Surface Water Content of Metal Oxides. II. Measurement of Samples Containing Pores: Silica, Alumina and Silica-Alumina

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Two essentially different methods for determining surface water content, <I>i.e.</I>, a successive-ignition-loss method and chemical reaction of active hydrogen with methylmagnesium iodide, were applied to the measurement of samples containing pores: silica, alumina, and silica-alumina. It was found that the rate of reaction of methylmagnesium iodide with active hydrogen largely depends upon the pore size distribution. It took 20 min for completion of the reaction on the Aerosil sample having no pores, <I>ca.</I> 1 hr for alumina and silica-alumina which have peaks in the pore size distribution curve at radii 53 and 37 Å, respectively, and 17 hr for porous silica glass and silica gel which have peaks at radii 22 and 19 Å, respectively. The results obtained by the two methods were in good agreement with each other irrespective of the existence of pores in the transitional range. It was confirmed that the nature of the sample is decisive for the population of water content on metal oxides.
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