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Thermodynamic properties of two microporous materials for Na2[M2B12O21] (M = Co2+, Cu2+)

Geng, Yong-Jie; Wang, Jie; Liu, Zhi-Hong

The journal of chemical thermodynamics. Volume 101 (2016, October); pp 157-161 -- Elsevier Science Ltd

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  • Title:
    Thermodynamic properties of two microporous materials for Na2[M2B12O21] (M = Co2+, Cu2+)
  • Author: Geng, Yong-Jie;
    Wang, Jie;
    Liu, Zhi-Hong
  • Found In: The journal of chemical thermodynamics. Volume 101 (2016, October); pp 157-161
  • Journal Title: The journal of chemical thermodynamics
  • Subjects: Thermochimie--Périodiques; Thermodynamique--Périodiques; Thermochemistry--Periodicals; Thermodynamics--Periodicals; Periodicals; Thermochemistry; Thermodynamics; Transition metal borate--Microporous materials--Standard molar enthalpy of formation--Solution calorimetry; Dewey: 541.369
  • Rights: legaldeposit
  • Publication Details: Elsevier Science Ltd
  • Abstract: Highlights:

    Na2Co2B12O21and Na2Cu2B12O21have been synthesized and characterized.

    Enthalpies of solution of both microporous borates were measured by microcalorimeter.

    Enthalpies of solution of CoCl2·6H2O(s) and CuCl2·2H2O(s) were measured, respectively.

    Δf H m θ for both transition metal borates were obtained by thermochemical cycles.

    Na2Co2B12O21(s) is more thermal stable than that of Na2Cu2B12O21(s).

    Abstract:

    Two transition metal borates with microporous structures for Na2Co2B12O21and Na2Cu2B12O21have been synthesized and characterized by XRD, FT-IR, and elemental analysis. The molar enthalpies of solution of Na2Co2B12O21(s) and Na2Cu2B12O21(s) in 1 mol dm −3 HCl(aq) were measured by microcalorimeter at T  = 298.15 K, respectively. The molar enthalpies of solution of CoCl2·6H2O(s) and CuCl2·2H2O(s) in the mixture solvent of 2.00 cm 3 of 1 mol dm −3 HCl(aq) in which 5.30 mg of H3BO3and 0.84 mg of NaCl being added were also measured, respectively. With the incorporation of the previously determined enthalpy of solution of H3BO3(s) in 1 mol dm −3 HCl(aq), together with the standard molar enthalpies of formation for CoCl2·6H2O(s)/CuCl2·2H2O(s), NaCl(s), H3BO3(s), HCl(aq) and H2O(l), the standard molar enthalpies of formation of – (9072.4 ± 9.7) kJ mol −1 for Na2Co2B12O21(s) and – (8887.5 ± 9.7) kJ mol −1 for Na2Cu2B12O21(s) at T  = 298.15 K were obtained on the basis of the appropriate thermochemical cycles. It is obvious that Na2Co2B12O21(s) is more thermal stable than that of Na2Cu2B12O21(s).


  • Identifier: System Number: LDEAvdc_100034641229.0x000001; Journal ISSN: 0021-9614; 10.1016/j.jct.2016.05.026
  • Publication Date: 2016
  • Physical Description: Electronic
  • Shelfmark(s): ELD Digital store

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