| 摘要 |
The present invention is directed to processes for selective formation of ethanol from acetic acid by hydrogenating acetic acid in the presence of a hydrogenation catalyst, wherein the temperature and liquid hourly space velocity (LHSV) are controlled to maximize acetic acid conversion and to minimize selectivity to ethyl acetate. The hydrogenation catalyst comprises a metal selected from the group consisting of platinum, palladium, gold, iridium, osmium, and rhodium on a support modified by at least one support modifier selected from the group consisting of (i) alkaline earth metal oxides, (ii) alkali metal oxides, (iii) alkaline earth metal metasilicates, (iv) alkali metal metasilicates, (v) Group IIB metal oxides, (vi) Group IIB metal metasilicates, (vii) Group IIIB metal oxides, (viii) Group IIIB metal metasilicates, and mixtures thereof. |
