2 research outputs found
\u201cMesoporous silica-allumina modified by acid leaching as support of Pt catalysts in HDS of model compounds\u201d
The potential of mesoporous silica\u2013alumina (MSA) modified by acid leaching as alternative support for
Pt catalysts was studied in hydrodesulfurization (HDS) of thiophene and benzothiophene. The supports
were characterized by N2 adsorption, XRD, 27AL MAS NMR, electron microscopy (SEM, HRTEM) and by
activities in cyclohexene isomerization and cumene cracking. The composition of the catalysts and Pt
dispersion were determined by ICP andH2 or CO sorption, respectively. Progressive leaching of the parent
MSA from 50% Al2O3 to 11% Al2O3 content led to increase of the BET surface area and exposition of strong
acidity. This positively affected the activities of the reduced Pt catalysts in thiophene HDS. Deposition of
1.5 wt.% Pt on MSA (11% Al2O3) by using Pt(NH3)4(OH)2 as precursor gave the best catalyst, several times
more active in thiophene HDS than the weight equivalents of sulfided CoMo/Al2O3 or reduced Pt/HY
zeolite. In benzothiophene reaction, its activity was slightly above that of CoMo/Al2O3 and about twofold
compared to Pt/HY