Temperature-programmed reduction of Ni-Mo oxides

Low-Temperature Catalytic Performance of Ni-Cu/Al2O3 Catalysts for Gasoline Reforming to Produce Hydrogen Applied in Spark Ignition Engines

“…Thus we assigned the peak at 532˝C to the reduction of NiMoO 4 (the XRD data showed a NiMoO 4 peak); the latter peak could be assigned to the reduction of NiO interacting with MoO 3 . This result is consistent with a previous report [34]. Figure 7b shows the TPR of 18 wt.…”

“…It was reported that the presence of a Mo species impeded the incorporation of the Ni species into the lattice of alumina, thus preventing the growth of Ni particles, leading to less lattice expansion of alumina and highly dispersed Ni-Mo catalysts. This resulted in a weak metal-support interaction and, consequently, improved the reducibility of the catalysts [34,35,47]. Thus we assigned the peak at 532˝C to the reduction of NiMoO 4 (the XRD data showed a NiMoO 4 peak); the latter peak could be assigned to the reduction of NiO interacting with MoO 3 .…”

“…% Ni 0.5 -Mo 0.5 /Al 2 O 3 catalysts. The presence of the NiMo 4 phase was possibly due to the preparations of Ni-Mo catalysts [34,35]. surprising to note that the reflections of NiMo4 were observed over 18 wt.…”

“…% Ni0.5-Mo0.5/Al2O3 catalysts. The presence of the NiMo4 phase was possibly due to the preparations of Ni-Mo catalysts [34,35]. Figure 4 shows a scanning electron microscopy (SEM) micrograph of Ni0.5-Cu0.5/Al2O3 catalysts with various Ni-Cu content ratios; high distributions of CuO-NiO nanoparticles on large spongy clusters of γ-Al2O3 were observed for all the samples.…”

Evaluation of calcined hydrocalumite-type materials as supports of CoMo and NiMo for thiophene hydrodesulfuration reaction

“…It is worth mentioning that TPR peaks of alkali and alkali-earth metal molybdates appear at higher temperatures (usually above 700°C), and that they have been found to be incompletely reduced under the dynamic conditions of TPR at temperatures well in excess of 1000°C [18][19][20][21] . However, the presence of Ni and Co helps in attaining higher rates (TPR peaks at lower temperatures) and extents of reduction (more intense peaks) of these phases 22,23 . Finally, a wide signal between 800 and 1000°C could be a combination of the further reduction up to Mo metal of all molybdena containg phases plus that of the spinel-like phases of the promoters Co (and Ni) associated to the support.…”