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The invention provides a water gas shift process comprising a reaction stage. The reaction stage comprises (a) providing a gas mixture comprising CO, H2O and an acid gas component to a reactor containing an adsorbent, and (b) subjecting the gas mixture to water gas shift reaction conditions to perfo

The invention provides a water gas shift process comprising a reaction stage. The reaction stage comprises (a) providing a gas mixture comprising CO, H2O and an acid gas component to a reactor containing an adsorbent, and (b) subjecting the gas mixture to water gas shift reaction conditions to perform the water gas shift reaction. The adsorbent comprises an alkali promoted alumina based material. The acid gas component comprises H2S.

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1. A water gas shift process comprising: (a) providing a gas mixture comprising CO, H2O and an acid gas component to a reactor comprising an adsorbent, wherein the adsorbent comprises a metal oxide comprising alumina, magnesia, and an alkali metal,wherein the reactor does not comprises a catalyst, a

1. A water gas shift process comprising: (a) providing a gas mixture comprising CO, H2O and an acid gas component to a reactor comprising an adsorbent, wherein the adsorbent comprises a metal oxide comprising alumina, magnesia, and an alkali metal,wherein the reactor does not comprises a catalyst, andwhere the acid gas component comprises at least 200 ppm H2S relative to the gas mixture, and(b) subjecting the gas mixture to water gas shift reaction conditions to perform the water gas shift reaction. 2. The process according to claim 1, wherein the volume of H2O in the gas mixture is at least 1.5 times the volume of CO. 3. The process according to claim 1, wherein the acid gas component further comprises one or more components selected from the group consisting of HCN, COS, CS2, NOx, SOx and HCl. 4. The process according to claim 1, wherein the gas mixture is subjected to water gas shift reaction conditions at a temperature in the range of 300-600° C. 5. The process according to claim 1, wherein the alkali metal comprises potassium. 6. The process according to claim 1, wherein the gas mixture comprises coal-derived synthesis gas. 7. A water gas shift process comprising: (a) providing a gas mixture comprising CO, H2O and an acid gas component to a reactor comprising an adsorbent and optional catalyst, where the adsorbent comprises a metal oxide comprising alumina, magnesia, and an alkali metal,wherein the weight ratio of adsorbent to any catalyst is greater than 10, andwherein the acid gas component comprises at least 200 ppm H2S relative to the gas mixture, and(b) subjecting the gas mixture to water gas shift reaction conditions to perform the water gas shift reaction, wherein the adsorbent is derived from an alkali promoted hydrotalcite having the chemical formula: [MII(1-x)Al(αx)MIII((1-α)x)(OH)2][Cn-](x/n).yH2O.zMI(m)Am- wherein MI is one or more selected from the group consisting of Li, Na, K, Rb and Cs;MII comprises Mg and, optionally, further comprises one or more of Mn, Cu, Co, Fe, Cd and Cr;Al is aluminium;MIII is optionally one or more of the group consisting of Fe, Cr and Mn;Cn- is one or more anions selected from the group consisting of NO3−, SO42−, CO32−, CH3CO2−, Cl−, Br−, F− and I−;Am- is one or more anions,n=1 or 2; x=0.01-0.99; y=0-4; z=0.001-7; and α=0.5-1. 8. The process according to claim 7, wherein x=0.3-0.7. 9. The process according to claim 7, wherein the adsorbent comprises potassium and has a ratio Mg:Al in the range of 30:70-70:30. 10. The process according to claim 7, wherein MI comprises potassium. 11. The process according to claim 7, wherein Am- is one or more of CO32−, CH3CO2−, C2O42−, NO3−, SO42−, CO32−, CH3CO2−, OH−, Cl−, Br−, F− and I−.