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  • 1
    Electronic Resource
    Electronic Resource
    Zum Einfluß der Präadsorption auf die Adsorption organischer Schwefelverbindungen an Molekularsieben (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 706-706 
    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/BF01550088
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  • 2
    Electronic Resource
    Electronic Resource
    A new synthetic layered silicate of type metal silicate hydrate (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 1071-1073 
    Details
    ISSN: 1435-1536
    Keywords: Layer silicates ; crystallization ; organic template ; x-ray and HREM investigation ; layer structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A new layered silicate has been synthesized in the quaternary system Na2O−SiO2−H2O-polymeric organic cation. The polymeric organic cation was intercalated into the silicate during crystallization. Composition, structure, and x-ray diffraction pattern of the new silicate do not fit with any known layered silicate [1–5]. Many similarities were found to hydrous alkali silicates (metal silicate hydrates, M-SH-type). The new silicate differs from M-SH by a high structural stability, against a wide range of different energetic influences. Due to the relatively high stability, high-resolution electron microscopy (HREM) can be applied to study the layer structure of this silicate as a representative of the M-SH silicates. All known M-SH, for example, magadiite and kenyaite are decomposed by the electronic beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657439
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Zum Zerfall von tert.-Butylhydroperoxid an Zeolithen (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 529-536 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Decomposition of tert.-Butyl Hydroperoxide by ZeolitesZeolites catalyze the decomposition of tert.-butyl hydroperoxide in the liquid-phase. Structure, cation and degree of ion-exchange influence the catalytic activity of the zeolithe. The highest rates of the decomposition were obtained by means of zeolites containing transition metal cations. It is possible to use the decomposition of tert.-butyl hydroperoxide, catalyzed by zeolites, for the epoxidation of olefins.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210402
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  • 5
    Electronic Resource
    Electronic Resource
    Die hydrothermale Kristallisation des Magadiits. 1. Die Kristallisationskinetik - Möglichkeiten ihrer Beschreibbarkeit (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 559 (1988), S. 191-200 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Hydrothermal Magadiite Crystallisation. 1. The Kinetic of the Crystallisation - Possibilities of their DescriptionThe topic of this paper is the synthesis of the sodium-silicate hydrate (Na—SH) magadiite within reaction mixtures of the ternary system Na2O · SiO2 · H2O. The crystallisation kinetics are studied and characterized by means of physical and chemical methods. As a result of this investigations a schematic model representation of the magadiit crystallisation is given.
    Notes: Gegenstand der Arbeit ist die Synthese des Natriumsilikathydrates (Na—SH) Magadiit im ternären System Na2O · SiO2 · H2O. Die Kinetik der Kristallisation wird verfolgt und durch physikalische und chemische Methoden charakterisiert. Auf Basis dieser Ergebnisse wird eine Modellvorstellung für die Kristallisation des Magadiits entwickelt und angegeben.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885590122
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  • 6
    Electronic Resource
    Electronic Resource
    Die Hydrothermale Kristallisation des Magadiits 2. Zur Umwandlung des HydrogelsProfessor Helmut Köhler in memoriam (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 600 (1991), S. 139-144 
    Details
    ISSN: 0044-2313
    Keywords: Magadiite ; hydrothermal crystallisation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Hydrothermal Magadiite Crystallization. 2. The Change of HydrogelThe synthesis of the sodium silicate hydrate (Na—SH) magadiite within reaction mixtures of the ternäry system Na2 · SiO2 · H2O and the changes of the hydrogel in the time of incubation are studied and characterized by means of physical and chemical methods. Two different phases of hydrogel exist.
    Notes: Die Synthese des Natriumsilicathydrates (Na—SH) Magadiit im ternären System Na2O · SiO2 · H2O und die Umwandlung des Hydrogels in der Inkubationsperiode wird durch physikalische und chemische Methoden untersucht. Es werden zwei unterschiedliche Hydrogelphasen nachgewiesen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19916000119
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  • 7
    Electronic Resource
    Electronic Resource
    29Si- und 23Na-Festkörper-MAS-NMR-Untersuchungen an Modifikationen des Na2Si2O5 (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 617 (1992), S. 169-177 
    Details
    ISSN: 0044-2313
    Keywords: Layered sodium silicates ; Disilicates ; Solidstate NMR ; Magic-angle spinning NMR ; 29Si MAS NMR ; 23Na MAS NMR ; Quadrupolar nuclei ; Line shape simulation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 29Si and 23Na Solid State MAS NMR Investigations of Modifications of the Sodium Phyllosilicate Na2Si2O5.The results of 29Si- and 23Na-MAS NMR investigations on four modifications of the synthetic Na2Si2O5 demonstrate that the α-, β- and δ-modifications are characterized unequivocally by the parameters of the corresponding NMR spectra. The studies on γ-Na2Si2O5 show that this sample contains a large amount of secondary compounds. For α- und β-Na2Si2O5 the the structural details of the silicate sheets are reflected by the 29Si MAS NMR spectra while from the 23Na MAS NMR spectra conclusions about the coordination number of the sodium atoms can be derived. The 29Si MAS NMR investigations on δ-Na2Si2O5 indicate that the silicate sheet of this modification consist of identical SiO4-tetrahydra the parameter of which differ from those of α- and β-Na2Si2O5. The 23Na MAS NMR studies show that in the interlayer space of δ-Na2Si2O5 two nonidentical sodium atoms exists. The NMR results give rise to the suggestion that one of the sodium is surrounded by five and the other one by six oxygen atoms.
