Ni catalysts supported on Al 2 O 3 , as received commercially and subjected to sintering at 723–973 K, were characterised in terms of distinct magnetic structures. It was found that the Ni on all the catalysts consisted of a mixture of single domain structures, with and without anisotropic effects, and multidomain (ferromagnetic) structures. The formation of the multidomain particles during the sintering process coincides with a decrease in catalytic activity for the reaction CO+3H 2 °CH 4 +H 2 O. From this study it was concluded that the methanation reaction is ‘magnetic‐structure’ sensitive.
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Everson et al. (1979) studied this question.