Highly Loaded Mesoporous Ni–La2O3 Catalyst Prepared by Colloidal Solution Combustion Method for CO2 Methanation

Abstract

Highly dispersed Ni-based catalysts for CO2 methanation have been extensively studied over the last decade. However, a highly loaded Ni-based catalyst always results in a large Ni particle size and poor CO2 methanation activity. In this work, a colloidal solution combustion method was used to prepare a highly loaded Ni–La2O3 catalyst (50 wt % Ni) with a small Ni particle size and abundant metal–support interface. The characterizations demonstrated that a Ni–La2O3 catalyst prepared in this way has a mesoporous structure and a small Ni particle size. Due to the small Ni particle size and abundant metal–support interface, the highly loaded mesoporous Ni–La2O3 catalyst exhibits higher activity and selectivity in CO2 methanation compared to the Ni–La2O3 catalyst prepared by a conventional solution combustion method.

Encapsulated Ni@La2O3/SiO2 Catalyst with a One-Pot Method for the Dry Reforming of Methane

“…An average Ni particle size about 3.5 nm was obtained by counting more than 100 Ni particles as shown in Figure 2f. This result is consistent with our previous report of mesoporous Ni-La 2 O 3 prepared via colloidal solution combustion method [44].…”

“…Figure 1 shows the powder XRD patterns of the fresh and reduced catalysts. For the fresh Ni-La2O3/SiO2, the peaks at 2θ = 37.2°, 43.3°, and 62.9° are attributed to NiO [43,44]. The reduced Ni-La2O3/SiO2 showed weak Ni peaks at 44.5° and 51.7° [43,44].…”

“…For the fresh Ni-La2O3/SiO2, the peaks at 2θ = 37.2°, 43.3°, and 62.9° are attributed to NiO [43,44]. The reduced Ni-La2O3/SiO2 showed weak Ni peaks at 44.5° and 51.7° [43,44]. As shown in Table 1, the crystallite size of Ni in reduced Ni-La2O3/SiO2 is 16.4 nm, which is about twice that of NiO in fresh Ni-La2O3/SiO2.…”

火炎噴霧熱分解法により合成した多孔質ナノNiOを用いた80 wt% Ni–CeO₂触媒の調製とそのCO₂メタン化反応活性

“…Indeed, Ni/Al2O3 21) , Ni _ Al hydrotalcite 25) , and sponge Ni 26) suffer from minor formation of CO by-product ( 2 %). Moreover, approximately 50 wt% of small Ni particles were deposited on CeO2 via La2O3 doping 27) and formation of a mesoporous structure using an SiO2 template 28) .…”

Perovskite LaNiO3 Nanocrystals inside Mesostructured Cellular Foam Silica: High Catalytic Activity and Stability for CO2 Methanation

“…Noble metal catalysts are able to operate at lower temperatures than nickel catalysts, but their industrial applications have some limitations due to low reserve and high cost. Compared with noble metal catalysts, Ni‐based catalysts have been widely using different supports, and the most studied are Al 2 O 3 , CeO 2 , TiO 2 , CeO 2 ‐ZrO 2 , SiO 2 , and La 2 O 3 . However, these nickel catalysts usually suffer from a low catalytic activity at low temperatures and severe Ni sintering at high temperatures.…”