Ada, Kezban2020-06-252020-06-252008closedAccess0970-7077https://hdl.handle.net/20.500.12587/4189In order to investigate the effect of preparation procedure for precursors on some physico-chemical properties of powders, three alumina precursors were prepared by different ways. The first precursor (P1) was precipitated by adding ammonia to the boiling aluminium sulphate solution buffered by NH3/NH4Cl (pH = 9.25). The second precursor (P2) was precipitated by the reaction between aluminium sulphate and excess urea in boiling aqueous solution (pH = 3.42). The third precursor (P3) was precipitated by the similar reaction in boiling aqueous solution buffered by C2H4(COOH)(2)/C2H4(COONH4)(2) (pH = 4.16). Three different alumina powders (P1, P2 and P3) were obtained by the calcination of the precursors at 1000 degrees C for 2 h. The powders were examined by scanning electron microscopy and nitrogen adsorption-desorption techniques. The BET specific surface areas (A) and specific micro-mesopore volumes (V) for the powders (P1, P2 and P3) were obtained as 116 m(2) g(-1) and 0.34 cm(3) g(-1), 66 m(2) g(-1) and 0.15 cm(3) g(-1) and 148 m(2) g(-1) and 0.59 cm(3) g(-1), respectively. The surface areas of the powders determined by other methods, are compared with the BET values.eninfo:eu-repo/semantics/closedAccessaluminamorphologypore volumeprecursorsurface areaArticle204325932662-s2.0-54049152895Q4WOS:000259602400104Q4