Metal Oxides as Catalyst/Supporter for CO2 Capture and Conversion, Review

Abstract

Various carbon dioxide (CO2) capture materials and processes have been developed in recent years. The absorption-based capturing process is the most significant among other processes, which is widely recognized because of its effectiveness. CO2 can be used as a feedstock for the production of valuable chemicals, which will assist in alleviating the issues caused by excessive CO2 levels in the atmosphere. However, the interaction of carbon dioxide with other substances is laborious because carbon dioxide is dynamically relatively stable. Therefore, there is a need to develop types of catalysts that can break the bond in CO2 and thus be used as feedstock to produce materials of economic value. Metal oxide-based processes that convert carbon dioxide into other compounds have recently attracted attention. Metal oxides play a pivotal role in CO2 hydrogenation, as they provide additional advantages, such as selectivity and energy efficiency. This review provides an overview of the types of metal oxides and their use for carbon dioxide adsorption and conversion applications, allowing researchers to take advantage of this information in order to develop new catalysts or methods for preparing catalysts to obtain materials of economic value.

Identification of Nano-Metal Oxides That Can Be Synthesized by Precipitation-Calcination Method Reacting Their Chloride Solutions with NaOH Solution and Their Application for Carbon Dioxide Capture from Air—A Thermodynamic Analysis

“…The above is confirmed for M(x) = Fe(II), Zn(II), La(III), Ce (III) and Sn(II) under 150 bar in [ 92 , 93 , 94 , 95 , 96 ]. Further, CaO [ 71 , 97 , 98 , 99 , 100 ], BeO [ 64 ], Co 3 O 4 [ 101 ], MgO [ 102 , 103 ], FeO, Fe 2 O 3 , Fe 3 O 4 [ 104 ], Li 2 O [ 66 , 105 ], CuO [ 106 , 107 ] and NiO [ 108 ] were used as sorbents in a CO 2 environment.…”

Porous Structure of β-Cyclodextrin for CO2 Capture: Structural Remodeling by Thermal Activation

“…Adsorption is one of the most common methods to capture CO 2 because of its high adsorption capacity, low cost, low energy requirements and ease of operation [ 14 ]. According to the literature report, the adsorbents can be divided into three types [ 15 ]: low-temperature (<200 degrees Celsius (°C)) adsorbents such as metal-organic frameworks [ 16 ] (MOFs), porous organic polymers [ 17 ], porous carbons [ 18 ], zeolites [ 19 ] and organic-inorganic hybrids [ 20 ]; intermediate (200–400 °C) absorbents such as metal oxides [ 21 ] and hydrotalcite [ 22 ], and high-temperature (>600 °C) adsorbents such as lithium zirconate [ 23 ]. Porous carbon-based materials have attracted much attention in CO 2 capture owing to wide availability, physiochemical stability and variable design to tune their porosity [ 24 , 25 , 26 , 27 , 28 ], such as those derived by natural resources including lignin [ 29 , 30 ], starch [ 31 ], cellulose [ 32 , 33 ], chitosan [ 34 , 35 ], cyclodextrin [ 36 , 37 ].…”

Carbon Capture Beyond Amines: CO2Sorption at Nucleophilic Oxygen Sites in Materials

“…The reactivity of metal oxides and hydroxides towards CO 2 in the solid state has been known for over 150 years, and they have recently emerged as promising sorbents for high temperature (> 250 °C) carbon capture applications (Figure 3). [96][97][98][99][100][101][102][103][104] Herein, we provide an overview of the field to facilitate comparison with polymers and MOFs, which are generally studied for capture at low temperatures (< 100 °C) and are the primary focus of this review. The main metal salts that have been studied for carbon capture in the solid state are calcium oxide (CaO, Section 2.1), alternative metal oxides (Section 2.2), and lithium hydroxide (Section 2.3).…”