Showing papers on "Mesoporous material published in 1990"
Patent•
10 Dec 1990TL;DR: In this article, a new synthetic composition of ultra-large pore crystalline material and use thereof as sorbent and in catalytic conversion of organic and inorganic compounds was proposed.
Abstract: This invention relates to a new synthetic composition of ultra-large pore crystalline material and use thereof as sorbent and in catalytic conversion of organic and inorganic compounds. The new crystalline material exhibits unusually large sorption capacity demonstrated by its benzene adsorption capacity of greater than about 15 grams benzene/100 grams at 50 torr and 25° C., a hexagonal electron diffraction pattern that can be indexed with a d 100 value greater than about 18 Angstrom Units and a hexagonal arrangement of uniformly sized pores with a maximum perpendicular cross section of at least about 13 Angstrom units.
284 citations
Patent•
10 Dec 1990TL;DR: In this article, an improved method for synthesizing a new synthetic composition of ultra-large pore crystalline material which can be used as a sorbent or catalyst component for conversion of organic and inorganic compounds is described.
Abstract: This invention relates to an improved method for synthesizing a new synthetic composition of ultra-large pore crystalline material which can be used as a sorbent or catalyst component for conversion of organic and inorganic compounds. The crystalline material product of this method exhibits unusually large sorption capacity demonstrated by its benzene adsorption capacity of greater than about 15 grams benzene/100 grams at 50 torr and 25° C., and an arrangement of uniformly sized pores with a maximum perpendicular cross section of at least about 13 Angstrom units.
182 citations
Patent•
10 Dec 1990TL;DR: In this paper, a method for synthesizing a new synthetic composition of ultra-large pore crystalline material which can be used as a sorbent or catalyst component for conversion of organic and inorganic compounds is described.
Abstract: This invention relates to a method for synthesizing a new synthetic composition of ultra-large pore crystalline material which can be used as a sorbent or catalyst component for conversion of organic and inorganic compounds. The crystalline material product of this method exhibits unusually large sorption capacity demonstrated by its benzene adsorption capacity of greater than about 15 grams benzene/100 grams at 50 torr and 25° C., a hexagonal electron diffraction pattern that can be indexed with a d 100 value greater than about 18 Angstrom Units and a hexagonal arrangement of uniformly sized pores with a maximum perpendicular cross section of at least about 13 Angstrom units.
92 citations
45 citations
TL;DR: In this article, a series of mesoporous and macroporous silicas with a mean pore diameter (PD), between 6 and 200 nm were reacted with a copolymer of styrene and vinyl-methyldiethoxysilane.
40 citations
TL;DR: In this paper, the porosity of wet gels is represented by three levels of porosity, and the value of Young's modulus is found to decrease when the volume of macropores in the gel increases.
Abstract: The paper presents data obtained from thermoporometry and mechanical measurements on wet silica gels. The porous texture of wet gels is represented by three levels of porosity. Among the population of pores, only the mesoporous range has been completely characterised quantitatively. The value of Young's modulus is found to decrease when the volume of macropores in the gel increases. A simple mechanical model is presented and discussed to support this observation.
17 citations
TL;DR: In this article, two hydrous stannic oxides, prepared by metal oxidation with nitric acid and by acidification of sodium stannate, are microcrystalline, displaying certain differences in their infrared patterns.
15 citations
TL;DR: A series of five catalysts of NiO-Al2O3 of varying content (IA-VA) were prepared at pH ∼ 10 and dried at 80°C using neutral mesoporous alumina composed of μ-Al 2O3 and poorly crystalline boehmite.
Abstract: A series of five catalysts of NiO-Al2O3 of varying content (IA-VA) were prepared at pH ∼ 10 and dried at 80°C using neutral mesoporous alumina composed of μ-Al2O3 and poorly crystalline boehmite. Structural changes produced upon heat treatment up to 700° C were followed using XRD, TG and DTA techniques. The surface texture of the samples was investigated by nitrogen adsorption at 77 K. The effect of soaking period on the resulting preparation and on its thermally treated products was also investigated (III Aa).
9 citations
TL;DR: In this paper, the titania gels were prepared by hydrolysis of titanium alkoxides, using a micellar solution obtained from a non-ionic surfactant dissolved in a nonpolar solvent such as decane.
Abstract: The titania gels studied have been prepared by hydrolysis of titanium alkoxides, using a micellar solution obtained from a non-ionic surfactant dissolved in a non-polar solvent such as decane. The kinetic of the hydrolysis was controlled by the water exchange kinetics between reversed micelles. Two parameters, n and m , have been used to control the kinetic of gel growth and the texture of the final product. The parameter n is the water/surfactant molar ratio and m is the alkoxide molar concentration. Correlation between the variation of these two parameters and the mesoporous textural evolution have been investigated, using thermoporometry. Thermoporometry is a textural characterization method for porous materials, performed in a liquid medium. It appears to be a very appropriate method to characterize the mesoporous texture of wet gels. Although monolithic titania gels can be obtained in a large range of n and m values, thermoporometry results showed that kinetic parameters have to be precisely adjusted in order to achieve a homogeneous porous texture.
6 citations
TL;DR: In this article, the kinetics of self-diffusion and trace component diffusion of Cs + in hydrous stannic oxide heated at 50 and 400°C were studied.
5 citations
15 Mar 1990
TL;DR: In this article, the adsorption excess of a component from a binary nonelectrolytic liquid mixture on a porous solid is expressed as a simple sum of the adaption excesses referring to fine pores (micropores) and large pores (mesopores and macropores).
Abstract: The adsorption excess of a component from a binary nonelectrolytic liquid mixture on a porous solid is expressed as a simple sum of the adsorption excesses referring to fine pores (micropores) and large pores (mesopores and macropores). Because the energetic state of molecules adsorbed in the micropores differs from that of molecules adsorbed on the mesopore surface, a comparison of the excess adsorption isotherm on a porous solid with that measured on a reference nonporous solid permits evaluation of the adsorption capacities for the micropores and the mesopores. Experimental examples indicate that this comparative method is promising for studying adsorption from liquid mixtures on microporous solids such as microporous activated carbons.
TL;DR: In this paper, a two-dimensional network model for a heterogeneous material in which micro-porous particles are compacted so as to leave a mesoporous interparticle space has been constructed.
Abstract: A two-dimensional network model for a heterogeneous material in which «micro»-porous particles are compacted so as to leave a mesoporous interparticle space has been constructed. In this paper the model is used to study the transport of an adsorbable gas
TL;DR: Adsorption isotherms and relative permeabilities have been calculated for a previously studied two-dimensional model for a bidisperse macroheterogeneous porous material containing regions of microporosity embedded in a mesoporous network as discussed by the authors.
Abstract: Adsorption isotherms and relative permeabilities have been calculated for a previously studied two-dimensional model for a bidisperse macroheterogeneous porous material containing regions of microporosity embedded in a mesoporous network