DATA FROM TEMPERATURE-PROGRAMMED DESORPTION (TPD) TO CHECK NEW ASPECTS OF AMMONIA-SYNTHESIS ON IRON CATALYSTS 1 THE TPD OF ADSORBED HYDROGEN ON IRON CATALYSTS AND ACTIVE STATES
- 数学科学－已发表论文 
The temperature-programmed desorption spectra of hydrogen on K2OCaO OAl2O3Fe, CaOAl2O3Fe, Al2O3Fe catalysts at normal atmospheric pressure and various temperatures have been obtained. Desorption peaks are observed in three temperature intervals, namely, 120–170, 280–380, and 480–540 °C. Having studied the changes in the TPD spectra effected by adsorbed nitrogen, promoters, and adsorption conditions, we characterized these peaks as H2δ+, Hδ+, and Hδ−, respectively. The effect of promoters and dipole-dipole mutual interaction energy have been estimated. The dynamically induced adsorption models for the synthesis of ammonia on doubly promoted iron catalysts proposed by K. H. Huang (“Proceedings, 7th International Congress on Catalysis,” p. 554, 1981; Sci. Sin. 24, No. 6 (1981); Universitis Amoiensis (Acta Sci. Natur.) 3, 112, 130 (1978)) have been further supported and extended. The adsorption equilibrium constants have been estimated using a statistical thermodynamic method. The results established that (KH2PH2)Hδ+ and (KH2PH2)H2+δ are much less than unity as was assumed in the previous derivation of the kinetic equation (K. H. Huang, Sci. Sin. 24, No. 6 (1981)). This equation has been proved.