3499.     TURKEVICH, J.  Electron Microscopy of Catalysts.  Jour. Chem. Phys., vol. 13, No. 6, 1945, pp. 235-239.

        Number of electron micrographs are presented:  Pt oxide, Adams Pt catalyst, platinized asbestos, the same sintered, activated alumina, active silica gel, alumina silicate cracking catalyst, Zn oxide MeOH catalyst, and a Fischer catalyst of Ni-ThO₂ supported on kieselguhr.  The kieselguhr is seen to be composed of diatoms, which are particles full of holes 1,300 A diam.  These openings offer a large surface for support of the Ni and ThO₂.

        ----------.  See abs. 3395, 3395a.