Metal-loaded zeolite catalysts for the halogen-free conversion of dimethyl ether to methyl acetate
A catalyst for the carbonylation of dimethyl ether to methyl acetate. The catalyst comprises a zeolite, such as a mordenite zeolite, at least one Group IB metal, such as copper, and/or at least one Group VIII metal, such as iron, and at least one Group IIB metal, such as zinc. Such a catalyst with combined metals provides enhanced catalytic activity, improved stability, and improved selectivity to methyl acetate, and does not require a halogen promoter, as compared to a metal-free or copper only zeolite.
1. A catalyst for the carbonylation of dimethyl ether to produce methyl acetate, comprising: (i) a mordenite zeolite; (ii) zinc; and (iii) copper, wherein said copper and said zinc are present in said catalyst at a molar ratio of said copper to said zinc of about 0.25.
2. The catalyst of claim 1 wherein said catalyst is free of halogens and halogen-containing compounds.
3. The catalyst of claim 1 , and further comprising: (iv) palladium.
4. The catalyst of claim 1 wherein said mordenite zeolite has a Si/Al ratio of from about 5:1 to about 90:1.
5. The catalyst of claim 4 wherein said mordenite zeolite has a Si/Al ratio of from about 5:1 to about 50:1.