Thermal decomposition of chromium(III) nitrate(V) nanohydrate -: Different chromium oxides CrO1.5+y formation

被引：37

作者：

Malecki, A ^{[1
]}

Malecka, B ^{[1
]}

Gajerski, R ^{[1
]}

Labus, S ^{[1
]}

机构：

[1] Univ Min & Met Krakow, Fac Mat Sci & Ceram, PL-30059 Krakow, Poland

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2003年 / 72卷 / 01期

关键词：

chromium(III) nitrate(V); chromium oxides; evolved gas analysis; thermal decomposition;

D O I：

10.1023/A:1023915618876

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Thermal decomposition of Cr(NO3)(3).9H(2)O in helium and in synthetic air was studied by means of TG, DTA, EGA and XRD analysis. The dehydration occurs together with decomposition of nitrate(V) groups. Eight distinct stages of reaction were found. Intermediate products of decomposition are hydroxy- and oxynitrates containing chromium in hexa- and trivalent states. The process carried out in helium leads to (Cr-0.07Cr-0.93O-2.90)-Cr-III-O-VI at about 260degreesC and in air (Cr-0.01Cr-0.99O-2.99)-Cr-III-O-VI is formed at about 200degreesC. The final product of decomposition (>450degreesC) is Cr2O3, both in helium and in air.

引用

页码：135 / 144

页数：10

共 12 条

[1] STUDY ON THE THERMAL-DECOMPOSITION OF CHROMIUM(III) NITRATE NONAHYDRATE (CNN) [J].

GUBRYNOWICZ, L ;

STROMICH, T .

THERMOCHIMICA ACTA, 1987, 115 :137-151

[2] CHROMIUM(IV) OXIDE PREPARED FROM CHROMIUM(III) NITRATE NONAHYDRATE [J].

HILL, WD .

INORGANICA CHIMICA ACTA-LETTERS, 1982, 65 (03) :L100-L100

[3]

KALINICHENKO II, 1974, ZH NEORG KHIM+, V19, P1547

[4]

MAITI GC, 1975, J INDIAN CHEM SOC, V52, P1119

[5] Non-isothermal studies on mechanism and kinetics of thermal decomposition of cobalt(II) oxalate dihydrate [J].

Malecka, B ;

Drozdz-Ciesla, E ;

Malecki, A .

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 2002, 68 (03) :819-831

[6] Mechanism of thermal decomposition of d-metals nitrates hydrates [J].

Malecki, A ;

Gajerski, R ;

Labus, S ;

Prochowska-Klisch, B ;

Wojciechowski, KT .

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 2000, 60 (01) :17-23

[7]

MALECKI A, 2002, IN PRESS P 8 BRETSZN

[8]

MATUSEVICH IS, 1969, ZH PRIKL KHIM, V42, P1657

[9] Thermal decomposition of nitrogenous salts under vacuum [J].

Sayi, YS ;

Yadav, CS ;

Shankaran, PS ;

Chhapru, GC ;

Ramakumar, KL ;

Venugopal, V .

INTERNATIONAL JOURNAL OF MASS SPECTROMETRY, 2002, 214 (03) :375-381

[10] Chromia supported on titania .6. Properties of different chromium oxide phases in the catalytic reduction of NO by NH3 studied by in situ diffuse reflectance FTIR spectroscopy [J].

Schneider, H ;

Maciejewski, M ;

Kohler, K ;

Wokaun, A ;

Baiker, A .

JOURNAL OF CATALYSIS, 1995, 157 (02) :312-320

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