Characterization of potassium salts of 12-tungstophosphoric acid

被引：53

作者：

Holclajtner-Antunovic, I. ^{[1
]}

Mioc, U. B. ^{[1
]}

Todorovic, M. ^{[2
]}

Jovanovic, Z. ^{[3
]}

Davidovic, M. ^{[4
]}

Bajuk-Bogdanovic, D. ^{[1
]}

Lausevic, Z. ^{[3
]}

机构：

[1] Univ Belgrade, Fac Phys Chem, Belgrade 11158, Serbia

[2] Univ Belgrade, Fac Chem, Belgrade 11001, Serbia

[3] Vinca Inst Nucl Sci, Belgrade 11001, Serbia

[4] Inst Gosa, Belgrade 11001, Serbia

来源：

MATERIALS RESEARCH BULLETIN | 2010年 / 45卷 / 11期

关键词：

Superconductors; Proton conductivity; Thermogravimetric analysis; Electron microscopy; Infrared spectroscopy; Raman spectroscopy; HETEROPOLY COMPOUNDS; FUEL-CELL; TUNGSTOPHOSPHORIC ACID; PHOSPHOTUNGSTIC ACID; PROTON CONDUCTIVITY; DEFECT CHEMISTRY; DEHYDRATION; MEMBRANES; CATALYSTS; PERFORMANCE;

D O I：

10.1016/j.materresbull.2010.06.064

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Potassium salts of 12-tungstophosphoric acid with varying amounts of cation, KxH3 - xPW12O40(x = 1, 2, 3) have been prepared and their characteristics investigated by thermal analyses. FT-IR and micro-Raman spectroscopy and SEM-EDS analysis. It was found that the number of replaced protons by potassium ions in the 12-tungstophosphoric acid structure has influence on the presence of different protonic species, their dynamic equilibrium and on the conductivity of salts. The results reported in this study have been applied to improve the structural model of insoluble acidic salts. It is shown that an acidic potassium salt presents a mixture of neutral salt and unreacted acid. The nature of this mixture depends on the number of replaced protons-oxonium ions by cations. Preliminary measurements with synthesized compounds as solid electrolytes in fuel cells have been done, too. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：1679 / 1684

页数：6

共 42 条

[1] PROTONIC CONDUCTIVITY OF ALKALINE-EARTH METAL 12-TUNGSTOPHOSPHATES IN RELATION TO THEIR CATALYTIC ACTIVITY AS SOLID ACIDS [J].

AKIMOTO, M ;

OKAMOTO, M ;

NIIYAMA, H .

CHEMISTRY LETTERS, 1985, (04) :501-504

[2] Density functional study of the vibrational frequencies of α-Keggin heteropolyanions [J].

Bridgeman, AJ .

CHEMICAL PHYSICS, 2003, 287 (1-2) :55-69

[3] Self-assembled polyaniline 12-tungstophosphate micro/nanostructures [J].

Ciric-Marjanovic, Gordana ;

Holclajtner-Antunovic, Ivanka ;

Mentus, Slavko ;

Bajuk-Bogdanovic, Danica ;

Jesic, Dragana ;

Manojlovic, Dragan ;

Trifunovic, Snezana ;

Stejskal, Jaroslav .

SYNTHETIC METALS, 2010, 160 (13-14) :1463-1473

[4] Novel forms of hydrogen in solids: The 'ionic' proton and the 'quasi-free' proton [J].

Colomban, P ;

Tomkinson, J .

SOLID STATE IONICS, 1997, 97 (1-4) :123-134

[5]

COLOMBAN P, 1992, PROTONIC CONDUCTORS

[6] Acidic Cs+, NH4+, and K+ salts of 12-tungstophosphoric acid as solid catalysts for isobutane/2-butene alkylation [J].

Corma, A ;

Martinez, A ;

Martinez, C .

JOURNAL OF CATALYSIS, 1996, 164 (02) :422-432

[7] The influence of monovalent and bivalent cations on the electrical properties of 12-Tungstophosphoric acid salts [J].

Davidovic, A ;

Cajkovski, T ;

Colomban, P ;

Mioc, UB ;

Likar-Smiljanic, V ;

Cajkovski, D ;

Biljic, R ;

Nedic, Z .

SOLID STATE IONICS, 2005, 176 (39-40) :2881-2885

[8] Dilatometry studies of phosphotungstic acid pellets during hydration and dehydration processes and design of a room temperature fuel cell [J].

Dias, FB ;

Fernandes, JB .

JOURNAL OF POWER SOURCES, 1998, 74 (01) :1-7

[9] Performance of potassium 12-tungstophosphoric salts as catalysts for isobutane/butene alkylation in subcritical and supercritical phases [J].

Gayraud, PY ;

Stewart, IH ;

Derouane-Abd Hamid, SB ;

Essayem, N ;

Derouane, EG ;

Védrine, JC .

CATALYSIS TODAY, 2000, 63 (2-4) :223-228

[10] H3PW12O40 acid dispersed on its Cs salt:: improvement of its catalytic properties by mechanical mixture and grinding [J].

Gayraud, PY ;

Essayem, N ;

Védrine, JC .

CATALYSIS LETTERS, 1998, 56 (01) :35-41

← 1 2 3 4 5 →