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Showing papers on "Mesoporous material published in 1989"


Journal ArticleDOI
01 May 1989-Langmuir
TL;DR: Etude de l'adsorption de Xe sur le Vycor as mentioned in this paper, in order to mesurer the dimension and the structure of the pores of Xe.
Abstract: Etude de l'adsorption de Xe sur le Vycor afin de mesurer la dimension et la structure des pores

216 citations


Journal ArticleDOI
TL;DR: In this article, the authors examined the scope and limitations of physisorption as a means of characterising porous solids, and showed that the Brunauer-Emmett-Teller (BET) method remains the most useful means available for the determination of the surface area of mesoporous materials.

136 citations


Journal ArticleDOI
TL;DR: In this article, the formation of microporous texture and the previously established topotactic relation between γ-FeOOH and γ -Fe2O3 were investigated.

52 citations


Journal ArticleDOI
01 Jul 1989-Zeolites
TL;DR: In this article, a faujasite-type zeolite, US-CSZ-1, is shown to have mesopores of 10-20 nm diameter.

36 citations


Patent
William A. Wachter1
21 Sep 1989
TL;DR: In this paper, monodispersed mesoporous aluminosilicate matrix materials and their preparation are described and compared to other matrix materials with pore diameters between about 100 and 500 Angstroms and alumina contents between about 5 and 40 wt. %.
Abstract: Disclosed are monodispersed mesoporous aluminosilicate matrix materials and their preparation. The matrix materials have pore diameters between about 100 and 500 Angstroms and alumina contents between about 5 and 40 wt. %. Zeolites can be incorporated with the matrices to produce catalysts suitable for fluid catalytic cracking.

32 citations


Patent
William A. Wachter1
21 Sep 1989
TL;DR: In this article, a fluid catalytic cracking process employing a catalyst composition comprised of a monodispersed mesoporous aluminosilicate matrix material having pore diameters between about 100 and 500 Angstroms and alumina contents between about 5 and 40 wt.
Abstract: Disclosed is a fluid catalytic cracking process employing a catalyst composition comprised of a monodispersed mesoporous aluminosilicate matrix material having pore diameters between about 100 and 500 Angstroms and alumina contents between about 5 and 40 wt. %, and a crystalline zeolite.

29 citations


Journal ArticleDOI
01 Jan 1989-Carbon
TL;DR: In this paper, the porosity of graphitic matrices was studied and the surface area was determined by the BET (Brunauer-Emmett-Teller) procedure and the αs-method.

26 citations


Journal ArticleDOI
TL;DR: In this article, the triple point decrease of several gases was investigated using molecular sieves and porous glass exhibiting mesoporous systems with small ranges of pore diameters, observing the hysteresis shape of the adsorption isotherms.

1 citations


Journal ArticleDOI
TL;DR: In this paper, a domain model has been proposed for the gel networks to account for the observation of both macropores and mesopores as measured by Hg porosimetry and N2 desorption, respectively.
Abstract: Porous silica gelled from colloidal silica and potassium silicate mixtures as developed by Shoup has been investigated. Various gels exhibit an average pore size from 50 to 250 nm and a porosity up to 85%. Dealkalization by solution leaching is found to depend on the average pore size and is easier for large pore sizes. A domain model has been proposed for the gel networks to account for the observation of both macropores and mesopores as measured by Hg porosimetry and N2 desorption, respectively. The pore coarsening observed during sintering is explained by the material transport from areas around interdomain pores to those around intradomain pores in order to minimize the total surface energy.

Book ChapterDOI
01 Jan 1989
TL;DR: In this paper, a simple theory is presented to account qualitatively for these effects which are related to the optical birefringence of fibres containing some axially oriented pores.
Abstract: Sol-gel η-alumina fibres containing a proportion of axially-oriented pores have been compared with others containing only random porosity. The former fibres possess better mechanical properties. A simple theory is presented to account qualitatively for these effects which are related to the optical birefringence of fibres containing some axially oriented pores.