Characterization and catalytic behavior of hydrotalcite-derived Ni–Al catalysts for methane decomposition

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.…”

“…In contrast, control over the particle size and metal distribution can be achieved by precipitation and the sol‐gel method. A study using NiAl mixed metal oxide (MMO) catalysts with various Ni molar ratios revealed that the catalyst prepared by co‐precipitation exhibits smaller particles with a uniform size and higher metal dispersion, as well as mild MSI, 133,138 whereas an Al 2 O 3 ‐supported Ni catalyst prepared by impregnation exhibits agglomerated particles (Figure 8). The strong interaction between Ni and the Al 2 O 3 support in the catalyst prepared by co‐precipitation is thought to prevent the agglomeration of Ni to large particles.…”

Direct Amination of Biomass‐based Furfuryl Alcohol and 5‐(Aminomethyl)‐2‐furanmethanol with NH3 over Hydrotalcite‐derived Nickel Catalysts via the Hydrogen‐borrowing Strategy

“…As depicted in Figure 3 peak was present at 869.6 eV, with a weak satellite peak at 875.1 eV, representing a typical mixture of core level and satellite features for metallic Ni, which indicated that the Ni species was completely reduced to Ni 0 . [32] The spent Ni 2 Al-600 presented a different spectrum than that of the freshly reduced sample. The Ni 2p 3/2 peak at 852.6 eV and Ni 2p 1/2 peak at 869.7 eV were assigned to the NiÀ N bond, suggesting that Ni 3 N was formed.…”

Catalytic methane decomposition to hydrogen and carbon over hydrotalcite‐derivative composition‐uniform and sintering‐resistant Ni‐Fe / Al 2 O 3 alloy catalysts

“…Ni-Fe-Al HTlcs were prepared by co-precipitation at room temperature. 35 In brief, a certain amount of nickel (II) nitrate hexahydrate, iron (III) nitrate nonahydrate, and aluminum (III) nitrate hexahydrate were dissolved in de-ionized water, and then added dropwise into an aqueous solution containing sodium carbonate under magnetic stirring. During the precipitation, the solution pH remained at 10 ± 0.5 by dropping a sodium hydroxide solution.…”