Thermal Stability and High-Temperature Carbon Dioxide Sorption on Hexa-lithium Zirconate (Li6Zr2O7)

Pfeiffer, Heriberto; Bosch, P.

doi:10.1021/cm047897+

Cited by 118 publications

(126 citation statements)

References 21 publications

(24 reference statements)

Supporting

Mentioning

121

Contrasting

Order By: Relevance

“…[6][7][8][9][10][11][12][13] In general, all these materials show a similar chemisorption mechanism. First, CO 2 reacts over the ceramic particle surface, producing a lithium carbonate (Li 2 CO 3 ) external shell and the corresponding residual oxide.…”

mentioning

confidence: 91%

Lithium Cuprate (Li2CuO2): A New Possible Ceramic Material for CO2 Chemisorption

Palacios-Romero¹,

Pfeiffer²

2008

Chemistry Letters

Self Cite

View full text Add to dashboard Cite

Li 2 CuO 2 was used for the CO 2 chemisorption process. Li 2 CuO 2 was thermally treated under a flux of CO 2 , dynamically (from 25 to 1000 C) and isothermically. The results clearly showed that Li 2 CuO 2 is able to chemisorb CO 2 in a wider range of temperatures than those presented by other lithium ceramics. Therefore, this ceramic may become a new option as CO 2 captor.In the last ten years, some lithium ceramics have been proposed as possible CO 2 captors because of the chemisorption process produced between CO 2 and lithium atoms present in the ceramic structure.1-5 Some of the ceramics proposed up to now are; lithium oxide (Li 2 O), lithium zirconates (Li 2 ZrO 3 and Li 6 Zr 2 O 6 ), lithium orthosilicate (Li 4 SiO 4 ), and lithium orthotitanate (Li 4 TiO 4 ). [6][7][8][9][10][11][12][13] In general, all these materials show a similar chemisorption mechanism. First, CO 2 reacts over the ceramic particle surface, producing a lithium carbonate (Li 2 CO 3 ) external shell and the corresponding residual oxide. Then, in order to continue the CO 2 chemisorption, lithium atoms have to diffuse from the core of the particles toward the surface to complete the reaction. 6 Additionally, it has been proposed that one of the most important steps, and perhaps the limiting one, of the whole process is the diffusion. On the other hand, lithium cuprate (Li 2 CuO 2 ) has been used for different electrical applications such as cathodes for lithium batteries and as a superconductor material, owing to the excellent lithium diffusion.14-19 The high lithium diffusion and structural characteristics have been reported for Li 2 CuO 2 ; therefore, the aim of the work reported here was to study and demonstrate whether or not Li 2 CuO 2 is able to capture CO 2 , by a mechanism similar to that reported previously for other lithium ceramics.Li 2 CuO 2 sample was obtained by a coprecipitation method using 10 wt % excess of lithium, and its diffractogram is shown in Figure 1. Li 2 CuO 2 was the main phase, and only small quantities of copper oxide (CuO) were detected. The presence of CuO indicates that excess lithium was not enough to complete the reaction. However, the volume fraction of this phase should not exceed 5% of the total system, and as CuO does not capture CO 2 , it would not interfere with the CO 2 capture analysis. The same figure shows the morphology of the Li 2 CuO 2 particles. As can be seen, the particles presented a dense polyhedral shape, with a particle size distribution of 11 AE 2 mm. Additionally, the particles presented some kind of texture; the surface of the particles seems to be corrugated. This kind of morphology and particle size are similar to those obtained for other lithium ceramics that have been tested as CO 2 captors. It could be useful for comparison reasons.Once Li 2 CuO 2 was characterized, the material was thermally treated under a CO 2 stream to analyze whether or not this material is able to act as a CO 2 captor. If Li 2 CuO 2 traps chemically CO 2 , the following reaction may occur (reaction 1):...

show abstract

mentioning

confidence: 91%

Lithium Cuprate (Li2CuO2): A New Possible Ceramic Material for CO2 Chemisorption

Palacios-Romero¹,

Pfeiffer²

2008

Chemistry Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hence, the materials with high CO 2 capture capacity at high temperature are desirable. In recent years, the development of regenerable sorbents for high temperature CO 2 capture has received increasing attention [5][6][7]. Compared with other sorbents, Li 4 SiO 4 has the better CO 2 absorption properties over a wide range of temperature and CO 2 concentration [8,9].…”

mentioning

confidence: 99%

Preparation and kinetic analysis of Li4SiO4 sorbents with different silicon sources for high temperature CO2 capture

Shan

Jiang

et al. 2012

Chin. Sci. Bull.

