METHOD OF OBTAINING MULTIMETALLIC OXIDES DERIVED FROM HYDROTALCITE-TYPE COMPOUNDS

摘要

The invention relates to a method of preparing multimetallic hydrotalcites, the physicochemical characteristics thereof and the use of same as sulphur oxide (SOx) reducing materials, such as SO2 or SO3 which are contained in gaseous streams, particularly in flue gases emitted by the regeneration section of the fluid-bed catalytic cracking process. The inventive method improves the SOx absorption capacity per unit of specific area of multimetallic hydrotalcite obtained and the absorption and regeneration spee ds of the calcination products of the aforementioned hydrotalcites, with the incorporation of ternary and/or quaternary cations in the laminae of said precursor materials. In order to discover the effect of the composition of said hydrotalcites, a combination of physical and chemical methods were applied such as to characterise same by means of X-ray diffraction, textural analysis, CO2 absorption microcalorimetry and, primarily, SO2 oxidation reduction.