Nature of Ni-Al developed phases during thermal activation in relation to the preparation techniques. Part I: calcination

In this work, the thermal activation of different catalytic systems based o n Ni (bulk and supported) was analyzed. These solids are used to obtain syn thesis gas from reforming of methane. The evolution of these systems during calcination in air atmosphere was studied by using differential thermal an alysis, thermogravimetry analysis and X-ray diffraction. Results obtained, allowed the determination of calcination temperatures necessary for decompo sition of precursors of active phases (for different prep aration methods) as well as definition of a route to obtain supported Ni catalysts via depos ition-precipitation with urea. (C) 1999 Published by Elsevier Science B.V. All rights reserved.