[O:1]1[CH2:5][CH:4]=[CH:3][CH2:2]1.[Mg].[Ba].[Na].C(=O)([O-])[O-:10].[Si]([O-])([O-])([O-])[O-].[Na+].[Na+].[Na+].[Na+].C(=O)([O-])[O-].[Na+].[Na+]>[Cu].[Cr].[Zn].O>[C:5]1(=[O:10])[O:1][CH2:2][CH2:3][CH2:4]1.[O:1]1[CH:2]=[CH:3][CH2:4][CH2:5]1.[O:1]1[CH:5]=[CH:4][CH:3]=[CH:2]1
In a manner similar to that described in Example 1 15 mL/h of 2,5-dihydrofuran and 32 mL/h of water were passed at 220° C. over 149 g of a catalyst containing copper and magnesium on silicon dioxide (composition: copper, calculated as Cuo: 43.0 wt %; magnesium, calculated as MgO: 18.0 wt %; silicate, calculated as SiO2 : 35.0 wt %; barium, calculated as BaO: 1 wt %; chromium, calculated as Cr2O3 : 0.6 wt %; zinc, calculated as ZnO: 0.4 wt %; sodium, calculated as Na2O: 0.2 wt %; the remainder being predominantly carbonate; all data based on the total weight of the catalyst; prepared by concurrent precipitation from a solution of the metal salts and sodium silicate (waterglass) with sodium carbonate, drying of the precipitate, extrusion to extrudates using talcum as molding auxiliary and calcination at 500° C., and reduction in a manner similar to that described in Example 1). At a conversion of 97%, γ-butyrolactone was obtained with a selectivity of 85% (2,3-dihydrofuran: 1.4%; furan: 3%; tetrahydrofuran: 9%; n-butanol: 1%; remainder: small amounts of various non-analyzed low-boiling fractions).
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