Layered sodium disilicates as precursors of mesoporous silicas. Part I: Optimisation of the synthesis procedure of δ-Na2Si2O5 and α-Na2Si2O5

• Autorzy: Michalik-Zym Alicja , Zimowska Małgorzata , Bahranowski Krzysztof , Serwicka Ewa

Identyfikatory

DOI

10.2478/v10002-007-0023-8

Warianty tytułu

PL

Warstwowe krzemiany sodu jako prekursory mezoporowatych krzemionek. I: Optymalizacja syntezy -Na2Si2O5 i -Na2Si2O5

• Języki publikacji: EN

Abstrakty

EN

Optimization of the synthetic procedures described in literature aimed at preparing pure δ-Na2Si2O5 has been carried out. The results show that a substantial shortening of the calcination time of amorphous silicate precursor is required, in order to minimize the appearance of the thermodynamically stable α-Na2Si2O5. The use of commercial water glass solution rather than freshly synthesized silica/NaOH slurry is the preferred source of the starting amorphous silicate. Optimized preparative routes for synthesis of single-phase δ-Na2Si2O5 and α-Na2Si2O5 have been described.

PL

Zweryfikowano opisaną w literaturze procedurę syntezy czystego δ -Na2Si2O5. Stwierdzono, że skrócenie czasu kalcynacji amorficznego prekursora krzemianowego z 5–6 godz. do 1 godziny zapewnia otrzymanie niemal czystego α-Na2Si2O5, przy minimalnej ilości termodynamicznie stabilnej fazy -Na2Si2O5. Preferowanym źródłem wyjściowego amorficznego krzemianu sodu jest szkło wodne w miejsce syntetyzowanego roztworu SiO2/NaOH. Użycie szkła wodnego i krótki czas kalcynacji w 700°C prowadzą do otrzymania monofazowego δ -Na2Si2O5. Czysty -Na2Si2O5 można otrzymać kalcynując amorficzny krzemian sodu w temperaturze 825°C.

Słowa kluczowe

EN

Na2Si2O5; layered silicates; kanemite

PL

Na2Si2O5; warstwowe krzemiany; krzemian sodu

• Wydawca: Mineralogical Society of Poland
• Czasopismo: Mineralogia
• Rocznik: 2007
• Tom: Vol. 38, iss. 2
• Strony: 151--160
• Opis fizyczny: Bibliogr. [19] poz., rys., tab., wykr.

Twórcy

autor

Michalik-Zym Alicja

• Polish Academy of Sciences, Institute of Catalysis and Surface Chemistry, ul. Niezapominajek 8, 30-239 Kraków, Poland

autor

Zimowska Małgorzata

• Polish Academy of Sciences, Institute of Catalysis and Surface Chemistry, ul. Niezapominajek 8, 30-239 Kraków, Poland

autor

Bahranowski Krzysztof

• Faculty of Geology, Geophysics and Environmental Protection, AGH-University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Serwicka Ewa

• Polish Academy of Sciences, Institute of Catalysis and Surface Chemistry, ul. Niezapominajek 8, 30-239 Kraków, Poland

Bibliografia

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