Showing papers on "Mesoporous material published in 1987"
TL;DR: In this paper, the structure and adsorption properties of new carbon carriers obtained on the basis of carbon black have been examined, and the new material is of interest for fundamental studies of carbon-supported catalysts.
Abstract: Structure and adsorption properties of new carbon carriers obtained on the basis of carbon black have been examined. These carriers possess largely mesoporous structure, developed surface and high mechanical strength and contain hollow globules. Walls of these globules have pores, whose size is several hundreds A. The new material is of interest for fundamental studies of carbon-supported catalysts.
156 citations
TL;DR: In this article, the water-vapor adsorption isotherm for mesoporous active carbon is similar in shape to the adorption for nonporous graphitized carbon black and can be assigned to type III isotherms with a type H3 hysteresis loop.
Abstract: 1.
The water-vapor adsorption isotherm for mesoporous active carbon is similar in shape to the adsorption isotherm for nonporous graphitized carbon black and can be assigned to type III adsorption isotherms with a type H3 hysteresis loop.
2.
Volume filling of the adsorption space of the mesopores only takes place near the saturation pressure.
3.
Adsorption of water vapors on non-, meso-and microporous carbon adsorbents related to the amount of primary adsorption centers is satisfactorily described by a common curve similar to the isotherms of adsorption of water vapors on the adsorption centers of totally hydroxylated nonporous silica and silica gel.
3 citations
TL;DR: The pore volume filling in carbon adsorbents is a function of the ratio between the width of the slit pores and the surface concentration of primary adsorption sites, which is in turn determined by the average size of the crystallites which form the pore structure of the active carbons.
Abstract: 1.
The character of pore volume filling in carbon adsorbents is a function of the ratio between the width of the slit pores and the surface concentration of primary adsorption sites, which is in turn determined by the average size of the crystallites which form the pore structure of the active carbons.
2.
If the average distance between primary adsorption sites l is significantly less than the pore width 2x, clusters of associated water molecules form a continuous adsorption layer on the surface of the pores in active carbons. This process, which is characteristic of mesoporous active carbons with a high concentration of primary adsorption site, can be accompanied by polymolecular adsorption and volume pore filling according to a mechanism similar to capillary condensation.
3.
When l > 2x, confluence of the clusters formed on opposite walls of the pores is more probable. The pressure of the adsorbent at which confluence of the clusters takes place is determined by the pore size, and the adsorption value is proportional to the number of primary adsorption sites.