Synthesis and CO{sub 2} capture evaluation of Li{sub 2-x}K{sub x}ZrO{sub 3} solid solutions and crystal structure of a new lithium-potassium zirconate phase

Journal Article · Sat Sep 15 04:00:00 EDT 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2007.06.023· OSTI ID:21043832

Veliz-Enriquez, Mayra Y ^[1]; Gonzalez, Gonzalo ^[2]; Pfeiffer, Heriberto ^[2]

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1. Facultad de Ingenieria Quimica, Benemerita Universidad Autonoma de Puebla, Puebla (Mexico)
2. Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Circuito exterior s/n Ciudad Universitaria, Del. Coyoacan, CP 04510, Mexico DF (Mexico)

Solid solutions of lithium and potassium metazirconates Li{sub 2-x}K{sub x}ZrO{sub 3} (where, 0{<=}x{<=}2) were prepared by coprecipitation. Samples were characterized by powder X-ray diffraction, scanning electron microscopy, and thermogravimetric analyses. Results showed that the solubility limits of potassium into Li{sub 2}ZrO{sub 3} is x=0.2. Furthermore, at higher potassium concentrations, a new phase was synthesized, Li{sub 2.27}K{sub 1.19}Zr{sub 2.16}O{sub 6.05}. For structural studies of this new phase, XRD data were analyzed by Rietveld refinements. Additionally, at high potassium concentrations different phases of ZrO{sub 2} were found, as potassium tends to sublimate. On the other hand, lithium-potassium metazirconate solid solutions, Li{sub 2-x}K{sub x}ZrO{sub 3}, were tested as CO{sub 2} captors. Thermal analyses into a CO{sub 2} flux showed that Li{sub 2-x}K{sub x}Zr{sub 2}O{sub 3} solid solutions present a better CO{sub 2} absorption than Li{sub 2}ZrO{sub 3} pure. The differences observed in the CO{sub 2} sorption processes were explained with thermodynamic data. - Graphical abstract: Li{sub 2-x}K{sub x}ZrO{sub 3} samples were synthesized and characterized by XRD, SEM, and TGA. The solubility limits of potassium into Li{sub 2}ZrO{sub 3} is x=0.2. Additionally, a new phase was synthesized, Li{sub 2.27}K{sub 1.19}Zr{sub 2.16}O{sub 6.05}, which was studied by Rietveld. On the other hand, Li{sub 2-x}K{sub x}ZrO{sub 3} solid solutions were tested as CO{sub 2} captors. Analyses showed that Li{sub 2-x}K{sub x}Zr{sub 2}O{sub 3} samples present a better CO{sub 2} absorption than Li{sub 2}ZrO{sub 3} pure.

• OSTI ID: 21043832
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 9 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION
CARBON DIOXIDE
COPRECIPITATION
CRYSTAL STRUCTURE
LITHIUM COMPOUNDS
POTASSIUM COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SOLID SOLUTIONS
SOLUBILITY
SYNTHESIS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
ZIRCONATES
ZIRCONIUM OXIDES