Measuring and testing – Particle size
Patent
1997-07-23
1999-06-01
Dombroske, George
Measuring and testing
Particle size
73 38, G01N 1500
Patent
active
059089938
ABSTRACT:
According to the present invention, there is provided an apparatus for measuring total surface area of a portion of catalytic metal particles carried on the surfaces of pores in a carrier of a catalyst, comprising a device for supplying the pores with a first gas under a predetermined pressure to mask the surfaces of the catalytic metal particles carried on a first portion of the surfaces of said pores, which first portion has a radius less than a radius determined by the predetermined pressure of said first gas and a device for supplying said pores with a second gas which is to be adsorbed on the surfaces of said catalytic metal particles carried on a second portion of the surfaces of said pores, which second portion has a radius equal to or greater than the radius determined by the predetermined pressure, and is not masked by said first gas. Also included is a processor for calculating total surface area of said catalytic metal particles carried on said second portion of the surfaces of said pores by an amount which is adsorbed on said surfaces of said catalytic metal particles.
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Gruber, Hans L. An Adsorption Flow Method for Specific Metal Surface Area Determination. Analytical Chemistry, vol. 34, No. 13, (Dec. 1962), pp. 1828-1831.
Loebenstein, William V., and Dietz, Victor R. Surface-Are Determination by Adsorption of Nitrogen from Nitrogen-Helium Mixtures. Journal of Research of the National Bureau of Standards. vol. 46, No. 1 (Jan. 1951), pp. 51-55 .
Takeshima Shinichi
Tanaka Toshiaki
Amrozowicz Paul D.
Dombroske George
Toyota Jidosha & Kabushiki Kaisha
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