Enhanced Methanation over Aerogel NiCo/Al₂O₃Catalyst in a Magnetic Fluidized Bed

Abstract

CO methanation reaction over a nanosized NiCo aerogel catalyst (NiCo) for synthetic natural gas production was investigated in a magnetic fluidized bed (MFB) reactor. The results indicated that the NiCo catalyst showed poor fluidization behavior, while the fluidization quality of the catalyst can be greatly improved by introducing an axial uniform magnetic field. The catalyst in the MFB reactor afforded higher conversion of CO and higher selectivity and yield of CH 4 than those in the conventional fluidized bed, which was attributed to the MFB reactor improved gas−solid contract efficiency and inhibited axial back-mixing of the product gas. The catalytic performance in the MFB reactor was quite stable during a 100 h reaction. Such good stability is attributed to the superior property of the catalyst and the improved gas−solid contact efficiency in the MFB reactor. Furthermore, the particle agglomeration was inhibited when the catalyst was explored to a magnetic assisted fluidized bed. The combination of magnetic nanosized catalyst and MFB intensification as a promising route was developed for synthetic natural gas production.

Perfomances of different additives on NiO/γ-Al2O3 catalyst in CO methanation

“…But MgO would enhance the chemical interaction between the NiO and the supports, resulting in a new formation of NiO-Al 2 O 3 -MgO catalyst, which was not easy to be reduced [10]. Jun et al [11] developed a Ni-Co bimetallic aerogel catalyst prepared by a sol-gel method for the production of SNG via CO methanation. The catalyst exhibited higher conversion of CO, higher yield and selectivity of CH 4 .…”

CO methanation over a macro–mesoporous Al2O3 supported Ni catalyst in a fluidized bed reactor

“…31 Firstly, a 2.5 wt% NH 3 $H 2 O solution was added dropwise to a 0.18 mol L À1 Al 3+ solution with continuously and vigorously stirring at room temperature until the pH value reached 7.5 to form a hydrogel. 31 Firstly, a 2.5 wt% NH 3 $H 2 O solution was added dropwise to a 0.18 mol L À1 Al 3+ solution with continuously and vigorously stirring at room temperature until the pH value reached 7.5 to form a hydrogel.…”

Fluidization of Mixed SiO2 and TiO2 Nanoparticles with FCC Coarse Particles

“…Many methods were developed to improve the fluidization behavior of nanoparticles, for example, adding coarse particles to the bed [9][10][11] and introducing a magnetic field [12][13][14], acoustic field [15,16], or vibrating field [17][18][19]. Contrasted with other methods, the advantage of adding coarse particles is that it is unnecessary to get additional equipment or devices.…”