Influence of La on reduction behaviour and Ni metal surface area of Ni–Al2O3 catalysts for COx free H2 by catalytic decomposition of methane

Ni‐W Catalysts Supported on HZSM‐5/HMS for the Hydrogenation Reaction of Aromatic Compounds: Effect of Ni/W Ratio on Activity, Stability, and Kinetics

“…The band around 250 nm are ascribed to an absorption associated with a charge transfer transition of O 2− –Ni 2+ and O 2 –W 6+ for NiO and polytungstate species, respectively. A shoulder at above 300 nm is observed that it is associated with the d–d transitions of Ni 2+ and probably the bulk WO 3 phase and part of the octahedral coordinated tungsten species . The changes in the intensities of the bands in the supported Ni and Ni‐W oxide catalysts' spectra may be due to the differences in the interaction strength of species and their population on the supports.…”

Ni/H-ZSM-5 as a stable and promising catalyst for COx free H2 production by CH4 decomposition

“…The band at 1580 cm À1 (Gband) ascribed to the in-plane carbon-carbon stretching vibrations rather ordered structure carbon. 18,42,43 The degree of crystallinity of deposited carbon can be obtained from the frequency and intensity of Raman 'D' and 'G' bands. The ratio of peak area of the 'D' band to that of the 'G' band i.e.…”

Methane decomposition into CO x ‐free hydrogen over a Ni‐based catalyst: An overview

“…Catalyst performance is directly affected by the synthesis method, and the dispersion of metal particles on the support, particle size, and type of MSI considerably depend on the synthesis method. Synthesis methods that can produce an active and a stable Ni‐based catalyst for the CMD reaction include impregnation, 19,21‐23,60,77‐80,84,96,100,101,103,104,109‐111,114,127‐130 precipitation, 76,87,95,105,112,131‐134 and the sol‐gel method 67,68,94,97,108,116 . In addition, polyol reduction, 113,118,135 EISA, 85,115 fusion, 82 and emulsion 136 are employed.…”