The use of microcalorimetry to investigate the effects of aging on acidity of FCC

Conference · Tue Oct 01 04:00:00 EDT 1996

OSTI ID:370739

Occelli, M L; Auroux, A; Baldiraghi, F; Leoncini, S ^[1]

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1. Georgia Institute of Technology, Atlanta, GA (United States)

Steam-aging (at 815{degrees}C/5 h with 100% steam) is a procedure capable of reducing the physical properties (surface area, pore volume and crystallinity) of certain fresh FCC to those observed in the equilibrium samples. These results explain only in part the similarities in microactivity test (MAT) results (during gas oil cracking) obtained with steamed and equilibrium FCC. In the present paper, microcalorimetry experiments, with ammonia and pyridine as probe molecules, have been used to investigate the effects of thermal and hydrothermal treatments on the acidity of a commercially available FCC. Results have been compared with those generated from an equilibrium sample of the same catalyst obtained from a European refinery. Steaming drastically reduces the sorption capacity for the probe molecules used as well as the FCC acid site density. The acid site density and strength of the equilibrium FCC does not deviate significantly from that of the catalyst prior to MAT evaluation indicating that the steaming procedure used reduces the physical as well as the acidic properties of the fresh catalyst to those of the corresponding equilibrium sample.

• OSTI ID: 370739
• Report Number(s): CONF-960376--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
AMMONIA
CATALYSTS
CATALYTIC CRACKING
CHEMICAL PROPERTIES
MOLECULES
PHYSICAL PROPERTIES
SORPTION
SURFACE AREA