Synthesis of nanostructured γ-alumina with a cationic surfactant and controlled amounts of water

• DOI: 10.1016/j.micromeso.2004.10.021
• Publication Date: 2004-12-16T20:34:57Z
• Authors: Hyun Chul Lee; Hae Jin Kim; Chang Houn Rhee; Kyung Hee Lee; Jae Sung Lee; Soo Hyun Chung
• Keywords: hydrothermal synthesis; ASSISTED SYNTHESIS; nanostructured; ORGANIZED MESOPOROUS ALUMINA; METAL-OXIDES; MOLECULAR-SIEVES; mesoporous; alumina; 01 natural sciences; surfactants; 0104 chemical sciences

Abstract Nanostructured crystalline γ-alumina was synthesized by a simpler and improved method proposed here from aluminum alkoxide precursor in the presence of a cationic surfactant and controlled amounts of water under hydrothermal conditions without any extra additives such as hydrolysis controlling agents. The material synthesized with a stoichiometric amount of water (H 2 O/Al = 2) was a mesoporous molecular sieve with a ‘wormhole-like’ pore structure. With increasing amounts of water (H 2 O/Al = 10 or 20), bundles of γ-alumina nanofibers were formed, and with H 2 O/Al > 20, materials with no definite morphology were formed, probably due to too fast hydrolysis of the precursor. The nanostructured materials had high surface areas and a good thermal stability.