Characterization and reactivity of Re(x)/γ-Al2O3 catalysts in hydrodesulfurization and hydrodenitrogenation of gas oil: effect of Re loading

Unexpected Support Effect in Hydrotreating: Evidence of a Metallic Character for ReS2/Al2O3 and ReS2/SiO2 Catalysts

“…The major one attributed to ReS 2 has a binding energy at 41.7-41.9 eV for Re 4f 7/2 in agreement with previous published values [5,21]. The second contribution, with a binding energy Re 4f 7/2 circa 43.0 eV, was attributed to some oxy-rhenium sulfide species [22]. By analogy to molybdenum sulfide catalysts, such oxysulfide species must be associated to some S 2 2-entities.…”

Effect of the preparation of Re/γ-Al2O3 catalysts on the HDS and HDN of gas oil

“…The activity of the catalysts for simultaneous HDS and HDN of gas oil was measured in a high-pressure continuousflow micro-reactor operating at 598, 623 and 648 K, and 3 MPa total pressure, as described in detail earlier [10,11]. The feed was a commercial gas oil, boiling range of 491-654 K, density 0.856 g cm À3 (288 K), containing 4.700 mg L À1 of sulfur and 190 mg L À1 of nitrogen.…”

“…Later studies showed that Re sulfide catalysts supported on Al 2 O 3, SiO 2 or activated carbon were more active, between 2 and 20 times, in the HDS of thiophene than their Mo counterparts [8,9]. More recently, we found that Al 2 O 3 [10] and carbon-supported Re catalysts [11] were also highly active in the HDS and hydrodenitrogenation (HDN) of a commercial gas oil compared to supported Mo catalysts. Moreover, it was found that the improvement in HDS and HDN activity with Re loading was accompanied by a significant increase in the HDN/HDS selectivity for both Al 2 O 3 and activated carbon-supported catalysts.…”

Rhenium Nanochemistry for Catalyst Preparation

“…These catalysts have shown good activity in the hydrocarbon cracking and selective hydrogenation, hydrodesulfhurization of heavy crude oil and also selective dehydroaromatization of methane and ethane to benzene [4][5][6][7][8][9][10][11][12]. Applying a nanocomposite of Pt-Re alloy nanoparticles deposited onto TiO 2 OPEN ACCESS matrix it has been proven possible to transform tertiary amides into their corresponding amines using high pressure hydrogen atmosphere [13].…”