Core-Shell Structured Ni@SiO2 Catalysts Exhibiting Excellent Catalytic Performance for Syngas Methanation Reactions

Abstract

Abstract:In this study, we prepared core-shell structured Ni@SiO 2 catalysts using chemical precipitation and modified Stöber methods. The obtained Ni@SiO 2 samples exhibited excellent catalysis performances, including high CO conversion of 99.0% and CH 4 yield of 89.8%. Moreover, Ni@SiO 2 exhibited excellent catalytic stability during a 100 h lifetime test, which was superior to that of the Ni/SiO 2 catalyst. The prepared samples were characterized using a series of techniques, and the results indicated that the catalytic performance for syngas methanation reaction of the Ni@SiO 2 sample was markedly improved owing to its nanoreactor structure. The strong interaction between the Ni core and the SiO 2 shell effectively restrained the growth of particles, and the deposition of C species.

Cobalt@Silica Core‐Shell Catalysts for Hydrogenation of CO/CO2 Mixtures to Methane

“…The control of the distribution is possible within certain limits by adjusting the synthesis parameters empirically. Han et al [16] developed a Ni@SiO 2 catalyst by a modified Stöber process and compared the core-shell catalyst with an impregnated catalyst for the methanation of CO exhibiting a superior activity. [9] A rather novel concept to overcome these limitations are the so-called core-shell catalysts, where an active metal core is encapsulated by a supporting porous shell.…”

“…While they found that an increase in the core size leads to a declining activity, they also encountered a rapid deactivation which they ascribe to a changing shell structure, i. e. a loss of mesopores and pore volume. Han et al [16] developed a Ni@SiO 2 catalyst by a modified Stöber process and compared the core-shell catalyst with an impregnated catalyst for the methanation of CO exhibiting a superior activity. Unfortunately, the authors do not account for the significantly different particle size, due to the different synthesis method, which greatly affects structuresensitive reactions.…”

Effect of decomposition of catalyst precursor on Ni/CeO2 activity for CO methanation

“…Significant efforts have been made toward preparation of Ni catalysts with enhanced carbon resistance and improved low-temperature activity. These efforts include but are not limited to the following: (1) limiting the catalyst size [4][5][6], (2) using structure-controlled preparation of the catalyst [6][7][8], (3) improving the Ni-support interaction [9,10], (4) using structured supporting materials [11,12], and (5) improving the support properties [13,14]. In fact, all these efforts aim at better control of the catalyst size and structure.…”

Large Specific Surface Area Macroporous Nanocast LaFe1−xNixO3: A Stable Catalyst for Catalytic Methane Dry Reforming

“…However, Ni-based catalysts tend to become deactivated when subjected to long-term reactions due to C deposition and the sintering of Ni grains. erefore, resistance to C deposition and prevention of Ni particle sintering must be studied [13,[16][17][18][19][20][21][22][23][24].…”