Process for making, and use of, anionic clay materials
Anionic clay compounds such as hydrotalcite-like compounds can be made by a process wherein a non-hydrotalcite-like compound (or a hydrotalcite-like compound) are heat treated and then hydrated to form hydrotalcite-like compounds having properties (e.g., increased hardness and/or density) that differ from those of hydrotalcite-like compounds made by prior art methods wherein non-hydrotalcite-like compounds (or hydrotalcite-like compounds) are not similarly heat treated and hydrated to form such hydrotalcite-like compounds.
1. A hydrotalcite like compound having an XRD pattern which has 2 theta peak positions that reasonably resemble those found in ICDD card 35-965 and one or more metallic oxidants selected from the group consisting of cerium, vanadium, cobalt, copper, platinum, palladium, rhodium, iridium, molybdenum, tungsten, chromium, nickel, manganese, iron, ytterbium and uranium made by a process comprising:
(i) providing a first hydrotalcite like compound;
(ii) heat treating the first hydrotalcite like compound at a temperature up to about 850° C.; and
(iii) hydrating the product of step (ii) to form the hydrotalcite like compound.
2. The hydrotalcite like compound of claim 1 , wherein the hydrotalcite like compound is at least 10% harder and/or at least 10% denser than the hydrotalcite like compound of step (ii).
3. The hydrotalcite like compound of claim 1 , wherein heat treating the hydrotalcite like compound comprising heating at a temperature from about 300° C. to about 850° C.
4. A method for decreasing SO x emissions from an FCC unit comprising adding the hydrotalcite like compound of claim 1 to the FCC unit to reduce the SO x emissions.
5. A hydrotalcite like compound having an XRD pattern which has 2 theta peak positions that reasonably resemble those found in ICDD card 35-965 and one or more metallic oxidants selected from the group consisting of cerium, vanadium, cobalt, copper, platinum, palladium, rhodium, iridium, molybdenum, tungsten, chromium, nickel, manganese, iron, ytterbium and uranium made by a process comprising:
(i) preparing a reaction mixture comprising a magnesium containing compound and an aluminum containing compound;
(ii) heat treating the reaction mixture at a temperature up to about 850° C.; and
(iii) hydrating the reaction mixture to produce the hydrotalcite like compound.