Crystallization of X-type zeolite from concentrated sodium silicate and aluminate solutions

Crystallization of an X-type zeolite from concentrated solutions of sodium aluminate (Al₂O₃ 90–330 g l^?1) and silicate (SiO₂ 110–180 g l^?1) was studied.     

Effect of Thermal Treatment on the Acidity and Catalytic Properties of Pentasil-Containing Catalysts

The effect of thermal treatment of zeolite-containing catalysts on their acid and catalytic properties in aromatization of the long distillate of light hydrocarbons was studied.     

Synthesis of High-Ratio Mordenite

Synthesis of a mordenite-like zeolite from reaction mixtures of composition 2.5R ·. (2.2-7.3)Na₂O · Al₂O₃ · (12-40)SiO₂ · (300-1200)H₂O, where R is monoethanolamine, was studied. The crystallization conditions under which mordenite with a SiO₂/Al₂O₃ ratio of 13 to 22 can be synthesized were determined.     

Synthesis of Mordenite-like Zeolite from Secondary Silicon-containing Raw Materials

A low-waste method is proposed for synthesizing a mordenite-like zeolite from secondary silicon-containing raw materials.     

Synthesis of Mordenite with the Use of Aluminum Sulfate Solutions

A procedure has been developed for synthesis of a mordenite-type zeolite with high phase purity and high dispersity of crystals. The procedure is based on hydrothermal crystallization of aluminum-silicon hydrogels prepared from aluminum sulfate solutions serving as a source of Al(III).     

Oligomerization of α-Methylstyrene in the Presence of Mordenite Type Zeolite

The activity and selectivity of coarse-porous H-mordenite in synthesis of cyclic and linear dimers of -methylstyrene were studied.     

The electronic effects of substituents containing phosphorus

Dissociation constants are reported for p-phosphorophenols, p-RC₆H₄OH, in aqueous alcohol (1:1 by volume), and the nucleophilic constants ^– of the R are found to be as follows: (C₆H₅)₂P 0.26, (C₆H₅)P(O) 0.68, (C₆H₅)₂P(S) 0. 63, and (C₆H₅)₂(CH₃)P⁺ 1.28.See [1–3] for previous communications in this series.