Characterization and Catalytic Activities of ZrO₂-TiO₂Supported Hydrodesulfurization Catalysts

Hydrotreating catalysts on different supports and its acid–base properties

“…Regardless of having basic nature, the alumina-zirconia support is 2.5-fold more active (measured as conversion of IPA) than AM support that is considered as basic support as well. The presence of ZrO 2 forms spherical aggregates of small particles and amorphous-like particles in tetragonal phases [26]. On the contrary, MgO is prone to dissolve during the preparation of the support that could influence on the alumina and magnesia interactions and its behavior during the reaction.…”

“…Choudhary and Akolekar [25] made a comparison of the nature of acid sites by studying the conversion of cumene, i-octane, and o-xylene over various materials with different silica content and found that i-octane cracking required strong acid sites, while o-xylene isomerization and cumene cracking were also catalyzed by weaker acid sites. Other studies in which cumene cracking is used to probe the acid-basic nature of supports and catalysts have been reported elsewhere [26][27][28].…”

TiO2-ZrO2 Binary Oxides for Effective Hydrodesulfurization Catalysts

“…However a very broad hump at 745-775 o C can be assigned to the transformation of phases, though not very distinct in our case [37]. The phase change delay to 800 o C could be related to the stabilization of titania matrix by zirconia and phase segregation between the two oxides might lead to delayed transformation [38]. No exothermic peaks due to ZrO 2 (indicating the presence of monoclinic and tetragonal phases) were observed indicating that the content of ZrO 2 is so less that it gets well embedded into the titania matrix and is so modified that it differs in behavior from that of the pure zirconia.…”