Recent Progresses in Constructing the Highly Efficient Ni Based Catalysts With Advanced Low-Temperature Activity Toward CO2 Methanation

Abstract

Lv et al.Ni-Based Catalysts CO 2 Methanation auxiliaries and dopants, the fabrication methods, reaction conditions, etc. Finally, the future development trend of the Ni based catalysts is also prospected, which will be helpful to the design and fabrication of the Ni catalysts with high efficiency toward CO 2 methanation process.

The Role of Alkali and Alkaline Earth Metals in the CO2 Methanation Reaction and the Combined Capture and Methanation of CO2

“…Rh and Ru are two of the most common precious metal catalysts studied in this reaction, since they achieve a substantial low-temperature activity and exhibit superior stability [26,27]. Ni-based catalysts, on the other hand, remain the favourite due to their low cost and large natural abundance, but they present some serious drawbacks, including inferior low-temperature activity when compared with Rh and Ru-based catalysts, as well as Ni nanoparticle sintering and coke formation [28,29]. Extensive research effort has been devoted in an attempt to enhance the low-temperature activity of Ni-based catalysts or decrease the loading of precious metal CO 2 methanation catalysts by introducing some kind of metal or metal oxide promoter [27].…”

“…Alkali and especially alkaline earth metal promotion of the CO 2 methanation reaction has been a quite popular route in recent years. These types of metals are cheap, abundant and can potentially promote the CO 2 methanation reaction by increasing support basicity and by introducing oxygen vacancies, thus favouring the initial CO 2 chemisorption [28,30,31], or even by strongly modifying the work function and thus the chemisoptive properties of the metal active phase [32]. Hereby, we categorize the different alkali and alkaline earth metal promoters starting from alkalimetals.…”

“…Besides alkali and alkaline earth metals, lanthanides or rare earths, such as La, Ce and Pr [103], transition metals, such as V, W, Mn, Co and Fe [39,104,105], as well as noble metals, such as Pd, Pt, Rh and Ru [106], are commonly introduced into CO 2 methanation catalysts to enhance their activity. A common Ni-based catalyst promotion with metals, such as Ru, Rh, Pt, Co and Fe, mostly aims at the creation of bimetallic and alloy particles in order to improve the properties of the Ni metallic phase, such as reducibility, metal dispersion and resistance to oxidation, agglomeration and coking [8,28]. On the other hand, lanthanides and some transition metals often target the modification of the metal oxide support to improve properties such as surface basicity and oxygen vacancy concentration, leading to enhanced CO 2 chemisorption similarly to the promotion with alkali and alkaline earth metals [27,28].…”

“…A common Ni-based catalyst promotion with metals, such as Ru, Rh, Pt, Co and Fe, mostly aims at the creation of bimetallic and alloy particles in order to improve the properties of the Ni metallic phase, such as reducibility, metal dispersion and resistance to oxidation, agglomeration and coking [8,28]. On the other hand, lanthanides and some transition metals often target the modification of the metal oxide support to improve properties such as surface basicity and oxygen vacancy concentration, leading to enhanced CO 2 chemisorption similarly to the promotion with alkali and alkaline earth metals [27,28].…”

Recent Progresses in the Design and Fabrication of Highly Efficient Ni-Based Catalysts With Advanced Catalytic Activity and Enhanced Anti-coke Performance Toward CO2 Reforming of Methane

“…During the sol-gel process, it is easy to achieve the uniform doping of the active ingredients in molecular level at low synthesis temperature (Aghamohammadi et al, 2017). However, the sol-gel process usually takes a long time and a large amount of gas and organic compounds will be released during the drying process (Lv et al, 2020). The catalysts prepared by the sol-gel method possess the advantages of narrow particle size distribution, high resistant property to thermal agglomeration, and low deactivation rate (Hassani Rad et al, 2016).…”