Enthalpies of formation of microporous titanosilicates ETS-4 and ETS-10

Hongwu Xu; Yiping Zhang; Alexandra Navrotsky

doi:10.1016/S1387-1811(01)00388-2

Enthalpies of formation of microporous titanosilicates ETS-4 and ETS-10

Research output: Contribution to journal › Article › peer-review

Abstract

The energetics of microporous titanosilicates ETS-4 (K_0.61Na₁.₀₉Ti_1.10Si_4.98O₁₃ - 2.89H₂O) has been investigated by high-temperature drop solution calorimetry using lead borate as the solvent at 974 K. Combining the measured heats of drop solution with the published enthalpies of drop solution and formation for the constituent oxides, the standard enthalpies of formation from the oxides (ΔH⁰_f.ox) and from the elements (ΔH⁰_f.e1) for both phases were derived for the first time. The obtained values (in kJ/mol) are as follows: ΔH⁰_f.ox(ETS-4) = -818.5 ± 13.1, ΔH⁰_f.e1(ETS-4) = - 14, 642.8 ± 15.9, ΔH⁰_f.ox(ETS-10) = -262.2 ± 3.1, and ΔH⁰_f.e1(ETS-10) = -6995.2 ± 6.1. Comparison between the ΔH⁰_f.ox (or ΔH⁰_f.e1) values of the two phases suggests that ETS-4 is thermodynamically more stable than ETS-10 with respect to the oxides (or the elements) at 298 K and 1 atm. This behavior can largely be attributed to the higher degree of hydration of ETS-4 than that of ETS-10.

Original language	English (US)
Pages (from-to)	285-291
Number of pages	7
Journal	Microporous and Mesoporous Materials
Volume	47
Issue number	2-3
DOIs	https://doi.org/10.1016/S1387-1811(01)00388-2
State	Published - Oct 2001
Externally published	Yes

Keywords

ETS-10
ETS-4
Energetics
Enthalpy of formation
Titanosilicate

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics
Mechanics of Materials

Access to Document

10.1016/S1387-1811(01)00388-2

Cite this

@article{53572d4a23ec4604a1b5c0c74dac9236,

title = "Enthalpies of formation of microporous titanosilicates ETS-4 and ETS-10",

abstract = "The energetics of microporous titanosilicates ETS-4 (K0.61Na1.09Ti1.10Si4.98 O13 - 2.89H2O) has been investigated by high-temperature drop solution calorimetry using lead borate as the solvent at 974 K. Combining the measured heats of drop solution with the published enthalpies of drop solution and formation for the constituent oxides, the standard enthalpies of formation from the oxides (ΔH0f.ox) and from the elements (ΔH0f.e1) for both phases were derived for the first time. The obtained values (in kJ/mol) are as follows: ΔH0f.ox(ETS-4) = -818.5 ± 13.1, ΔH0f.e1(ETS-4) = - 14, 642.8 ± 15.9, ΔH0f.ox(ETS-10) = -262.2 ± 3.1, and ΔH0f.e1(ETS-10) = -6995.2 ± 6.1. Comparison between the ΔH0f.ox (or ΔH0f.e1) values of the two phases suggests that ETS-4 is thermodynamically more stable than ETS-10 with respect to the oxides (or the elements) at 298 K and 1 atm. This behavior can largely be attributed to the higher degree of hydration of ETS-4 than that of ETS-10.",

keywords = "ETS-10, ETS-4, Energetics, Enthalpy of formation, Titanosilicate",

author = "Hongwu Xu and Yiping Zhang and Alexandra Navrotsky",

note = "Funding Information: We thank Bob Haushalter for allowing us to use his synthesis laboratory at the NEC Research Institute and Martin Wilding for performing the microprobe analysis. This work was supported by the National Science Foundation (grant no. DMR-97-31782) and the Department of Energy Environmental Management Science Program (grant no. FG07-97ER45674). ",

year = "2001",

month = oct,

doi = "10.1016/S1387-1811(01)00388-2",

language = "English (US)",

volume = "47",

pages = "285--291",

journal = "Microporous and Mesoporous Materials",

issn = "1387-1811",

publisher = "Elsevier BV",

number = "2-3",

}

TY - JOUR

T1 - Enthalpies of formation of microporous titanosilicates ETS-4 and ETS-10

AU - Xu, Hongwu

AU - Zhang, Yiping

AU - Navrotsky, Alexandra

N1 - Funding Information: We thank Bob Haushalter for allowing us to use his synthesis laboratory at the NEC Research Institute and Martin Wilding for performing the microprobe analysis. This work was supported by the National Science Foundation (grant no. DMR-97-31782) and the Department of Energy Environmental Management Science Program (grant no. FG07-97ER45674).

PY - 2001/10

Y1 - 2001/10

N2 - The energetics of microporous titanosilicates ETS-4 (K0.61Na1.09Ti1.10Si4.98 O13 - 2.89H2O) has been investigated by high-temperature drop solution calorimetry using lead borate as the solvent at 974 K. Combining the measured heats of drop solution with the published enthalpies of drop solution and formation for the constituent oxides, the standard enthalpies of formation from the oxides (ΔH0f.ox) and from the elements (ΔH0f.e1) for both phases were derived for the first time. The obtained values (in kJ/mol) are as follows: ΔH0f.ox(ETS-4) = -818.5 ± 13.1, ΔH0f.e1(ETS-4) = - 14, 642.8 ± 15.9, ΔH0f.ox(ETS-10) = -262.2 ± 3.1, and ΔH0f.e1(ETS-10) = -6995.2 ± 6.1. Comparison between the ΔH0f.ox (or ΔH0f.e1) values of the two phases suggests that ETS-4 is thermodynamically more stable than ETS-10 with respect to the oxides (or the elements) at 298 K and 1 atm. This behavior can largely be attributed to the higher degree of hydration of ETS-4 than that of ETS-10.

AB - The energetics of microporous titanosilicates ETS-4 (K0.61Na1.09Ti1.10Si4.98 O13 - 2.89H2O) has been investigated by high-temperature drop solution calorimetry using lead borate as the solvent at 974 K. Combining the measured heats of drop solution with the published enthalpies of drop solution and formation for the constituent oxides, the standard enthalpies of formation from the oxides (ΔH0f.ox) and from the elements (ΔH0f.e1) for both phases were derived for the first time. The obtained values (in kJ/mol) are as follows: ΔH0f.ox(ETS-4) = -818.5 ± 13.1, ΔH0f.e1(ETS-4) = - 14, 642.8 ± 15.9, ΔH0f.ox(ETS-10) = -262.2 ± 3.1, and ΔH0f.e1(ETS-10) = -6995.2 ± 6.1. Comparison between the ΔH0f.ox (or ΔH0f.e1) values of the two phases suggests that ETS-4 is thermodynamically more stable than ETS-10 with respect to the oxides (or the elements) at 298 K and 1 atm. This behavior can largely be attributed to the higher degree of hydration of ETS-4 than that of ETS-10.

KW - ETS-10

KW - ETS-4

KW - Energetics

KW - Enthalpy of formation

KW - Titanosilicate

UR - https://www.scopus.com/pages/publications/0035477260

UR - https://www.scopus.com/pages/publications/0035477260#tab=citedBy

U2 - 10.1016/S1387-1811(01)00388-2

DO - 10.1016/S1387-1811(01)00388-2

M3 - Article

AN - SCOPUS:0035477260

SN - 1387-1811

VL - 47

SP - 285

EP - 291

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

IS - 2-3

ER -

Enthalpies of formation of microporous titanosilicates ETS-4 and ETS-10

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this