Enhanced CO2 Methanation Reaction in C1 Chemistry over a Highly Dispersed Nickel Nanocatalyst Prepared Using the One-Step Melt-Infiltration Method

Abstract

The Paris Agreement requires the world to put the best efforts to reduce CO2 emissions, due to the global warming problems. As a promising technology corresponding to this greenhouse gas treatment, the CO2 methanation process a.k.a power to gas (PtoG), which catalytically converts CO2 into methane, has been in the limelight. To develop an efficient catalytic process, it is necessary to design a low-cost and high-efficiency catalyst for high CO2 conversion and CH4 selectivity. In this study, we have developed Ni/γ-Al2O3 catalysts by the one-step melt-infiltration method, where both aging and calcination are done in one pot. For enhancement of the catalytic activity and selectivity, sufficient Ni content (>25 wt %) and a high dispersion (<10 nm) are simultaneously required. Thus, the aging conditions of the melt-infiltration methods, e.g., time and temperature, were optimized for the high dispersion with sufficient Ni content (15–50 wt %). The catalytic performance tests were carried out under atmospheric pressure, 275 to 400 °C and gas hourly velocity (GHSV) = 25,000 h−1. And the various characteristic analyses (Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), H2-chemisorption, temperature programmed reduction (TPR), etc.) were performed to confirm the effects on the catalytic performance. As a result, based on the experiments and the characterization data, the 30 wt %-Ni catalyst (Ni particles size = 11 nm) showed the best CO2 conversion at 300 °C and the 20 wt % one having the highest Ni dispersion (Ni particles size = 8.8 nm), which showed the best intrinsic reaction rate and CH4 selectivity in the entire temperature range.

CO2 Methanation of Biogas over 20 wt% Ni-Mg-Al Catalyst: on the Effect of N2, CH4, and O2 on CO2 Conversion Rate

“…Daroughegi et al [12] conducted CO 2 methanation experiments on Al 2 O 3 -supported Ni catalysts with different metal loadings, and the results revealed that the specific surface area and CO 2 conversion increased with an increase in the Ni loading from 15, 20, and 25 wt%, whereas the specific surface area and CO 2 conversion decreased at 33 wt%. In the study on Ni/γ-Al 2 O 3 , Cho et al [13] reported that the highest dispersion, CH 4 selectivity, and reaction rate were observed at 20 wt% Ni content when the Ni content was varied from 15 to 50 wt%.…”

A low temperature organic synthesis of monodispersed NiRu nanocrystals for CO2 methanation

“…9-12 CO 2 capture and recovery is an effective method to deal with the increasing greenhouse effect. [13][14][15] CO 2 methanation for producing hydrocarbons is one of the effective ways of converting waste into resources and energy to solve the problem of CO 2 emissions caused by environmental and energy crisis. [16][17][18][19][20] Besides, CO 2 methanation could be a good route for hydrogen storage and transportation, which could make full use of green hydrogen produced by renewable energy, such as solar energy or by industrial water gas reaction, 9,21,22 contributing to the further realization of a low-carbon society in the future.…”

CO₂ Methanation of Biogas Over 20 wt% Ni-Mg-Al Catalyst: On the Effect of N₂, CH₄, and O₂ on CO₂ Conversion Rate

“…Daroughegi et al [12] conducted CO2 methanation experiments on Al2O3-supported Ni catalysts with different metal loadings, and the results revealed that the specific surface area and CO2 conversion increased with the increase in the Ni loading from 15, 20, and 25 wt%, whereas the specific surface area and CO2 conversion decreased at 33 wt%. In the study on Ni/γ-Al2O3, Cho et al [13] reported that the highest dispersion, CH4 selectivity, and reaction rate were observed at 20 wt% Ni content when the Ni content was varied from 15 to 50 wt%. Jaffar M.M et al [9] compared the activities of the 10 wt% Ni catalysts supported on SiO2, MCN, and Al2O3.…”