Ni/YMnO3 perovskite catalyst for CO2 methanation

Emerging natural and tailored perovskite-type mixed oxides–based catalysts for CO2 conversions

“…Although thermodynamically favored, the reaction is kinetically limited due to the high inertness of CO 2 . Indeed experimental CO 2 methanation does not yield significant methane production at room temperature and atmospheric conditions (González-Castaño et al, 2021). Therefore, many studies have been carried out on CO 2 methanation to CH 4 in various types of catalytic systems (Wang et al, 2016;Rosid et al, 2019;Lv et al, 2020;Pastor-Pérez et al, 2020).…”

“…Therefore, the development of anti-carbon deposition and high-temperature sintering resistance catalysts is the key to solving the bottleneck of CO 2 methanation (Ashok et al, 2020;Price et al, 2021). During the CO 2 methanation reaction, oxygen vacancies usually play a role in favoring CO 2 adsorption and enhancing the ability to resist carbon deposition (González-Castaño et al, 2021;Blanco et al, 2022). In addition, the oxygen vacancies are also considered to be the key factor for C-O dissociation obtaining higher CH 4 yields (Wang et al, 2016).…”

“…In addition, the oxygen vacancies are also considered to be the key factor for C-O dissociation obtaining higher CH 4 yields (Wang et al, 2016). Considering the importance of oxygen vacancies, perovskite-like materials are promising candidates due to their the elevated oxygen mobility and high-temperature stability (González-Castaño et al, 2021). The generation, recovery, and regeneration of oxygen vacancies (cycle process) are often accompanied by the occurrence of redox reactions .…”

“…For example, M. González-Castaño et al synthesized Ni catalyst supported on YMnO 3 perovskite via coprecipitation method, and the replacement of Mn 3+ by Ni 2+ atoms result in the formation of Mn 4+ species by way of a charge compensation mechanism, which attained the ability to exchange oxygen species, leading to the remarkable performance with TOFs = 20.1 s −1 at 400 °C and 60 L/(g•h). The presence of oxygen vacancies in the YMnO 3-x support effectively enhances the dissociative adsorption of CO 2 through easier redox interconversion, resulting in high activity and stable catalytic behavior without evidence of deactivation (González-Castaño et al, 2021). Similarly, the variable valence metals like Ce (Ren et al, 2021;, Fe (Thalinger et al, 2016b;Steiger et al, 2020), Ti (Tang et al, 2018;Do et al, 2020;Jiang et al, 2021), etc.…”

“…To avoid the agglomeration of active metal, it is desirable to have strong SMSI between the metal and support to achieve high performance (Shin et al, 2016;González-Castaño et al, 2021). Shin et al study found that at the same loading of Co. and Pt (1 and 0.2 wt%, respectively), the barium zirconate support provides a more than six-fold increase in CH 4 formation rate, accompanied by a high CH 4 selectivity as compared to previously studied γ-Al 2 O 3 supports at 325 °C.…”