Preparation and characterization of supported alumina membranes for gas separation

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:213146

Huang, Ting-Chia; Chen, Huey-Ing ^[1]

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1. National Chen Kung Univ., Tainan (Taiwan, Province of China)

The preparation and characterization of gas-separative alumina membranes have been studied in this work. The boehmite sol and the porous support were prepared separately, and the supported membrane was obtained by dipping procedure. For the preparation of boehmite sols by sol-gel process, the parameters including water/alkoxide ratio, acid/alkoxide ratio, alcohol amount, hydrolysis temperature, and calcination condition were investigated. For the fabrication of alumina supports, the influence of PVA on the microstructure of the support was studied. The permeation of H{sub 2}, He, CH{sub 4}, N{sub 2}, O{sub 2} and CO{sub 2} through the supported membranes was also studied. The experimental results indicated that acid/alkoxide ratio and calcination temperature play important roles on controlling the size of boehmite sol, and the surface area and pore size of the {gamma}-alumina membrane. The amount of PVA can control the porosity of a support but not change the microstructural property significantly. The permeation results showed that the transport mechanism was primarily described by Knudsen diffusion. Consequently the estimated ideal separation factors for several mixtures were limited by the ratios of molecular weights of gases. The preparation parameters, microstructure, and gas permeation properties of supported alumina membranes have been related rudimentarily. It will be helpful for the forecoming work on the modification of membranes.

• OSTI ID: 213146
• Report Number(s): CONF-940713--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ALUMINIUM OXIDES
CARBON DIOXIDE
CATALYST SUPPORTS
CHEMICAL PREPARATION
GASES
HELIUM
HYDROGEN
MEMBRANES
METHANE
MICROSTRUCTURE
NITROGEN
OXYGEN
PERMEABILITY
PORE STRUCTURE
POROUS MATERIALS
SEPARATION PROCESSES
SOLS
SYNTHESIS