View full text Add to dashboard Cite

Using diatomite and analytical pure SiO 2 as silicon sources, Li 4 SiO 4 sorbents for high temperature CO 2 capture were prepared through solid-state reaction method. Phase composition was analyzed by X-ray diffraction, and the CO 2 absorption capacity and absorptoin-desorption performance were studied by the simultaneous thermal thermogravimetric analyzer (TG-DSC). The results showed that silicon source had an important influence on CO 2 absorption properties. The kinetic parameters for the chemisorption and diffusion processes were obtained by the isothermal study for different silicon sources. The results showed that the activation energies for these two processes were estimated to be 105.427 and 35.928 kJ/mol for the sample with analytical pure SiO 2 (AS). While for the sample with diatomite (DS), the activation energies for these two processes were estimated to be 78.500 and 20.439 kJ/mol, respectively. The increasing CO 2 concentration in the atmosphere due to fossil fuel burning has been considered as a major contributor to the global warming. So the separation, recovery and storage/utilization of CO 2 have attracted considerable attention in recent years. CO 2 can be removed from flue gas and waste gas streams by various methods such as membrane separation, wet absorption, and dry absorption [1][2][3][4]. However, these methods need to consume a lot of energy. Hence, the materials with high CO 2 capture capacity at high temperature are desirable. In recent years, the development of regenerable sorbents for high temperature CO 2 capture has received increasing attention [5][6][7]. Compared with other sorbents, Li 4 SiO 4 has the better CO 2 absorption properties over a wide range of temperature and CO 2 concentration [8,9]. In order to study the absorption mechanism of Li 4 SiO 4 materials, some researchers made some kinetic study about Li 4 SiO 4 materials [10]. However, kinetic study about different silicon sources has not been reported.In this paper, we firstly developed novel low-cost Li 4 SiO 4 sorbents for high temperature CO 2 capture using diatomite as silicon source. The effect of different silicon sources on the absorption capacity was investigated by studying their kinetic characteristics. In the following paper, DS and AS stand for diatomite and analytical pure SiO 2 , respectively.

show abstract

“…This most likely is the result of the hygroscopic nature of the dried product and the consequent segregation of LiCl to material surfaces and Li loss during heating. Lithium loss through combined lithium rejection at growth interfaces and sublimation of lithium as either Li (g) , LiO (g) or Li 2 O (g) during firing, particularly above 800°C, is a commonly observed phenomena in Li bearing ceramics [42][43][44][45][46][47][48] and thus it is likely to be evident also in materials synthesised from a LiOH precursor, albeit to a notably lesser extent relative to chloride precursor derived samples.…”

Section: Xrdmentioning

confidence: 99%

Solution based synthesis of mixed-phase materials in the Li2TiO3–Li4SiO4 system

Hanaor

Kolb

Gan

et al. 2015

Journal of Nuclear Materials

View full text Add to dashboard Cite

Abstract:As candidate tritium breeder materials for use in the ITER helium cooled pebble bed, ceramic multiphasic compounds lying in the region of the quasi-binary lithium metatitanate-lithium orthosilicate system may exhibit mechanical and physical advantages relative to single phase materials. Here we present an organometallic solution-based synthesis procedure for the low-temperature fabrication of compounds in the Li 2 TiO 3 -Li 4 SiO 4 region and investigate phase stability and transformations through temperature varied X-ray diffraction and scanning calorimetry. Results demonstrate that the metatitanate and metasilicate phases Li 2 TiO 3 and Li 2 SiO 3 readily crystallise in nanocrystalline form at temperatures below 180°C. Lithium deficiency in the region of 5% results from Li sublimation from Li 4 SiO 4 and/or from excess Li incorporation in the metatitanate phase and brings about a stoichiometry shift and product compounds with mixed lithium orthosilicate/ metasilicate content towards the Si rich region and predominantly Li 2 TiO 3 content towards the Ti rich region. Above 1150°C the transformation of monoclinic to cubic γ-Li 2 TiO 3 disordered solid-solution occurs while the melting of silicate phases indicates a likely monotectic type system with a solidus line in the region 1050°-1100°C. Synthesis procedures involving a lithium chloride precursor are not likely to be a viable option for breeder pebble synthesis as this route was found to yield materials with a more significant Li-deficiency exhibiting the crystallisation of the Li 2 TiSiO 5 phase at intermediate compositions.

show abstract

Thermal Stability and High-Temperature Carbon Dioxide Sorption on Hexa-lithium Zirconate (Li₆Zr₂O₇)

Cited by 118 publications

References 21 publications

Lithium Cuprate (Li2CuO2): A New Possible Ceramic Material for CO2 Chemisorption

Lithium Cuprate (Li2CuO2): A New Possible Ceramic Material for CO2 Chemisorption

Preparation and kinetic analysis of Li4SiO4 sorbents with different silicon sources for high temperature CO2 capture

Solution based synthesis of mixed-phase materials in the Li2TiO3–Li4SiO4 system

Contact Info

Product

Resources

About