STRUCTURAL AND TEXTURAL PROPERTIES OF THE NIO-AL2O3 CATALYST

Influence of nickel oxide loading (5;10;20 wt% Ni) and temperature of heat treatment (400, 700, 1100 degrees C) on the structure, texture an d reducibility of coprecipitated NiO-Al2O3 catalyst was investigated. X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), low t emperature nitrogen adsorption (LTNA) and hydrogen reduction confirmed significant changes in physico-chemical properties as the function of mentioned variables. The results showed that the interactions in copr ecipitated NiO-Al2O3 system are intensive even at 400 degrees C. At 70 0 degrees C the observed interactions are accompanied by considerable changes in surface area, reducibility and the coordination of Ni(II), while at 1100 degrees C treatment intensive structural and textural ch anges were registered. (C) 1997 Elsevier Science Ltd.