摘要:
Crystalline silicates and processes for the production thereof are described. These crystalline silicates are of new crystalline structure, which, as determined after calcination in the air at 550°C, have a composition represented by the general formula (I): pM 2/n O·Al 2 O 3 ·qSiO 2 (the symbols are as defined in the appended claims) and give a principal X-ray diffraction pattern as shown in Table 1. They are superior in heat resistance and acid resistance, and can be used as catalysts for the conversion of various organic compounds, absorbents, or as catalysts for various reactions. They are produced by reacting an aqueous mixture comprising (a) a silica source, (b) an alumina source, (c) an alkali metal and/or alkaline earth metal source, and (d) ethylene glycol or (e) monoethanolamine at a temperature of 100 to 300°C till the desired crystalline silicates are formed. Although ethylene glycol and monoethanolamine do not remain in the crystalline silicates, they play important roles in the formation of the desired crystalline structure in the course of the production thereof.
摘要:
A novel crystalline silicate and a process for the production thereof are described. The novel crystalline silicate is produced by reacting an aqueous mixture containing (a) a silica source, (b) an alumina source, (c) an alkali metal and/or alkaline earth metal source, and (d) methanol in the specific molar ratios at a temperature of 100 to 300°C. The presence of methanol in the reaction system enables to produce crystalline silicates having a novel structure. The composition and X-ray diffraction pattern of the crystalline silicate which has been calcined in air at 550°C are as described in the appended claims. The novel crystalline silicate can be used as a catalyst in various chemical reactions, e.g., in the production of para-xylene by the methylation of toluene, and in the production of an aromatic component-rich gasoline fraction from those hydrocarbons having a low aromatic component content.