Adsorptive Capture of CO₂ from Air and Subsequent Direct Esterification under Mild Conditions

Abstract

Carbon dioxide capture from air (CO 2 ∼ 400 ppm) on powder Ce 0.8 Zr 0.2 O 2 solid solution and subsequent conversion to dimethyl carbonate is described. The process includes three steps, namely (i) adsorptive enrichment of CO 2 on the oxide surface, (ii) transformation under mild conditions (p = 1 bar; T = 70−110 °C) by subsequent gaseous methanol feeding in inert gas, and (iii) desorptive release of the products by treatment with pure inert gas.

One-Pot Method Synthesis of Bimetallic MgCu-MOF-74 and Its CO2 Adsorption under Visible Light

“…Metal–organic framework (MOF) materials, featuring highly effective structures (i.e., ultrahigh surface areas, extraordinary porosity, a highly ordered porous structure, and homogeneous active sites), exhibit considerable potential for use in carbon capture − and sequestration − (CCS) and heterogeneous catalysis, − especially in photocatalysis. − Among the numerous MOFs, Mg-MOF-74 (or CPO-27) exhibits the best CO 2 uptake in low pressures because of its open metal sites. , Yazaydin et al analyzed the CO 2 adsorption capacities of M-MOF-74 (M = Ni, Zn, Co, and Mg) with simulation and experimental methods at 1 bar and 298 K and proved that the CO 2 uptake of Mg-MOF-74 was highest, up to 8 mmol·g –1 . Bao et al proved that the CO 2 uptake of Mg-MOF-74 was considerably higher than that of zeolite 13X, up to 8.61 mmol·g –1 .…”

Recent advances in direct air capture by adsorption

“…Ce 0.8 Zr 0.2 O 2 powder was found to be a multi-functional material for CO 2 adsorption and subsequent conversion to dimethyl carbonate under gaseous methanol stream feeding, despite the product being at the ppm level. 237 This study was meaningful because the conversion occurred at atmospheric pressure and over a mild temperature range of 70–110 °C.…”

“…Because a DAC facility can provide on-site CO 2 generation anywhere, its application is advantageous in addition to its environmental benefits. Recently, the potential application of adsorption-based DAC in indoor air removal, 115,191,193,208,209 CO 2 fertilization, 178,210 biomass production, 211–215 fuel production (CH 4 , 68,70,75,216–222 methanol, 71,223–226 aviation fuel, 73,227–232 hydrocarbons 233 ), chemicals (Fischer–Tropsch process, 234,235 carbon nanotubes, 236 dimethyl carbonate, 237 syngas 238,239 ), mineralization, 240–244 storage, 245,246 enhanced oil recovery (EOR), 247 and cogeneration in power plants or chemical industries 69,248–250 has been reported.…”

Direct air capture: process technology, techno-economic and socio-political challenges

“…Approaches which integrate solid sorbents and heterogeneous catalysis appear to be in the early stages of development. [344][345][346] Early examples involved a DAC sorption stage followed by methanation of CO 2 over a Ru catalyst. 347,348 However, a 'dual function material' has recently been proposed which combines DAC and methanation functionality in a single material, potentially avoiding penalties associated with e.g., a temperature swing and subsequent catalytic conversion.…”