Comparative loss of alkali promoter by desorption from two catalysts for the dehydrogenation of ethyl benzene to styrene
作者： Klas Engvall , Leif Holmlid , P. Govind Menon
DOI: 10.1016/0166-9834(91)80068-8
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摘要: Abstract Using molecular-beam and mass-spectrometric methods, the comparative desorption of potassium as K atoms excited-state (K2*) species was studied from two commercial iron oxide catalysts (A B, which latter known to be superior) for styrene process. The B only observed at temperatures considerably higher than that A. measured activation energy values emission are: (a) atoms, 1.0 eV (96 kJ/mol) 3.1 (300 A resp.; (b) K2* species, 1.7 (160 0.84 (81 resp. temperature ranges where these are (A) 830-920 K, (B) 970-1090 810-1060 910-1060 K. lower barrier excited state may perhaps responsible better more stable performance this catalyst in states here believed formed also under normal operating conditions on surfaces.
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