Hydrothermal stability of aluminum borate

Tsai, Max; Chen, Y. W.

doi:10.1007/bf00774724

Cited by 12 publications

(6 citation statements)

References 5 publications

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“…5, an absorption due to asymmetric B-0 stretches extends from 1260 cm-' (main maximum) to 1450 cm-' (shoulder).20 Tetrahedral borate species are instead characterized by complex absorptions due to asymmetric and symmetric BO, stretches in the region 1100-900 cm-1. 21,22 The bands due to trigonal and tetrahedral borate species have similar absolute intensities, as is deduced from the spectrum of borax, Na2B,0, . 10H20, shown in Fig.…”

supporting

confidence: 56%

Characterization of microporous amorphous alumina–boria

Delmastro¹,

Gozzelino²,

Mazza³

et al. 1992

J. Chem. Soc., Faraday Trans.

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Alumina-boria samples with B : (B + Al) 0-50 atom% have been prepared by an unconventional procedure consisting of the reductive decomposition of the mixture of nitrates in the presence of glycerol X-ray diffraction (XRD)-amorphous samples having surface areas of 380-470 m2 g-' were obtained after calcination at 673 K.Their thermal stability has been studied by differential thermal analysis (DTA) and XRD analysis, showing that crystallization occurred in all cases above 1150 K. FTlR data show the predominance of octahedral A13+ and triangular B3+ both in the bulk and on the surface. Correspondingly, all samples show lower catalytic activity in methanol dehydration compared with y-alumina. It was concluded that boron tends to hinder crystallization of amorphous alumina, to increase its surface area and to further decrease it surface acidity.

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supporting

confidence: 56%

Characterization of microporous amorphous alumina–boria

Delmastro¹,

Gozzelino²,

Mazza³

et al. 1992

J. Chem. Soc., Faraday Trans.

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“…For samples prepared by coprecipitation (generally H 3 BO 3 and Al(NO 3 ) 3 in the presence of ammonia), SSA increased [41][42][43]. Some studies [43,44] reported that APD decreased by a factor of ca. 2 upon introduction of B by coprecipitation.…”

Section: Texture Of B-al 2 O 3 Supportsmentioning

confidence: 99%

“…on boehmite), the SSA was often reported to decrease due to pore plugging by Bcontaining oxidic species [38][39][40]. For samples prepared by coprecipitation (generally H 3 BO 3 and Al(NO 3 ) 3 in the presence of ammonia), SSA increased [41][42][43]. Some studies [43,44] reported that APD decreased by a factor of ca.…”

Section: Texture Of B-al 2 O 3 Supportsmentioning

confidence: 99%

Characterization and hydrodesulfurization activity of CoMo catalysts supported on sol–gel prepared Al2O3

Dumeignil

Sato

Imamura

et al. 2005

Applied Catalysis A: General

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“…26 However, when aluminum borate with an Al to B ratio of 10 was treated with water steam at 750 °C for up to 48 h, the pore size distribution and the surface area of the aluminum borate changed. 27 This can be ascribed to the instability of the boron compounds.…”

Section: Superheated Steammentioning

confidence: 99%