Catalyst for ester production and process for producing ester
A catalyst for ester production which comprises zirconium oxide, copper, and at least one oxide selected from the group consisting of zinc oxide, chromium oxide, aluminum oxide and silicon oxide, and is obtainable by reducing with hydrogen a catalyst precursor prepared by the reaction of a salt containing at least one of metals constituting the oxides, a zirconium salt and a copper salt with an alkali hydroxide; and a process for producing an ester which comprises bringing either an alcohol or an alcohol and an aldehyde into contact with this catalyst in a gas phase.
1. A Cu—ZnO—Al 2 O 3 —ZrO 2 catalyst for ester production, which comprises:
per mole of copper, 0.05–1 mole of zinc oxide, 0.1–1 mole of aluminum oxide and 0.1–1 mole of zirconium oxide, the catalyst having been obtained by reducing with hydrogen, a calcined form of a precipitate prepared by the reaction of a copper salt, a zinc salt, an aluminum salt and a zirconium salt with an alkali metal hydroxide.
2. A process of preparing Cu—ZnO—Al 2 O 3 —ZrO 2 catalyst for ester production, which comprises:
reducing with hydrogen a calcined form of a precipitate prepared from an aqueous solution of copper nitrate, zinc nitrate, aluminum nitrate and zirconyl nitrate, and an alkali metal hydroxide, wherein the mixed aqueous solution contains 0.05–1 mole of zinc nitrate, 0.2–2 moles of aluminum nitrate, 0.1–1 moles of zirconium nitrate, per mole of copper nitrate, the catalyst comprising per mole of copper, 0.05–1 mole of zinc oxide, 0.1–1 mole of aluminum oxide and 0.1–1 mole of zirconium oxide.
3. A process for producing an ester, comprising bringing an alcohol into contact with a catalyst as claimed in claim 1 in a vapor phase, and dehydrogenating the alcohol to form an ester.
4. The process for producing an ester as claimed in claim 3 ,
wherein the alcohol is an alcohol having 1–4 carbon atoms.
5. The process for producing an ester as claimed in claim 3 , wherein ethyl acetate is produced from ethyl alcohol.
6. A process for producing an ester, comprising bringing an alcohol and an aldehyde into contact with a catalyst as claimed in claim 1 in a vapor phase to form an ester.
7. The process for producing an ester as claimed in claim 6 , wherein the alcohol and the aldehyde are an alcohol and an aldehyde having 1–4 carbon atoms.
8. The process for producing an ester as claimed in claim 6 , wherein ethyl acetate is produced from ethyl alcohol and acetaldehyde.
9. The process for producing an ester as claimed in claim 6 , wherein butyl acetate is produced from butyl alcohol and acetaldehyde.