Water-gas shift reaction over chromia-promoted magnetite. Use of temperature-programmed desorption and chemical trapping in the study of the reaction mechanism |
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| Authors: | C Diagne P J Vos A Kiennemann M J Perrez and M F Portela |
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| Institution: | (1) Laboratoire de Chimie Organique Appliquée, EHICS, UA CNRS 469, 1, rue Blaise Pascal, 67008 Strasbourg, France;(2) GRECAT, IST, Av. Rovisco Pais, 1000 Lisboa, Portugal |
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| Abstract: | The mechanism of WGSR has been studied on an Fe–Cr catalyst. Although after reaction (from 250 to 400°C) formate species have been characterized on the Fe–Cr catalyst, by chemical trapping, TPD studies after reaction and after HCOOH adsorption have shown that formates are not the main intermediates. The disproportionation of CO or the regenerative mechanism seems to be more probable.
                CO+H2O CO2+H2  Fe–Cr.    ( 250 400°C)    Fe–Cr       , ,    ,  .  CO   .
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