A METHOD FOR MAKING A CATALYST PRECURSOR WITH AN ENHANCED HYDROTHERMAL STABILITY

摘要

The present invention relates to a method for making a catalyst precursor with an enhanced hydrothermal stability, comprising: a)shaping a material comprising a crystalline hydrous alumina precursor to form a shaped alumina precursor material in the form of particles with a desired average particle size, wherein the crystalline hydrous alumina precursor comprises at least one crystalline boehmite having an average crystallite size from about 4 nm to about 30 nm or comprises at least one crystalline bayerite; b)optionally, treating the shaped alumina precursor material to a temperature not exceeding about 350°C so as to retain a substantial portion of the crystalline hydrous alumina precursor; c)contacting the shaped alumina precursor material containing the crystalline hydrous alumina precursor with at least one structural stabilizer or a compound thereof; d)calcining the shaped alumina precursor material in the presence of the at least one structural stabilizer or compound thereof under suitable conditions to effect the conversion of the crystalline hydrous alumina precursor to a stabilized aluminum oxide structure and to generate a stabilized catalyst support; and e)applying a catalytic metal or a compound thereof to said stabilized catalyst support to form the catalyst precursor, wherein the catalytic metal comprises a Group 8 metal, Group 9 metal, Group 10 metal, or combinations thereof.