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The influence of the diffusional phenomena on the apparent kinetics for nth‐order gas‐solid non‐catalytic reactions is studied assuming the unreacted‐core model. Flat‐plate, cylindrical and spherical particles are considered, the size of which may vary with extent of reaction. Specific methods of contacting of fluid with solid are taken into account, but their influence on the results are not remarkable. At high conversions of cylindrical and spherical particles, the process is always chemical reaction controlled.

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