Tetraethyl ammonium silicate

Foreign cations were added to the powder according to the incipient wetness method from nitrate salts for Mg2+, Y3+, and A13+, and from tetraethyl ammonium silicate for Si. A subsequent washing with water was achieved in order to eliminate nitrates from the powder surface. The residual concentration in nitrates was lower than 0.015 at %. The samples were then calcined at 723 K in the ambiant air for four hours. Final concentrations of the foreign cations added were fixed equal to 0.5, 1.0, 2.0 and 10.0 at %. 

Four precipitated iron-based catalysts were used. The first catalyst consisted of only iron. The other catalysts contained either added potassium, added silicon or both. The catalysts were designated in terms of the atomic ratios as lOOFe, 100Fe/3.6Si, 100Fe/0.71K and 100Fe/3.6Si/0.71K. The catalysts were prepared by continuous precipitation from iron (111) nitrate and concentrated ammonium hydroxide. For silica-containing catalysts, a colloidal suspension of tetraethyl ortho silicate was mixed with the iron nitrate solution prior to precipitation. Potassium was added to the catalysts in the form of potassium tertiary butoxide during the loading of the FTS reactor. 

Tetraethoxysilane. See Ethyl silicate Tetraethylammonium bromide CAS 71-91-0 EINECS/ELINCS 200-769-4 Synonyms Ammonium, tetraethyl-, bromide Ethanaminium, N,N,N-triethyl-, bromide TEAB Tetrylammonium bromide N,N,N-Triethylethanaminium bromide Classification Nonaromatic amine Empirical CaH2oBrN Formula (C2Hs)4N Br ... 

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