Germanium-incorporated lithium silicate composites as highly efficient low-temperature sorbents for CO2 capture. Issue 17 (18th April 2018)

• Record Type: Journal Article
• Authors: Subha, P. V.; Nair, Balagopal N.; Visakh, V.; Sreerenjini, C. R.; Mohamed, A. Peer; Warrier, K. G. K.; Yamaguchi, T.; Hareesh, U. S.
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 17(2018)
• Page Start: 7913
• Page End: 7921
• Publication Date: 2018-04-18
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta00576a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Germanium-incorporated lithium silicate nanostructures with exceptional carbon dioxide absorption kinetics and capacity in the temperature range of 150–700 °C. Abstract : Carbon dioxide emission from massive point sources such as industries and power plants is perceived to be a major contributor towards global warming and associated climate changes. Although lithium silicate has the highest capacity for CO2 sorption (8 mmol g −1 ), it is kinetically limited during the sorption process, particularly at temperatures below 500 °C. Herein, we report a facile strategy for the development of germanium-incorporated lithium silicate composites, which display enhanced CO2 absorption capacity as well as kinetics in the temperature range of 150–680 °C. The absorption capacity of 324 mg g −1 at the rate of 117 mg g −1 min −1 was measured at 680 °C, and 49 mg g −1 at the rate of 36 mg g −1 min −1 was measured at 300 °C for samples with a Si : Ge molar ratio of 1 : 0.183. This study thus highlights the possibility of employing germanium-incorporated lithium silicates for the absorption of CO2 at a wide range of temperatures, including the in situ removal of CO2 from chemical and petrochemical reactions, such as the water–gas shift reaction occurring at low temperature ranges of 150–450 °C, that has hitherto been not possible with pure Li4 SiO4 .