Method for the preparation of a hydrocarbon synthesis catalyst material and the use thereof in a hydrocarbon synthesis process

摘要

This invention relates to a method for the preparation of a hydrocarbon synthesis catalyst material, in the form of a hydrocarbon synthesis catalyst precursor and/or catalyst, preferably, a Fischer Tropsch synthesis catalyst precursor and/or catalyst. The invention also extends to the use of a catalyst precursor and/or catalyst prepared by the method according to the invention in a hydrocarbon synthesis process, preferably, a Fischer Tropsch synthesis process. According to this invention, a method for the preparation of a hydrocarbon synthesis catalyst material includes the steps of treating Fe(II) carboxylate in solution with an oxidizing agent to convert it to Fe(III) carboxylate in solution under conditions which ensure that such oxidation does not take place simultaneously with any dissolution of Fe(0); and hydrolyzing the Fe(III) carboxylate solution resulting from step (iii) and precipitating one or more Fe(III) hydrolysis products.

主权项

1. A method for the preparation of a hydrocarbon synthesis catalyst material in the form of a hydrocarbon synthesis catalyst precursor including the steps of:
i) providing Fe(II) carboxylate In solution; (ii) if the molar ratio of carboxyl and carboxylate groups, which groups have either reacted with iron or are free to do so, to Fe(II) in the solution of step (i) is not at least 3:1, adding a source of a carboxyl or a carboxylate group to the solution to ensure that said molar ratio is at least 3:1 prior to the completion of the oxidation of the Fe(II) carboxylate referred to in step (iii) below; (iii) treating the Fe(II) carboxylate in solution with an oxidising agent to convert it to Fe(III) carboxylate in solution under conditions which ensure that such oxidation does not take place simultaneously with any dissolution of Fe(0); (iv) hydrolysing the Fe(III) carboxylate solution resulting from step (iii) and precipitating one or more Fe(III) hydrolysis products; (v) recovering the one or more hydrolysis products of step (iv); and (vi) adding a source of promoter, in the form of a soluble salt of a transition metal, and a chemical promoter, in the form of a soluble salt of an alkali metal or an alkaline earth metal, during or subsequent to any of the preceding steps in order to produce a catalyst material in the form of a hydrocarbon synthesis catalyst precursor.