Abstract
This note examines why the hydrogen uptake of nickel adsorbed on porous Vycor glass (Ni/PVG) varied peculiarly with changes in reduction conditions. The grain size of the PVG was 80-100 mesh. Its surface area and its pore diameter were determined by nitrogen adsorption to be 419 m{sup 2}/g and 2 nm, respectively. Nickel, 3.92 wt%, as metal adsorbed on PVG was washed with water and then was reduced by passing hydrogen at a rate of 100 cm{sup 3}/min in a quartz glass tube. Hydrogen uptake was measured at 298 K while keeping the pressure at 150 Torr (2). The BET surface area and the pore size distribution was then calculated from the nitrogen adsorption experiment. Crystallite size was measured directly from TEM micrographs. The amount of nickel dissolution was calculated from the concentration of nickel in the dilute nitric acid in which Ni/PVG was soaked for 2 days.
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