Korea Advanced Institute of Science and Technology

Seung-Bin Park

Seung-Jin Lee

Seung-Man Yang

Yun-Chan Kang

Sang-Yon Lee

An aerosol generator for producing fine droplets in large quantities is used in an apparatus which can produce small particles having a high degree of crystallization and large surface area. The aerosol generator includes a chamber having a porous filter and a solution, and air is supplied to an upper side of the filter. A low pressure driving force, such as by a vacuum, is supplied to the chamber below the filter to generate droplets. A pyrogenetic reactor dries and pyrolyzes the droplets produced by the aerosol generator to give ultrafine particles and an ultrafine particle collector collects the ultrafine particles obtained by the pyrogenetic reactor. The low pressure driving force moves the droplets through the pyroletic reactor.

Aerosol generator and apparatus producing small particles

The present invention relates to a process for preparing a composite inorganic membrane for hydrogen separation, more specifically, to a process for preparing a composite inorganic membrane for hydrogen separation which comprises formation of intermediate layer in an asymmetric porous alumina support by sol-gel method, and modification of pores of the alumina membrane by soaking palladium acetate solution into the pores and vapor-deposition to enhance the permeability and selectivity for hydrogen. A process for preparing an inorganic membrane for hydrogen separation comprises the steps of: (i) dip-coating an alumina support in alumina sol containing a palladium precursor which is uniformly dispersed while vacuumizing the inside of the support, to form an intermediate layer of thin palladium impregnated alumina membrane; (ii) soaking the membrane obtained in step(i) in the palladium precursor solution, drying it under vacuum for 2 to 4 hours, and vaporizing the soaked materials with the gradual increase of temperature up to 170.degree. to 190.degree. C. for the vaporized palladium precursor to be deposited onto the pores; and, (iii) heating the alumina membrane whose pores are deposited with palladium at 290.degree. to 310.degree. C. while vacuumizing the inside of the support.

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Taejon, South Korea

Seung-Bin Park