Methanation of Carbon Dioxide Over Mesoporous Nickel–M–Alumina (M = Fe, Zr, Ni, Y, and Mg) Xerogel Catalysts: Effect of Second Metal

Abstract

Mesoporous nickel (35 wt%)-M (5 wt%)-alumina xerogel (denoted as 35Ni5MAX) catalysts with different second metal (M = Fe, Zr, Ni, Y, and Mg) were prepared by a single-step sol-gel method for use in the methane production from carbon dioxide and hydrogen. In the carbon dioxide methanation reaction, yield for CH 4 decreased in the order of 35Ni5FeAXThis indicated that the catalytic performance was greatly influenced by the identity of second metal in the carbon dioxide methanation reaction. Experimental results revealed that CO dissociation energy and metal-support interaction of the catalyst played key roles in determining the catalytic performance of 35Ni5MAX catalysts in the reaction. Among the catalysts tested, 35Ni5FeAX catalyst, which retained the most optimal CO dissociation energy and the weakest metalsupport interaction, exhibited the best catalytic performance in terms of conversion of CO 2 and yield for CH 4 .

Methanation of carbon dioxide over mesoporous Ni–Fe–Ru–Al2O3 xerogel catalysts: Effect of ruthenium content

“…Nickel, iron, and ruthenium contents in the 35Ni5FexRuAX catalysts determined by ICP-AES analyses were in good agreement with the designed values. All the 35Ni5FexRuAX catalysts exhibited high surface area, large pore volume, and large average pore diameter, in good agreement with the previous work [14]. The above results indicate that mesoporous nickel-iron-ruthenium-alumina xerogel catalysts were successfully prepared by a single-step sol-gel method as attempted in this work.…”

“…It has been reported that adsorption ability of a metal catalyst for carbon dioxide can be modulated by adding an appropriate second metal [14,30]. This implies that addition of ruthenium into nickel-iron-alumina xerogel catalyst might affect the catalytic Table 2 Catalytic performance of 35Ni5FexRuAX (x = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) catalysts for methane production from carbon dioxide and hydrogen obtained at 220 8C after a 10 hcatalytic reaction.…”

“…However, it is known that conventional nickel-based catalysts suffer from severe catalyst deactivation in the carbon dioxide methanation reaction, because nickel particles are sintered during the exothermic methanation reaction [13]. Recently, addition of second metals such as Fe, Zr, Y, and Mg has been attempted to enhance the stability and catalytic activity of mesoporous nickel-alumina xerogel catalyst in the methanation reaction [14]. It has been reported that addition of iron significantly improved the stability and activity of mesoporous nickel-alumina xerogel catalyst in the methanation of carbon dioxide.…”

Enhanced Catalytic Activity of Iron‐Promoted Nickel on γ‐Al2O3 Nanosheets for Carbon Dioxide Methanation

“…At high space‐velocities, catalysts such as Ni/Al 2 O 3 reach the maximum conversion only above 400–450 °C. Modification of the support and incorporation of a second metal promote the CO 2 conversion performance, but long‐term stability is still often an issue. Recently, other types of materials with enhanced catalytic performance have also been reported .…”

Mechanism of CO methanation on the Ni4/γ-Al2O3 and Ni3Fe/γ-Al2O3 catalysts: A density functional theory study

“…Hence, addition of a second metal, such as Sm, Ce, and Fe, has been performed to enhance the catalytic activity and stability of Ni-based catalysts for CO methanation reaction; the second metal can improve dispersion of the active metal and adjust the interaction between Ni and the support [19e23]. Hwang et al [20,21] prepared NieMealumina xerogel catalysts doped with a different second metal (M ¼ Fe, Ni, Co, Ce, and La) through solegel method; they found that the NiFeAX catalyst exhibited excellent catalytic performance for CO or CO 2 methanation at low reaction temperatures. Yi Cheng et al [22] found that bimetallic NieFe alloy was more active than traditional Ni-based catalysts for CO methanation.…”