By W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.)

(from preface)Advances in Catalysis is now getting into its 5th 12 months. it truly is, within the editors' opinion, an encouraging and demanding proven fact that the previous volumes are discovering expanding use in medical and commercial laboratories and that the Advances are usually quoted as literature resources on a number of issues of catalysis.Thus, the editors current this 5th quantity with self assurance that it too could serve the aim of absolutely informing these or energetic in catalytic experiences on medical and functional development during this field.In the present quantity numerous matters is taken care of by means of efficient authors. those topics take care of new options of floor investigations with the microbalance, with the elucidation of response mechanisms via the idea that of intermediates, and with really expert stories of the ammonia synthesis, hydrogenations, carbon monoxide oxidation and hydrocarbon syntheses. additionally, quantity V comprises an intensive serious evaluate of Russian literature in catalysis.

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The same procedure as that used for obtaining the low-pressure adsorption isotherms with nitrogen described in reference (28) was used. When plotting the values obtained on a graph, the points fall on a straight line indicating Langmuir type adsorption (Fig. 11). As the third point in Fig. 11 is equivalent to roughly 5% of the monolayer, this is most easily understood if the adsorption takes place rather unselectively on the whole surface. The adsorption isotherm up to 200 mm. Hg was completed and afterwards thc sample was evacuated.

A generally appropriate reduction schedule cannot be prescribed because different types of catalysts call for different reduction procedures to reach their most active state. It has previously been mentioned that the promoters used in ammonia catalysts have a retarding effect on the reduction. According to the author's experience, oxides of the alkaline earth metals, especially CaO, make the catalysts especially difficult to reduce. As will be remembered these oxides enter the magnetite matrix readily.

78 (1) Formation Techniques . . . . . . . . . . 79 (2) Structural Properties . . . . . . . . . . 82 (3) Additional Considerations . . . . . . . . . 83 e . Contamination Control . . . . . . . . . . . 84 I . Microbalance Applications . . . . . . . . . . . . . * Present address. E . I . , Wilmington. Delaware . 40 T. N. RHODIN, JR. Page 11. Low-Temperature Studies. . . . . . . . . . . . 85 1. Surface Characterization. . .

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