Patent ID: 8404156

Claim:
A process for enriching a synthesis gas in hydrogen, said synthesis gas containing hydrogen, carbon monoxide and steam comprising conversion of carbon monoxide and steam over a catalyst where said synthesis gas has an oxygen to carbon molar ratio of 1.69 to 2.25 and wherein said catalyst contains oxides of zinc and aluminum together with one or more promoters, and wherein the conversion of the carbon monoxide and steam is conducted under high temperature shift conditions where the synthesis gas has a temperature of 300° C. to 400° C. and the pressure is 2.3 to 6.5 MPa, and wherein the catalyst comprises in its active form a mixture of zinc alumina spinel and zinc oxide in combination with a promoter selected from the group consisting of Na, K, Rb, Cs, Cu, Ti, Zr and mixtures thereof and mixtures thereof, said catalyst having a Zn/Al molar ratio in the range 0.5 to 1.0 and a content of alkali metal selected from the group consisting of Na, K, Rb, Cs and mixtures thereof in the range 0.4 to 8.0 wt % based on the weight of oxidized catalyst.