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Effect of hydrothermal treatment on the structure and acid properties of the surface of molded gamma-aluminum oxide

  • Inorganic Synthesis and Industrial Inorganic Chemistry
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Abstract

Mechanism of the hydrothermal modification of gamma-aluminum oxide was studied. A set of physicochemical methods demonstrated that boehmite crystals are formed in macropores (>500 nm) by the dissolution/precipitation mechanism, whereas in mesopores (<20 nm), rehydration of primary blocks of aluminum oxide occurs from the surface into the bulk. As a result of the phase transition, aggregates of primary oxide blocks are dispersed, which leads, at a certain treatment duration, to an increase in the specific surface area. In this case, the content of acid centers also increases according to the results of a temperature-programmed desorption of ammonia, as also does the catalytic activity in the reaction of skeletal isomerization of n-butenes.

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Authors and Affiliations

  1. Kazan (Volga Region) Federal University, ul. Kremlevskaya 18, Kazan, Tatarstan, 420000, Russia

    I. N. Mukhambetov & A. A. Lamberov

Authors
  1. I. N. Mukhambetov
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  2. A. A. Lamberov
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Correspondence to I. N. Mukhambetov.

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Original Russian Text © I.N. Mukhambetov, A.A. Lamberov, 2014, published in Zhurnal Prikladnoi Khimii, 2014, Vol. 87, No. 6, pp. 687–694.

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Mukhambetov, I.N., Lamberov, A.A. Effect of hydrothermal treatment on the structure and acid properties of the surface of molded gamma-aluminum oxide. Russ J Appl Chem 87, 676–683 (2014). https://doi.org/10.1134/S1070427214060020

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  • DOI: https://doi.org/10.1134/S1070427214060020

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