Tailoring the stability of Ni-Fe/mayenite in methane – Carbon dioxide reforming

Highly dispersed Ni-based catalysts derived from the LaNiO3 perovskite for dry methane reforming: promotional effect of the Ni0–Ni2+ dipole inlaid on the support

“…Moreover, the lattice fringes adjacent to La 2 NiO 4 with an interplanar distance of 0.318 nm corresponds to the La(OH) 3 (101) plane. 14,40,41 By inference, the Ni species migrated to the surface of the catalyst during the reduction process of the LaNiO 3 perovskite. The transition layer of La 2 NiO 4 is formed between metallic Ni 0 and the La(OH) 3 support.…”

“…Moreover, the lattice fringes adjacent to La 2 NiO 4 with an interplanar distance of 0.318 nm corresponds to the La(OH) 3 (101) plane. 14,40,41 By inference, the Ni species migrated to the surface of the catalyst during the shows the deconvolution results of the La 3d 5/2 XPS spectra for R-LNO-CA, R-LNO-CAE and R-LNO-CO, in which four distinguishable peaks with binding energies from 830 to 845 eV are obtained. [42][43][44] The peak at around 832.50 eV can be allocated to the bond of La-O (indicated in red).…”

“…6(d). 41,48 The green region represents the 2p 1/2 peak of Ni 0 and the blue region corresponds to the 2p 1/2 peak of Ni 2+ . For the satellite peaks, the 2p 1/2 peak of Ni 2+ is observed between 872.34 and 872.98 eV (indicated in purple) and the 2p 3/2 satellite peak of Ni 0 is observed between 860.93 and 861.64 eV (indicated in red).…”

Ru-promoted perovskites as effective redox catalysts for CO2 splitting and methane partial oxidation in a cyclic redox scheme

“…20,23 Iron/iron oxide redox pairs are commonly used as the redox catalyst. [25][26][27][28][29][30][31][32][33] However, studies have shown that they generally lead to low syngas selectivity and CO 2 conversion. 25,34,35 On the other hand, mixing Fe with other metal oxides has been shown to improve redox properties.…”

Effect of Ce doping on the catalytic performance of xNiCeOy@SiO2 catalysts for dry reforming of methane

“…To improve the stability and the reaction activity of the catalyst, many solutions have been proposed, including addition of second metal as a promoter, 10,11 introduction of defects on the surface of the metal catalyst, 12 and encapsulation of metal nanoparticles into porous supports with core–shell structure. Zhang et al 13 prepared a series of Ni@SiO 2 catalysts calcined at different temperatures using the microemulsion method, and through precisely adjusting the size of the nickel particles and optimizing the interaction strength between the active species and the support, the DRM performance and stability of the catalysts were significantly improved.…”