The joint application of flow-system and micropulse techniques for a comparative study of 2-propanol decomposition over MgO, CaO and SrO

Z. G. Szabó, B. Jóvér, R. Ohmacht

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36 Citations (Scopus)

Abstract

MgO, CaO and SrO were prepared by the same procedure from pure hydroxides. Flow-system catalytic activity measurements of 2-propanol decomposition were carried out at various temperatures and pressures of alcohol. Over each oxide the only reaction to occur was dehydrogenation. The kinetic parameters of the process, determined from the relation W = A · e -E RT · pn, were: {A table is presented} The order of the reaction was zero in each case. To supplement the above measurements micropulse experiments were carried out using pulses of the reactant smaller than required for monolayer covering of the BET surface. The main conclusions obtained by this technique were: 1. a. The lack of dehydration activity is not a consequence of dehydration sites being blocked by water, since there was no detectable amount of propylene, even in the first pulses desorbing from the surface. 2. b. With MgO it is the alcohol, while with CaO and SrO the acetone that adsorbs strongly, blocking a considerable amount of the originally active surface (which itself is a smaller part of the total BET surface only). A semiquantitative calculation is performed to explain the results on the basis of a likely mechanism.

Original languageEnglish
Pages (from-to)225-233
Number of pages9
JournalJournal of Catalysis
Volume39
Issue number2
DOIs
Publication statusPublished - Aug 1975

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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