Open AccessA study on the Deactivation of Usy Zeolites with Different Rare Earth Contents
Author(s) -
Cristiane A. Henriques,
José-Marı́a Santos,
Carla Maria Salerno Polato,
M. L. Murta Valle,
Eduardo Falabella Souza Aguiar,
J.L.F. Monteiro
Publication year - 1998
Publication title -
brazilian journal of chemical engineering/brazilian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.313
H-Index - 52
eISSN - 1678-4383
pISSN - 0104-6632
DOI - 10.1590/s0104-66321998000200003
Subject(s) - coke , rare earth , catalysis , chemistry , fluid catalytic cracking , selectivity , cracking , chemical engineering , inorganic chemistry , mineralogy , organic chemistry , engineering
The deactivation of USY zeolites with different rare earth contents due to the coke formed from n-heptane at 450oC was studied. The results show that the presence of rare earth elements decreases the cracking and coking activities, increasing catalytic stability. However, reaction selectivity was not significantly influenced. The greater the rare earth content, the lower the coking rates and the coke contents. The TPO/DSC profiles suggested that the catalytic effect of the rare earth elements promoted coke oxidation