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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 104-108 
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 1695-1699 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 29 (1984), S. 745-753 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Adsorption von Benzol anα-Fe2O3- undγ-Al2O3-Pulvern bei Raumtemperatur wurde mittels Wärmefluß-Kalorimetrie und FT-IR-Spektroskopie untersucht. Beim Eisenoxid folgt auf dem Chemisorptions-Verbrennungs-Schritt ein bei Raumtemperatur reversibler, stark exothermer Adsorptionsschritt. Aluminiumoxid besitzt einige Oxydationszentren, sofern keine reduzierende Vorbehandlung erfolgt. Zwei aufeinanderfolgende reversible Adsorptionsschritte treten auf und werden der Wechselwirkung mit zwei verschiedenen Typen von Oberflächenhydroxylgruppen zugeschrieben.
    Abstract: Резюме Методом микрокалори метрии теплового пот ока и ИК спектроскопии с фу рье преобразованием исс ледована при комнатн ой температуре адсорбц ия бензола наα-Fe2O3 иγ-Аl2О3. В случае о киси железа стадия хемисорбция-горение сопровождалась последующей высокот емпературной стадие й адсорбции, обратимой при комнат ной температуре. На образцах окиси алю миния, не подвергнуты х предварительной обр аботке, существует нескольк о центров горения. Последовательно наб людались две обратим ые стадии адсорбции, кот орые были объяснены к ак результат взаимодей ствия с двумя различн ыми типами поверхностны х гидроксильных груп п.
    Notes: Abstract The adsorption of benzene at room temperature onα-Fe2O3 and onγ-Al2O3 powders was investigated by heat-flow microcalorimetry and FT-IR spectroscopy. On iron oxide a chemisorption-combustion step is followed by a highly exothermic adsorption step, reversible at r.t. Few combustion centres exist on alumina if reducing pretreatment is not carried out. Two reversible adsorption steps are subsequently observed and were interpreted as due to interaction with two different types of surface hydroxy groups.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 573-580 
    ISSN: 1572-8943
    Keywords: adsorption of water andn-heptane on paper ; BET theory ; compressibility factor ; microcalorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We have studied the geometry and energy involved in the interactions between adsorbed molecules and paper substrate, over a wide range of partial pressures. A two-dimensional virial equation of state was employed to evaluate the extent of interactions by the compressibility factor (Z). Data of H-bonded molecules (water and butan-1-ol) and of more weakly interacting ones (n-decane and dioxane) were selected from the literature. At low surface coverage, the compressibility factor Z exceeds 1, showing a deviation from ideality due to interactions, and reaches a maximum at a value close to the BET monolayer. As preliminary results we have measured by means of a differential microcalorimeter (Calvet) at 25
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 627-634 
    ISSN: 1572-8943
    Keywords: adsorption ofn-aliphatic alcohols on alumina ; microcalorimetry ; thermokinetic investigation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A differential microcalorimeter (E. Calvet) was used to study the processes of adsorption of five aliphatic alcohols (C1-C5) on α-Al2O3 at 25, 50, 100, 150 and 200°C. In particular, the importance of the thermokinetic study of the chemisorption of such alcohols at different experimental temperatures was demonstrated, with regard to the variations in the thermokinetic parameters (tmax, t1/2 and t0) and the evolution of the alcohol vapor pressure on the adsorbent during the adsorption process. It was concluded that: a) all the heat emission peaks of alcohol adsorption have the same rounded shape at 25°C; b) on passing from methanol to 1-pentanol, the area of the adsorption peaks increases as the chain length or molecular weight increases; c) on passing from 25 to 200°C, the shape of the adsorption peaks becomes more pointed.
    Type of Medium: Electronic Resource
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