Ultrafast Carbon Dioxide Sorption Kinetics Using Lithium Silicate Nanowires

Abstract

In this paper, the LiSiO nanowires (NWs) were shown to be promising for CO capture with ultrafast kinetics. Specifically, the nanowire powders exhibited an uptake of 0.35 g g of CO at an ultrafast adsorption rate of 0.22 g g min at 650-700 °C. Lithium silicate (LiSiO) nanowires and nanopowders were synthesized using a "solvo-plasma" technique involving plasma oxidation of silicon precursors mixed with lithium hydroxide. The kinetic parameter values (k) extracted from sorption kinetics obtained using NW powders are 1 order of magnitude higher than those previously reported for the LiSiO-CO reaction system. The time scales for CO sorption using nanowires are approximately 3 min and two orders magnitude faster compared to those obtained using lithium silicate powders with spherical morphologies and aggregates. Furthermore, LiSiO nanowire powders showed reversibility through sorption-desorption cycles indicating their suitability for CO capture applications. All of the morphologies of LiSiO powders exhibited a double exponential behavior in the adsorption kinetics indicating two distinct time constants for kinetic and the mass transfer limited regimes.

Lithium silicate nanosheets with excellent capture capacity and kinetics with unprecedented stability for high-temperature CO2 capture

“…3b); [5][6][7][17][18][19][20][21][22][23][24][25][26][27][28][29] however, the LSNs were found to be stable even aer 200 cycles. The LSNs were even better than one of the best recently reported sorbents, lithium silicate nanowires (NWs) 8 (Fig. 3c).…”

“…Recently, nanowires of lithium silicates and lithium tungstate showed good kinetics of CO 2 capture. 8,9 However, these nanowires were not stable against agglomeration/sintering during the high-temperature CO 2 adsorption-desorption process, with a loss of 50% of their capture performance (capacity and kinetics) in the rst three cycles. Thus, there was a need for a sorbent that has the following properties: (i) high CO 2 capture at elevated temperatures (between 600 and 750 C), (ii) faster rate of adsorption/desorption, and (iii) cycling stability for hundreds of CO 2 capture-release cycles.…”

A new nanowire-based lithium hexaoxotungstate anode for lithium-ion batteries

“…Fortunately, current research has introduced a variety of functional materials with 1D morphologies that could be prepared via cost-effective and easily scalable procedures. [24][25][26] Anodes based on tungsten oxide (WO 3 ) and its composites, in particular, have drawn immense attention from researchers as they offer high specic capacities. 27 WO 3 materials with monoclinic and hexagonal structures with varying morphologies have been thoroughly investigated for LIB applications.…”

Recent advances in lithium containing ceramic based sorbents for high-temperature CO2 capture

“…Recently, several new synthesis methods including solvo-plasma method, spray-drying method, and combustion method have been reported for the synthesis of Li4SiO4 for high-temperature CO2 capture. For instance, Nambo et al 74 successfully synthesized Li4SiO4 nanowires using a so-called "solvo-plasma" technique which contains plasma oxidation of Si precursors mixed with LiOH (Figure 5). The specific surface area of these Li4SiO4 nanowires sorbent reached 10.2 m 2 g -1 and the average pore size was 11.5 nm.…”