Porous Structure of Catalyst Materials.

Catalyst Deactivation Due to Pore-Plugging by Reaction Products

“…The Maxwellian or log normal distributions are considered since the pore size distribution of some hydrodesulfurization catalysts can be approximated in this way (Debaun, et al, 1962). For a Gaussian distribution of pore sizes La(r) = Aa exp -ß2(^~-l) (9) \ro / r=r,,1-¿,l =2^( 10) 9a(r) = j 77-y2 • LG(r)dr (ID d is a parameter of sharpness for the distribution.…”

Pore Structure of Cracking Catalysts

“…These data show a marked pore size enlargement and broadening of the distribution with increasing pore volume. On a log probability scale (Figure 2) these samples exhibit a log-normal type of distribution (8), from which the surface area median Surface area distribution of 13% I, along with pore size distribution results for three high-alumina catalysts. Their structures are similar to those of lower alumina content.…”

“…The surface area and pore volume increments obtained from the Barrett-Joyner-Halenda calculation were divided by the pore diameter increment over which they were obtained and plotted against the average diameter for the given range. The distribution data for surface area and pore volume were plotted on a log-probability scale (8), from which the values for median pore size and 2 distribution width were taken. Differential Thermal Analysis.…”

Pore-size distributions of copper oxide-alumina catalysts

“…It is a colorless, mobile liquid, with a useful liquid range of over 200°C to its normal boiling point of 162°C , and it is miscible in all proportions with water. Some hydrated salts form anhydrous etherates when brought in contact with the ether (5). Considerable deviation from ideality is observed in density and viscosity data for water solutions of diethylene glycol dimethyl ether (7).…”