Active surface formation of tungstated zirconia catalysts for n-heptane isomerization

Synthesis and Characterization of Ni-WO3/Sulfated Zirconia Nano catalyst for Isomerization of N-Hexane and Iraqi Light Naphtha

“…On the other hand, no diffraction peaks assigned to NiO can be detected, meaning the metal promoters are well dispersed in the base and have a very small crystal size [14,15]. FTIR results of the study illustrated the absorption bands along the wavenumber 500-4000 Cm -1 , in which, the wavenumber of 500-600 Cm -1 corresponded to presence (Zr─O─Zr) bond, the wavenumber of (3300-3750) Cm -1 was corresponded to the presence the vibration of (O-H) bond, while, the absorption bond of SO 4…”

Reliable prediction of n-heptane isomerization over Pt/(CrOx/ZrO2)-HMS via comparative assessment of regularization networks and surface response methodologies

“…Due to the concern about the harmful effects of aromatics, many methods for the elimination of aromatic emissions have been established. [3][4][5][6] However, most of these methods are not suitable, especially in the case of gasoline, wherein the removal of these compounds causes a sharp drop in its octane number. Since the octane number of a fuel is a measure of its improved combustion, there is still a need to consider a suitable method.…”

“…Since the octane number of a fuel is a measure of its improved combustion, there is still a need to consider a suitable method. [3][4][5][6] One solution to tackle this problem is to replace these compounds with other friendly high-octane components, which would result in considerable energy saving. The isomerization process of straight-chain hydrocarbons is a proper way to produce high research octane number (RON) materials.…”

Mesoporous Ni–Cu/WOx/ZrO2 Catalyst with Highly Dispersed WOx Clusters: Efficient Catalysts for Selective Hydroisomerization of Isobutane to n-Butane

“…The introduction of tungsten oxide is beneficial to stabilize the tetragonal phase of zirconium dioxide at low temperatures (<800 °C). According to the previous reports of Smolikov et al and Cortés-Jácome et al, the replacement of Zr by W atoms causes an increase in the unit cell parameter c of the tetragonal lattice, increasing the unit cell volume of tetragonal ZrO 2 . , With a further increase in the F127/ZrO 2 molar ratio to 0.0017, three diffraction peaks of monoclinic ZrO 2 (28.2, 31.5, and 34.5°) were observed in the XRD patterns of 1Ni1Cu/mWZr-17 . For 1Ni1Cu/mWZr-17, the contents of tetragonal ZrO 2 and monoclinic ZrO 2 are 68.52 and 20.43%, respectively.…”

“…As shown in Table S1, the SSA (117.52–40.33 m 2 /g) and pore volume (0.26–0.11 cm 3 /g) of the catalysts decreased and the pore diameter (5.32–10.49 nm) of the catalysts increased with increasing calcination temperature from 650 to 850 °C. This is due to the coarsening of crystallites caused by the increase in the calcination temperature …”