M. Subrahmanyam et al., REACTION OF N-(2-HYDROXYETHYL)ETHYLENEDIAMINE OVER ZEOLITE AND CHROMITE CATALYSTS, Reaction kinetics and catalysis letters, 49(2), 1993, pp. 455-459
N-(2-hydroxyethyl)ethylenediamine reaction was observed over zeolite c
atalysts giving rise to only dehydrocyclization and over chromite cata
lysts showing dehydrocyclization together with dehydrogenation. The ma
jor product changes from the cyclized compound piperazine to pyrazine
when the reactant is switched from zeolite to chromite catalyst. This
process stands as a model reaction for characterizing lone acid sites
and adjacent acid-base sites over zeolite and chromite catalysts, resp
ectively.