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- W289667415 abstract "Experiments a re reported on the rate of reduction of nickel oxide pellets with hydrogen over the temperature range 200 ~ to 900~ Measurements were also made of the pore size distribution of the reacted and unreacted specimens by mercury porosimetry. In addition, the size of the individual grains was also determined by X-ray diffraction techniques and by electron microscopy. These physical measurements supplied most of the information required for the comparison of reduction rates with the predictions made in Part I of this study. It was found that the trends predicted by the structural model were consistent with measurements, thus the structural model shows promise both for the interpretation of experimental data and for the semiquantitative prediction of experimental behavior. T IN the preceding paper a mathematical model was presented for the reaction of porous metal oxides with a reducing gas. The model incorporated structural parameters, such as grain size, porosity and true pore diffusivity, which could be measured or predicted independently of the reduction process. It was suggested, therefore, that if the true heterogeneous rate constant were known, then the overall reaction rate could be predicted on the basis of the model and independent physical measurements. The purpose of the present paper is to describe an experimental study, involving the system: nickel oxidehydrogen, aimed at examining the appropriateness of the structural model presented previously. In the following, experimental measurements will be presented on the kinetics of the reaction of porous nickel oxide pellets with hydrogen under controlled conditions. Also described will be independent measurements carried out for the characterization of the porous solid; these latter data are used in computing the theoretical results which are then compared with experimental measurements. Regarding the organization of the paper, Section 1 is coacerned with the experimental technique used in the reduction studies, and the measurements characterizLug the porous solids are reported in Section 2. The measured and the predicted reaction rates are compared in Section 3 for a variety of conditions, and" @default.
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- W289667415 date "1971-01-01" @default.
- W289667415 modified "2023-09-24" @default.
- W289667415 title "Studies in Gas-Solid Reactions: Part II. An Experimental Study of Oxide Reduction with Hydrogen Nickel" @default.
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