NiMo/MCM-41 Catalysts for the Hydrotreatment of Polychlorinated Biphenyls

MCM-41-supported vanadium catalysts structurally modified with Al or Zr for thiophene hydrodesulfurization

“…It can be also seen a shift of (100)-reflection towards lower 2θ values for the Al-modified supports, indicating an expansion of the structure, confirmed by the increment of pore wall thickness, lattice parameter and interplanar distance, as it can be seen in Table 2. Several authors have reported that the increased wall thickness is a strong evidence of metal incorporation into the MCM-41 framework [17,18,24]. On the contrary, Zr-containing materials showed a different behavior; the (100)-reflection was shifted to higher 2θ values with increasing Zr content.…”

“…Pure siliceous MCM-41 material was synthesized according to a previously published procedure [18]. In a typical experiment, NaOH was dissolved in deionized water and added to fumed SiO 2 , under magnetic agitation at 70 °C.…”

“…Al-and Zr-modified MCM-41 supports were prepared using the procedure in the same report [18]. Aluminum (III) isopropoxide or zirconium (IV) propoxide was dispersed in an isopropanol solution at about 70 °C.…”

“…On the other hand, just like in zeolites, the isomorphic substitution of M x+ ions (x = 3 + or 4 +) in the mesoporous silica frameworks, induces surface acidity [15,16] by generation of Brönsted type acid sites. The most of them are based on the Al-containing MCM-41-derivatives, which has been used as support for HDT catalysts [17,18]. Transition metal substituted MCM-41 by, e.g., Zr [19], Ti [20] or Nb [21] have been less studied than Al-containing MCM-41, but have shown some potential applications for hydrotreatment reactions.…”

Al2O3-MgO Supported Ni, Mo, and NiMo Mixed Phosphidic-Sulphidic Phase for Hydrotreating of Stearic and Oleic Acids Into Green Diesel

“…The Al 2 O 3 -MgO catalytic supports with an Al/Mg atomic ratio = 38 were prepared by modifying traditional sol-gel synthesis ( Puello-Polo et al, 2021 ; Méndez et al, 2013 ). In a typical experiment, appropriate amounts of aluminum (III) isopropylate {Al[OCH(CH 3 ) 2 ] 3 , 99.8%, Sigma- Aldrich} was dispersed in 50 ml of isopropanol [(CH 3 ) 2 CHOH, 98%, Sigma-Aldrich] under magnetic stirring at about 343 K until a homogeneous solution was obtained.…”