Resumen
Wide-pore ZrO2-TiO2 (Zr/Ti = 30/70) was prepared by low-temperature (273 K) sol-gel technique followed by solvo-treatment. Higher surface area (Sg ∼ 340 m2 g-1) and porosity (Vp ∼ 0.8 cm3 g-1) were registered after solvo-treatment at 353 K (1 day) for samples calcined at 773 K. Wider pores (∼22 nm) but much lower Sg (∼80 m2 g-1) were observed when solvo-treatment was carried out at 513 K. Even larger pores with almost no additional Sg decrease were obtained by prolonging that stage. MoS2 catalysts supported on binary oxides solvo-treated at 353 K showed increased intrinsic activity (by a factor of ∼3.3) in dibenzothiophene hydrodesulfurization (593 K and 5.6 MPa), as to that impregnated on conventional ZrO2-TiO2 (at 2.8 Mo atoms nm-2). By itself, Mo sulfidability (as determined by XPS) seemed not to dictate the activity trends found. Surface Lewis acidity appeared to play a decisive role on HDS performance, probably by influencing both Mo sulfidability and dispersion. Highly-loaded catalysts (5.6 Mo atoms nm-2) had decreased activity, probably due to lower MoS2 dispersion. Additional characterization comprised chemical analysis (ICP), XRD, thermal analysis, acidity measurements (by pyridine FTIR) and UV-vis DRS. Tailoring ZrO 2-TiO2 texture, traditionally characterized by narrow micro-mesoporosity results promising in developing novel hydrotreating catalyst supports.
Idioma original | Inglés |
---|---|
Páginas (desde-hasta) | 131-139 |
Número de páginas | 9 |
Publicación | Catalysis Today |
Volumen | 98 |
N.º | 1-2 SPEC. ISS. |
DOI | |
Estado | Publicada - 24 nov. 2004 |
Publicado de forma externa | Sí |