Patent ID: 8211395

Claim:
A process of purifying exhaust gas, comprising the steps of: contacting an SOx-containing exhaust gas with a mixed multimetallic oxide absorbent for sufficient time to remove SOx from the exhaust gas, wherein the mixed multimetallic oxides are hydrotalcite type compounds having four metallic cations, forming part of sheets of the hydrotalcite type compounds represented by the following formula: [M(II) 1−x−y−z M(II)′ x M(III) y M(III)′ z (OH) 2 ](A n− y+z/n ). m H 2 O, where: [M(II)+M(II)′]/[M(III)+M(III)′], is the molar relationship between divalent cations and trivalent cations, and is between 0.5 and 10; M(II) represents an element of group 2, 6-12 of the periodic table with a valence equal to two; M(II)′ represents an element of group 2, 6-12 of the periodic table with a valence equal to two or three, which can be the same as M(II) but with different valence; M(III) represents an element of group 4-8, 13 with a valence equal to 3 and different from M(II) and M(II)′; M(III)′ represents an element of group 4-8, 13 with a valence equal to 3 and different from M(II) and M(III) or the same as M(III) but with a different valence; A, represents an interlaminar anion located between the sheets; n−, represents the negative electronic charge of the interlaminar anion, and may be from −1 to −8); x=0.01 up to 0.99; y=0.01 up to 0.99; and z=0.01 up to 0.99.