On the effect of yttrium promotion on Ni-layered double hydroxides-derived catalysts for hydrogenation of CO2 to methane

Abstract

Ni-containing mixed oxides derived from layered double hydroxides with various amounts of yttrium were synthesized by a co-precipitation method at constant pH and then obtained by thermal decomposition. The characterization techniques of XRD, elemental analysis, low-temperature N 2 sorption, H 2 -TPR, CO 2 -TPD, TGA and TPO were used on the studied catalysts. The catalytic activity of the catalysts was evaluated in the CO 2 methanation reaction performed at atmospheric pressure. The obtained results confirmed the formation of nano-sized mixed oxides after the thermal decomposition of hydrotalcites. The introduction of yttrium to Ni/Mg/Al layered double hydroxides led to a stronger interaction between nickel species and the matrix support and decreased nickel particle size as compared to the yttrium-free catalyst.The modification with Y (0.4 and 2 wt.%) had a positive effect on the catalytic performance in the moderate temperature region (250-300 °C), with CO 2 conversion increasing from 16 % for MO-0Y to 81% and 40% for MO-0.4Y and MO-2.0Y at 250 °C, respectively. The improved activity may be correlated with the increase of percentage of medium-strength basic sites, the stronger metal-support interaction, as well as decreased crystallite size of metallic nickel. High selectivity towards methane of 99% formation at 250 °C was registered for all the catalysts.

Ni/CeO2 Nanoparticles Promoted by Yttrium Doping as Catalysts for CO2 Methanation

“…Positive effects induced by yttrium on the textural properties of different types of supports were also reported in the literature. 39,43,44 Świrket al 43 studied the effect of Y on Ni-based double layered hydroxides for dry reforming of methane and found that doping Y inside the matrix promotes the increase of specific surface area. Similar results were also found for Ce and Y modified double layered hydroxides, showing that higher SSA, pore volume and pore size were obtained over Y-modified catalyst compared to those of Ce-promoted material without the presence of Y.…”

Tailoring the yttrium content in Ni-Ce-Y/SBA-15 mesoporous silicas for CO2 methanation

“…Catalytic conversion of CO 2 to chemicals and fuels plays a significant role in CCU technologies. Accordingly, carbon dioxide can be converted to syngas [6][7][8], methane [9][10][11], methanol [12], higher alcohols [13], diethyl ether [14] through a large variety of reactions. Hydrogenation of carbon dioxide, and CO 2 methanation in particular, has attracted attention of the academic community due to its numerous advantages.…”

“…Transition metal-based catalytic systems, such as Ni [9,16], Co [17], Pd [18], and Rh [19] based catalysts were found promising in the reaction. Among these catalytically active materials, Ni-based catalysts have attracted the most attention due to their numerous advantages, such as high availability, low cost, and high activity and selectivity [20].…”

Effect of Ni/Cu ratio on activity and selectivity of CO2 methanation over Ni‐Cu/SiO2 catalysts

“…CH 4 is highly valuable as a fuel, because of its high energy density (23 625 MJ m –3 , liquefied), serving as synthetic natural gas (SNG) 10 . In the process known as Power‐to‐Gas (PtG), CH 4 may be used as a hydrogen carrier, obtained via renewable energy sources such as biomass, wind, and solar, which generate electricity that is used for electrolysis of H 2 O to obtain H 2 , to be finally converted to CH 4 as it is easier and safer for both storing and transporting than H 2 11–13 …”

“…Concerning metal promotion, some researches has focused on known active metals such as Fe and Co to boost activity and selectivity, or alkali and alkaline‐earth such as Na, Mg, and Ca, and lanthanides such as La, to improve basic properties and enhance CO 2 adsorption due to its mild acidic nature 13,27–31 . Although these additives may also help to maintain properties such as low particle size and resistance to sintering, carbon deposition, and poisoning, some attempts with Cu promotion have been made in order to improve catalysts resistance.…”