Highly active MoS2 on wide-pore ZrO2–TiO2 mixed oxides

Abstract:

Wide-pore ZrO2–TiO2(Zr/Ti = 30/70) was prepared by low-temperature (273K) sol–gel technique followed by solvo-treatment. Higher surface area (Sg ∼ 340m2g−1) and porosity (Vp ∼ 0.8cm3g−1) were registered after solvo-treatment at 353K (1 day) for samples calcined at 773K. Wider pores (∼22nm) but much lower Sg (∼80m2g−1) were observed when solvo-treatment was carried out at 513K. Even larger pores with almost no additional Sg decrease were obtained by prolonging that stage. MoS2 catalysts supported on binary oxides solvo-treated at 353K showed increased intrinsic activity (by a factor of ∼3.3) in dibenzothiophene hydrodesulfurization (593K and 5.6MPa), as to that impregnated on conventional ZrO2–TiO2 (at 2.8Moatomsnm−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 …

Año de publicación:

2004

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Fuente:

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