Method and catalyst composite for production of vinyl acetate monomer

摘要

Provided are catalyst composites useful for the production of vinyl acetate monomer, as well as methods of making using same. The catalyst composites may comprise a support comprising silica and about 1 to about 3 wt-% alumina, wherein the support has a surface area of about 175 to about 300 m2/g; and an eggshell layer on the support comprising Pd and Au.

主权项

1. A method of making a catalyst composite, the method comprising:
providing a spherical support material comprising silica and about 1 to about 3 wt-% alumina, wherein the spherical support material has a surface area of about 175 to about 300 m2/g, and a diameter of about 3 mm to about 7 mm; depositing Pd and Au onto the support material to form a catalyst composite precursor comprising:
an inner region; andan outer region;wherein:
the outer region having a depth from the surface to about 500 μm of the spherical support material;the outer region comprising the Pd and Au; andthe inner region being free of the Pd and Au; reducing the catalyst composite precursor at a temperature of about 400° C. to about 500° C. in a reducing gas comprising about 20% to about 100% hydrogen gas for about 1 to about 4 hours to form a reduced catalyst composite precursor; and impregnating the reduced catalyst composite precursor with potassium acetate to form the catalyst composite.