определены с помощью ионообменной изотермы H3O+→Na+. С помощью раствора KF весь алюминий может быть экстрагирован из решетки цеолита NaY.
    Notes: Abstract Neutralization of H-mordenite with NaOH follows diffusion kinetics with the diffusion of sodium cations into the mordenite as rate-determining step; neutralization curves are determined by the H3O+→Na+ ion exchange isotherm. With KF solutions, all aluminium can be extracted from the lattice of NaY-zeolite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02098332
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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Isomerization of n-hexane over Pt/NH4NaY zeolite (1980)
    Springer
    Reaction kinetics and catalysis letters 13 (1980), S. 209-215 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Изомеризация н-гексана на Pt/NH4NaY описывается следующей реакционной схемой. Величины k1, k2 и kc линейно увеличиваются с увеличением степени обмена аммонийной группы в цеолите, а значительных изменений в селективности не наблюдалось. В течение активации Al частично удаляется из решетки с образованием HAlNaY.
    Notes: Abstract Isomerization of n-hexane over Pt/NH4NaY follows the reaction scheme k1, k2, kc linearly increase with increasing ammonia exchange degree in the zeolite and no significant changes in selectivity occur. During activation Al is partially removed from the lattice framework with the formation of HAlNaY.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068568
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  • 7
    Electronic Resource
    Electronic Resource
    On the acidic properties of H-SABO zeolites (1991)
    Springer
    Reaction kinetics and catalysis letters 43 (1991), S. 571-575 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Данные ТПДА, обработанные на ЭВМ, свидетельствуют об уменьшающейся силе центров Яронштэда и об ограничениях форсированной диффузии, вызванных встраиванием бора в позиции решетки цеолита пентазильного типа.
    Notes: Abstract Computer handling of TPAD data reveals a decreasing strength of Brönsted sites and forced diffusion limitations caused by incorporation of boron at pentasil type zeolite lattice positions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064730
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  • 8
    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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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Untersuchungen an oxidischen Katalysatoren. XXIX. Spektroskopische und katalytische Untersuchungen an Ni2+-, Co2+-, Cr3+- und Cu2+-ausgetauschten MordenitenProfessor Günther Rienäcker gewidmet (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 452 (1979), S. 6-16 
    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. XXIX. Spectroscopic and Catalytic Investigations on Ni2+-, Co2+-, Cr3+-, and Cu2+-exchanged MordenitesNiNaM, CoNaM, CrNaM und CuNaM (M = Mordenite) have been characterized by UV-VIS, EPR and i.r. spectroscopy and the results were compared with the catalytic activity and the activity-time-dependence in the cracking of n-octane and with the shape selectivity in the cracking of a n-octane and isooctane mixture. Water molecules acting as ligands of the exchanged cations are able to dissociate yielding Brönsted acidity. Brönsted sites may be regarded as catalytic active centers in the cracking reaction. Unreduced transition metal cations facilitate the “coking” of the mordenite.The unreduced chromium and cobalt cations for which a position within the main channel is expected, affect the diffusion of the branched paraffin molecule thus increasing shape selectivity.
    Notes: NiNaM, CoNaM, CrNaM und CuNaM (M = Mordenit) wurden durch UV-VIS-Spektroskopie, EPR- und IR-Untersuchungen charakterisiert und die erhaltenen Ergebnisse mit der katalytischen Aktivität und dem Aktivitäts-Zeit-Verhalten dieser Proben bei der Spaltung von n-Octan und der Formselektivität in der Spaltung eines Gemisches von n/iso-Octan verglichen. Wassermolekeln als Liganden der eingetauschten Kationen können dissoziieren und so einen Beitrag zur Brönsted-Acidität liefern. Die Brönsted-Zentren können als katalytisch aktive Zentren in der Spaltreaktion angesehen werden. Nichtreduzierte Übergangsmetallkationen vergrößern die Neigung des Mordenits zum „Verkoken“ wesentlich. Die nichtreduzierten Co2+- und Cr3+-Kationen, für die eine Position im Hauptkanal angenommen werden kann, wirken als zusätzliche Diffusionsbremse auf die verzweigte Paraffinmolekel und erhöhen die Formselektivität des Mordenits.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794520103
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