| 摘要 |
<p>A gasoline is upgraded by contacting it with a mixture of two catalysts, one of which is a zinc-containg composition which, in addition to zinc, comprises chromium and/or aluminium and which composition has been prepared starting from one or more precipitates obtained by adding a basic reacting substance to one or more aqueous solutions containing salts of the metals involved, the other being a crystalline metal silicate which, after one hour's calcination in air at 500 DEG C has the following properties: a) an X-ray powder diffraction pattern in which the strongest lines are the four lines mentioned in Table A, <IMAGE> b) in the formula which expresses the compsition of the silicate in moles of the oxides and which, in addition to SiO2, includes Al2O3 or Fe2O3 or both Fe2O3 and Al2O3, the SiO2/(Fe2O3 + Al2O3) molar ratio is higher than 10.</p> |