    Notes: Die Ergebnisse von 29Si- und 23Na-MAS-NMR-Untersuchungen an vier Modifikationen des synthetischen Na2Si2O5 zeigen, daß sich die α-, β- und δ-Modifikationen eindeutig durch die Parameter ihrer NMR-Spektren voneinander unterscheiden lassen. Die Untersuchungen an γ-Na2Si2O5 weisen starke Verunreinigungen der Probe durch Nebenkomponenten nach. Für α- und β-Na2Si2O5 widerspiegeln die 29Si-MAS-NMR-Spektren die strukturellen Details der Silicatschichten, während sich aus den 23Na-MAS-NMR-Spektren Rückschlüsse auf die Koordinationszahl des Natriums ableiten lassen. Die 29Si-MAS-NMR-Untersuchungen an δ-Na2Si2O5 weisen darauf hin, daß die Silicatschicht in dieser Modifikation aus einheitlichen SiO4-Tetraedern aufgebaut ist, deren Strukturparameter sich jedoch von denen in α- und β-Na2Si2O5 unterscheiden. Die 23Na-MAS-NMR-Untersuchungen zeigen, daß in der Zwischenschicht des δ-Na2Si2O5 zwei nichtidentische Natriumatome existieren. Die NMR-Ergebnisse lassen vermuten, daß das eine Natriumatom fünffach, das andere sechsfach von Sauerstoffatomen koordiniert ist.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926170129
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Synthese von kristallinen Metallsilicathydraten mit Schichtstruktur (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 548 (1987), S. 204-216 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Crystalline Metal Silicate Hydrates of Layer StructureThe purpose of this paper is the synthesis of metal silicate hydrates by means of hydrothermal crystallization from the ternary systems M2/nO—SiO2—H2O (M = Li, Na, K, Ca, Mg). The prepared products, the sodium silicates ilerite, magadiite, and kenyaite and a potassium silicate hydrate, are species of crystallization sequences of a hydrothermal quartz formation process at low temperatures. The product sequences, obtained under different crystallization conditions are given and discussed.
    Notes: Gegenstand der Arbeit ist die Synthese von Metallsilicathydraten (M—SH) mit Schichtstruktur durch hydrothermale Kristallisation im ternären System M2/nO—SiO2—H2O (M = Li, Na, K, Ca, Mg). Die erhaltenen Produkte, die Natriumsilicathydrate Ilerit, Magadiit und Kenyait und ein Kaliumsilicathydrat sind Bestandteile von Produktfolgen im hydrothermalen Quarzbildungsprozeß bei niedrigen Temperaturen. Die Produktfolgen bei verschiedenen Kristallisationsbedingungen werden angegeben und diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875480523
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  • 9
    Electronic Resource
    Electronic Resource
    Hochauflösende Festkörper-NMR-Untersuchungen an Kieselsäuren. III Hochauflösende 29 Si-Festkörper-NMR-Untersuchungen an synthetischen siliciumreichen Kieselsäurehydraten (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 555 (1987), S. 129-142 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Solid-State High-Resolution N.M.R. Studies of Silicic Acids. III. Solid-State High-Resolution 29Si-N.M.R. Studies of Synthetic Highly Siliceous Silicic Acid HydratesSolid-state high-resolution 29Si-N.M.R. experiments were used to study the structure of the silicate layers in three synthetic highly siliceous silicic acid hydrates obtained by cation exchange reactions from the synthetic sodium silicate hydrates ilerite, magadiite and kenyaite. For each of the studied samples two well-separated N.M.R. signals have been recorded which could be assigned to Q3 - (O≡Si(OSi≡)3-) and Q4-(≡Si(OSi≡)4-) units of the silicate layers of the corresponding silicic acid hydrate. On the basis of these results the same model was used to describe the structure of the silicate layers in the studied compounds which has been already used for the interpretation of the N.M.R. results in case of the synthetic sodium silicate hydrates. Compared with the sodium silicate hydrates in the studied silicic acid hydrates a somewhat large Q4/Q3-ratio and a high-field shifted Q3signal have been detected. These observations were attributed to structural changes which appeared as a result of the cation exchange reactions.
    Notes: Hochauflösende 29Si-Festkörper-NMR-Experimente wurden zur Untersuchung des Aufbaus der Silicatschichten in drei siliciumreichen Kieselsäurehydraten eingesetzt, die durch Kationenaustauschreaktionen aus den synthetischen Natriumsilicathydraten Ilerit, Magadiit und Kenyait hergestellt wurden. Für jede der untersuchten Verbindungen wurden zwei deutlich getrennte Signale nachgewiesen, die den Q3 - (≡OSi(OSi≡)3-) und den Q4- (≡Si(OSi≡)4-) Baugruppen der Silicatschichten der entsprechenden Kieselsäurehydrate zugeordnet werden können. Auf Grund dieses Befundes wird zur Beschreibung der Struktur der Silicatschichten in den untersuchten Verbindungen das gleiche Modell herangezogen, das bereits für die Interpretation der NMR-Ergebnisse an den Natriumsilicathydraten benutzt wurde. Im Vergleich zu den Natriumsilicathydraten wird in den Kieselsäurehydraten ein etwas größeres Q4/Q3- Verhältnis und ein zu höherem Feld verschobenes Q3-Signal gefunden. Diese Befunde werden auf strukturelle Veränderungen zurückgeführt, die im Ergebnis des Kationenaustausches auftreten.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875551214
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