Synthesis of MMoO4/SiO2 catalysts (M=Ni or Co) by a sol–gel route via silicon alkoxides

K-promoted NiMo catalysts supported on activated carbon for the hydrogenation reaction of CO to higher alcohols: Effect of support and active metal

“…Previous studies [29,30] have suggested that ␤-NiMoO 4 , which is only stable at high temperatures, shows better catalytic behavior than the ␣-phase. Recent studies [31,32] have shown that this phase can be stabilized, even at room temperature, in supported NiMoO 4 catalysts, while the relative amount of the ␣-and ␤-phase depends on the content of NiMoO 4 [33]. Therefore, the transition observed from the ␣-to the ␤-NiMoO 4 phase in the AC supported catalysts could be attributed to the stabilization of the latter on the surface of the support.…”

Oxidative dehydrogenation of -butane over nanostructured silica-supported NiMoO catalysts with low content of active phase

“…Besides that, other papers report that the b-phase could also be stabilised by supporting the NiMoO 4 on different carriers such as Al 2 O 3 [19,20], SiO 2 [21][22][23][24][25][26][27], activated carbon [28], or TiO 2 [29]. In this case, the catalytic performances are also influenced by the specific characteristics of the support and the dispersion of the active sites of the catalyst.…”

“…According to a different method, supported molybdate catalysts, including nickel molybdate, were prepared by refluxing aqueous solutions of the appropriate metal nitrate salt with ammonium molybdate in the presence of silica sol [24]. In a recent work [25], a sol-gel method via silicon alkoxides was developed for the preparation of silicasupported NiMoO 4 catalysts. A previous work [26] reports the preparation of the stoichiometric NiMoO 4 phase by direct precipitation of the active phase over the SiO 2 carrier.…”

Graphene supported NiMo catalyst: A promising novel hydrocracking catalyst

“…The XRD pattern of NMAS, GNS, and NMFG catalysts are displayed in Figure 3. As observed, two diffraction peaks that appeared at 2 θ of 46.4° and 66.2° can be attributed to alumina, 22,25‐29 whereas diffraction peaks located at 2 θ of 23.3°, 25.5°, 27.2°, and 33.6° are assigned to MoO 3 . Furthermore, the diffraction peaks observed at 2 θ of 37.3°, 43.4°, and 60.67° are attributed to NiO.…”

“…N 2 adsorption-desorption isotherms of the NMFG (∆) and NMAS (□) catalysts T A B L E 2 Acidity measurement of understudy support and catalysts the deactivation rate of catalyst during HDC process.The XRD pattern of NMAS, GNS, and NMFG catalysts are displayed inFigure 3. As observed, two diffraction peaks that appeared at 2 of 46.4 • and 66.2 • can be attributed to alumina,22,[25][26][27][28][29] whereas diffraction peaks located at 2 of 23.3 • , 25.5 • , 27.2 • , and 33.6 • are assigned to MoO 3 . Furthermore, the diffraction peaks observed at 2 of 37.3 • , 43.4 • , and 60.67 • are attributed to NiO.As shown inFigure 3, a prominent reflection at 2 of 26 • and a weak peak at 2 of 43 • can be assigned to the graphiticF I G U R E 3 XRD patterns of NMAS and sulfided NMFG catalysts carbon (planes 0 0 2 and 1 0 0, respectively).…”