Issue 11, 1985

Adsorption and catalytic properties of CoxFe3–xO4 spinels. Part 2.—Hydrogen chemisorption on precursors to ammonia synthesis catalysts

Abstract

At temperatures in the range 323–423 K H2 adsorbs largely irreversibly onto the surfaces of CoxFe3–xO4(0 ⩽x⩽ 3) spinels to an extent (0.91–4.76 molecules nm–2) which increases with x and temperature. Although the enthalpy of adsorption (60–210 kJ mol H2) is greater than bulk spinel reduction at these temperatures the latter process is not thought to be significant. Adsorption isotherms obey the Langmuir model well. Crystal-field considerations suggest sites responsible for adsorbing H2 which are contrary to recent reports (J-P. Beaufils, Y. Barbaux and B. Saubat, J. Chem. Soc., Chem. Commun., 1982, 1212). Cobalt additions improve the extent and enthalpy of the fast adsorption of hydrogen on these spinel precursors of non-promoted ammonia-synthesis catalysts.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans. 1, 1985,81, 2593-2603

Adsorption and catalytic properties of CoxFe3–xO4 spinels. Part 2.—Hydrogen chemisorption on precursors to ammonia synthesis catalysts

R. R. Rajaram and P. A. Sermon, J. Chem. Soc., Faraday Trans. 1, 1985, 81, 2593 DOI: 10.1039/F19858102593

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