Preparation of MoO3/g-Al2O3 catalyst by the reaction of a-boehmite with MoO3/H2O slurry - dual role of MoO3 as active phase and texture stabilizer during calcination
Catalyst MoO3/g-Al2O3 was prepared by the reaction of a-boehmite with molybdic acid in slurry MoO3/H2O followed by calcination. The deposited MoO3 functioned as thermal stabilizer and inhibited sintering of Al2O3 phase during calcination. After calcination at 550 and 650oC the surface area of Al2O3 obtained from a-boehmite was 207 and 172 m2 g-1, respectively, and of MoO3/Al2O3 obtained from MoO3/a-boehmite was 323 and 285 m2 g-1, respectively. On the other hand, molybdic acid did not work as peptization agent and the mechanical strength of MoO3/Al2O3 was not higher than of Al2O3. The catalyst was sulfided and its activity in thiophene hydrodesulfurization was tested; it exhibited about the same activity as reference industrial MoO3/Al2O3 catalyst.
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