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PREPARATION OF SUPPORTED PALLADIUM MEMBRANE AND SEPARATION OF HYDROGEN
Morooka, Shigeharu,Kusakabe, Katsuki,Aoki, Kanna,Yokoyama, Shuichi 한국화학공학회 1996 Korean Journal of Chemical Engineering Vol.13 No.5
Palladium acetate was sublimed at a reduced pressure at 400℃, carried into the macropores of the porous wall of an α-alumina support tube and was decomposed there. A thin palladium membrane which was thus formed showed a hydrogen permeance of 10^6 ㏖·m ²·s ¹·Pa ¹ and a hydrogen/nitrogen permselectivity higher than 1000. The membrane was stable against hydrogen embrittlement even when the permeation temperature was varied between 100 and 300℃, and it was stable to sulfur or chlorine. To test the ability of this system for the separation of hydrogen and deuterium. a palladium disk was used instead of the prepared membrane since a definite membrane thickness was necessary for calculation. When H₂ and D₂ permeated through the membrane independently, the H/D permselectivity was approximately 7 at 150-200℃ under a feed side pressure of 0.4 MPa and a permeate side pressure of 0.1 MPa. When a mixture of H₂ and D, was fed, the H/D permselectivity was reduced to 1.2-1.6.
Development of A Microchannel Catalytic Reactor System
Kusakade, Katsuki,Morooka, Shigeharu,Maeda, Hideaki 한국화학공학회 2001 Korean Journal of Chemical Engineering Vol.18 No.3
The purpose of this article is to demonstrate the applicability of microreactors for use in catalytic reactions at elevated temperatures. Microchannels were fabricated on both sides of a silicon wafer by wet chemical etching after pattern transfer using a negative photoresist. The walls of the reactor channel were coated with a platinum layer, for use as a sample catalyst, by sputtering. A heating element was installed in the channel on the opposite surface of the reactor channel. The reactor channel was sealed gas-tight with a glass plate by using an anodic bonding technique. A small-scale palladium membrane was also prepared on the surface of a 50-㎛ thick copper film. In the membrane preparation, a negative photoresist was spin-coated and solidified to serve as a protective film. A palladium layer was then electrodeposited on the other uncovered surface. After the protective film was removed, the resist was again spin-coated on the copper surface, and a pattern of microslits was transferred by photolithography. After development, the microslits were electrolitically etched away, resulting in the formation of a palladium membrane as an assemblage of thin layers formed in the microslits. The integration of the microreactor and the membrane is currently under way.
Hidaka, Nobuyuki,Matsumoto, Toshitatsu,Kusakabe, Katsuki,Morooka, Shigeharu 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.6
Coarse particles of glass or cokes were packed in vertical columns, 1- and 2-m in height, and fine particles of glass or coke were entrained through the columns by the ascending gas flow. These systems were used as a model to investigate the flow of fine coal particles introduced into a blast furnace. The effects of properties of packed particles, as well as fines, on the static and dynamic holdups of fines were then investigated. The static holdup of fines was strongly affected by the surface roughness of the packed particles, while the dynamic holdup of fines was not. These results suggest that the fine particles are trapped in the form of static holdup in the isolated narrow spaces bounded with packed particles, and that they remain on the surface of the packed particles which are exposed to the gas flow for only a short period of time.