| 摘要 |
Lanthanum silicate catalyst composites having, in terms of oxide mole ratios, the composition: 0 - 0.3 M2O : La2O3 : 30-200 SiO2 in which M is a monovalent cation. Such catalyst composites are made by reacting a lanthanum compound, an alkali metal compound and a silicon compound with a tetraalkyl ammonium salt of the formula: R<1>xR<2>yN<+>Z in which R<1> and R<2> are C2-C4 alkyl groups, x and y are integers from 1 to 3 such that x + y is 4, and Z is a bromide or hydroxide ion, in an aqueous sulphuric acid medium to form a gel, heating the gel at a temperature of 100 DEG C to 200 DEG C, and filtering, drying and calcining the resulting solid material. These materials are effective catalysts for the conversion of lower alcohols to lower olefins. |
