Sur les renseignements apportés par l’analyse thermique différentielle dans l’étude des procédés d’obtention des catalyseurs

Trambouze, Yves; The, Tran Huu; Perrin, M.; Mathieu, Μ. V.

doi:10.1051/jcp/1954510425

Cited by 5 publications

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The dehydration of alumina trihydrate

Sato¹

1959

J. Appl. Chem.

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Thermobalance examination, differential thermal analysis and A-ray dillraction studies were made of the various alumina trihydrates prepared by seeding decomposition, auto-precipitation and decomposition b y passage of carbon dioxide into alkali aluminate solutions. lt was observed t h a t thermal decomposition of both hydrargillite and bayerite was of two types. The effect of the amount of hydrargillite and bayerite contained in the sample for dehydration and the effect of the particle sire were investigated. I t was concluded that dehydration of hydrargillite at about 300* is different from t h a t of bayerite, and that the particle size of the samples affects the type of thermal decomposition.I t is suggested that dehydration of alumina trihydrates proceeds by the follosving process :H ydrarg i Ili te-T--

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The dehydration of alumina trihydrate

Sato¹

1959

J. Appl. Chem.

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Simultaneous DTA and DTG measurements on aluminium oxide monohydroxides

Broersma

Bruyn

Geus

et al. 1978

Journal of Thermal Analysis

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Simultaneous DTA and DTG curves (Mettler TA-2) have been measured for one diaspore and four different boehmites at temperatures up to 750 co in a flow of dried argon. The crystallographic structures of the materials were assessed by X-ray diffraction and the degree of clustering of the elementary particles by scanning electron microscopy. To get straight base-lines a calibration curve was used to correct the DTA curves. The usefulness of the correction was established by comparison with DTA curves obtained with a Mettler TA-2000.The diaspore contained occluded water, Expulsion of the water at 300--350 ~ brought about fragmentation of the crystals. The DTA and DTG peaks that correspond to the dehydration to alumina both lie at 560 ~ .There is a noticeable spread in the DTA and DTG peaks for the different boehmites in the temperature range 455--530 ~ All the DTA peaks lie close to the corresponding DTG peaks. One of the boehmites displayed a double peak (470 ~ and 502~ To trace the origin of the variation in peak temperature, the porous structure of the boehmite having its peak at 530 ~ was varied by ball-milling and by dispersion into water, neither of which markedly affected the crystallographic structure and the crystallite size. Whereas ball-milling did not change the peak temperature much, dispersion into water brought about a transition from a single peak at 530 ~ to a double peak at 450 ~ and 490 ~ Prolonged storage in air led to a shift of the peaks to 480 ~ and 520 ~ It is concluded that the porous structure of boehmites can profoundly affect the appearance and the temperature of their dehydration peaks. 10'3. Thermal Anal 13, 1978

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Determination of Acidic Properties on Solid Surfaces

Tanabe

1970

Solid Acids and Bases

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Sur les renseignements apportés par l’analyse thermique différentielle dans l’étude des procédés d’obtention des catalyseurs

Cited by 5 publications

References 0 publications

The dehydration of alumina trihydrate

The dehydration of alumina trihydrate

Simultaneous DTA and DTG measurements on aluminium oxide monohydroxides

Determination of Acidic Properties on Solid Surfaces

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