Lab-scale tests of different materials for the selection of suitable sorbents for CO2 capture with H2 production in IGCC processes

Development of sodium/lithium/fly ash sorbents for high temperature post-combustion CO 2 capture

“…In comparison, it has been reported that K-doped hydrotalcite sorbents lost capacity after just 3 cycles at 500°C [9]. Therefore, compared to other high temperature sorbents such as CaO, stability of Li/Na-FA is superior.…”

“…With post-combustion capture, the flue gas is ideally available from the coal-fired boiler temperature (<1100°C) to that of the stack gas (about 50°C) and thus, a wide range of separation temperatures can be considered [7]. Also, industrial plants such as cement and steel works generate flue gas at temperatures higher than 900°C [8,9]. Therefore, the development of efficient CO 2 sorbents able to work at high temperatures would help to reduce the associated CO 2 capture energy penalty, since CO 2 sorption thermodynamics and rapid sorption kinetics are favoured at high temperature [8,10].…”

“…Typically, alkaline ceramics present a double-step sorption mechanism, with an initial chemical sorption of CO 2 over the ceramic surface, which forms a carbonate shell, followed by the CO 2 diffusing through the carbonate external layer to reach the surface and further react with the alkaline element [14]. Not many materials have been investigated so far at high temperatures, where the most notable are hydrotalcite-like materials, MgO precursors (dolomite, magnesite) and ceramics [9]. Amongst the materials tested, pure lithium silicate (Li 4 SiO 4 ) has shown the largest CO 2 sorption capacity and the fastest CO 2 sorption rate over a wide range of temperatures and CO 2 concentrations [17][18][19].…”

Synthesis, characterization and evaluation of porous polybenzimidazole materials for CO2 adsorption at high pressures

“…These energy production technologies have generated an unavoidable associated concern of CO 2 emission (Blok et al 1997), which has subsequently caused various health and environmental issues (Muradov and Veziroglu 2005). Numerous techniques (Jansen et al 1992;Farla et al 1995;Ketzer et al 2012) and materials (Maroño et al 2014) have been used to capture and separate the unwanted CO 2 emitted at any stage during the industrial process of energy production from natural resources. Selection of material for CO 2 capture at different environmental and industrial conditions is still a major challenge for the energy generation sector.…”

Regenerable magnesium-based sorbent for high-pressure and moderate-temperature CO2 capture: Physicochemical structures and capture performances

“…A variety of solid sorbents for CO 2 capture have been studied and reported in Literatures. According to the CO 2 adsorption mechanisms, these solid sorbents can be classified into two types: physisorbents (microporous and mesoporous inorganic and organic materials such as zeolites [3], silica gel [4], activated carbon [5], and metal-organic frameworks (MOFs) [6]) and chemisorbents (Ca-based materials such as CaO [7], alkali metal-based materials such as NaOH [8], K 2 CO 3 [9] and Na 2 CO 3 [10], and Mg-based materials such as Mg(OH) 2 [1,2], MgO [11][12][13], hydrotalcite [14,15], and alkali metal-promoted hydrotalcite [16][17][18][19]). Usually, these physisorbents and chemisorbents for CO 2 capture are separately used in the pressure/temperature swing adsorption (PSA/TSA) system at relatively low temperatures (even near ambient temperature) and the TSA system at different temperatures [20].…”