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Titolo:
Non-hydrothermal synthesis of copper-, zinc- and copper-zinc hydrosilicates
Autore:
Yurieva, TM; Kustova, GN; Minyukova, TP; Poels, EK; Bliek, A; Demeshkina, MP; Plyasova, LM; Krieger, TA; Zaikovskii, VI;
Indirizzi:
Boreskov Inst Catalysis, Novosibirsk 630090, Russia Boreskov Inst Catalysis Novosibirsk Russia 630090 sibirsk 630090, Russia Univ Amsterdam, NL-1012 WX Amsterdam, Netherlands Univ Amsterdam Amsterdam Netherlands NL-1012 WX X Amsterdam, Netherlands
Titolo Testata:
MATERIALS RESEARCH INNOVATIONS
fascicolo: 1, volume: 5, anno: 2001,
pagine: 3 - 11
SICI:
1432-8917(200106)5:1<3:NSOCZA>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
FISCHER-TROPSCH SYNTHESIS; CATALYTIC PROPERTIES; COBALT CATALYSTS; SILICA; HYDROGENOLYSIS; HYDROGENATION; TEMPERATURE; REDUCTION; METHANOL;
Keywords:
CuO/SiO2; ZnO/SiO2; CuO/ZnO/SiO2; non-hydrothermal synthesis of layer silicates homogeneous deposition-precipitation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Yurieva, TM Boreskov Inst Catalysis, Novosibirsk 630090, Russia Boreskov Inst Catalysis Novosibirsk Russia 630090 90, Russia
Citazione:
T.M. Yurieva et al., "Non-hydrothermal synthesis of copper-, zinc- and copper-zinc hydrosilicates", MAT RES INN, 5(1), 2001, pp. 3-11

Abstract

Cu/SiO2, Zn/SiO2 and Cu-Zn/SiO2 samples have been prepared by the homogeneous deposition-precipitation method. The samples were analyzed by thermal analysis, X-ray diffraction and infrared spectroscopy after various heat treatments and compared with data obtained for several minerals. It has been shown that interaction between the components occurs through formation of hydrosilicates. Copper-silica system at a Cu:Si ratio less than or equal to 1, gives rise to a hydrosilicate stable up to a calcination temperature of 930 K resembling the mineral Chrisocolla; at higher ratios a hydroxonitrate (gerhardite type) is also formed. Zinc-silica interaction produces two hydrosilicates such as a well crystallized Hemimorphite at Zn:Si = 2 and highlydispersed Zincsilite at Zn:Si less than or equal to 0.75, both stable up to 1073 K. The Zincsilite structure consists of three layered sheets tan octahedral layer sandwiched by two tetrahedral ones) like the Stevensite mineral group. For the copper-zinc-silica system no copper hydrosilicate is formed. Copper merely enters the Zincsilite structure independently of the applied (Cu + Zn):Si ratio. Resulting layered copper-zinc hydrosilicate may be described by formulaZnx-yCuy(Zn(3-x-z)Cu(z-y)rectangle (x)) [Si4O10] (OH)(2). nH(2)O,where Zn3-x-zCuz-y - ions are located in octahedral sites, Znx-yCuy-ions in the interlayer; rectangle (x) are vacancies in the layers. Copper and zinc in excess of the Zincsilite ratio of Me:Si = 0.75, gives rise to copper and copper-zinc hydroxonitrates.

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Documento generato il 18/11/17 alle ore 03:46:12