| 摘要 |
<p>Hydroforming catalysts containing at least one metal oxide and having a minimum of three components, the components having been coprecipitated simultaneously are made by:- (a) coprecipitating a mixture of at least three metal compounds at a pH of 5.5-8, the mixture having the following characteristics:- (i) it consists of a solution or sol, (ii) at least one of the metal compounds is selected from Groups II, III or IV and possesses isomerisation activity, (iii) at least one of the metals compounds is selected from vanadium and Groups VI and VIII of the Periodic Table and possesses hydrogenation activity as metal, oxide or sulphide, and (IV) at least one of the metal compounds being a chloride, (b) reducing the chloride content of the resulting coprecipitate to below 0.25% of the total weight by washing and anion exchange, the latter being conducted in the presence of acetate ion and (c) drying and then if necessary calcining the resulting coprecipitate. Requirement (ii) may be satisfied by mixtures of Al, Mg, Si, Ti, Th, Zr, Hf, Ce, Sm, and Eu and (iii) by Cr, Mo, W, Mn, Re and Ni as metals, oxides or sulphides. Examples describe physical properties e.g. particle size, surface area, bulk density of catalysts. Regeneration is also described.</p> |
