Nature of Ni-Al developed phases during thermal activation in relation to the preparation techniques. Part II: reduction and catalytic properties

The reducibility of different catalysts based on Ni (bulk and supported) us ed to obtain syngas is studied in. this work. Taking as test reaction the s team reforming of methane, it was possible to prove that the stability of c atalytic systems is closely related with the reduction temperature determin ed by TGA-DTG. Higher difficulty in reduction of metallic phase implies hig her interaction between Ni and Al oxides; this leads to higher stability of catalytic system exposed to severe thermal treatments. (C) 1999 Published by Elsevier Science B.V. All rights reserved.