Recovery of Alkylation Activity in Deactivated USY Catalyst Using Supercritical Fluids: A Comparison of Light Hydrocarbons

Journal Article · Sat May 01 00:00:00 EDT 2004 · Applied Catalysis A: General

DOI:https://doi.org/10.1016/j.apcata.2003.11.030· OSTI ID:912212

Ginosar, Daniel M; Thompson, David N; Burch, Kyle C

Off-line, in-situ alkylation activity recovery from a completely deactivated solid acid catalyst was examined in a continuous-flow reaction system employing supercritical fluids (SCF). A USY zeolite catalyst was initially deactivated during the liquid phase alkylation of butene with isobutane in a single-pass reactor and then varying amounts of alkylation activity were recovered by passing supercritical fluids over the catalyst bed. A comparison of reactivation fluids on catalyst activity recovery is reported. Fluids examined included helium, propane, n-butane, isobutane, n-pentane, and isopentane. Phases studied included gas, liquid, and supercritical. As much as 82% of the fresh catalyst activity was recovered when employing supercritical isobutane. The ability of the fluid to facilitate a hydride reaction with the adsorbed deactivating high-molecular weight carbocations was indicated as an important property necessary to attain high levels of catalyst activity recovery. Activity recovery utilizing supercritical fluids that enhance reactivation by both reacting with and desorbing fouling compounds appears to be a promising technique to advance solid catalyst alkylation.

• Research Organization: Idaho National Lab. (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: DOE - FE
• DOE Contract Number: DE-AC07-99ID-13727
• OSTI ID: 912212
• Report Number(s): INEEL/JOU-03-00893; TRN: US0800319
• Journal Information: Applied Catalysis A: General, Vol. 262, Issue 2
• Country of Publication: United States
• Language: English

Related Subjects

22 - GENERAL STUDIES OF NUCLEAR REACTORS, 38 - RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
2-METHYLBUTANE
2-METHYLPROPANE
ALKYLATION
BUTENES
CATALYSTS
FOULING
HELIUM
HYDRIDES
HYDROCARBONS
PROPANE
ZEOLITES
Alkylation
Isoparaffin
Reactivation
Regeneration
Solid acid catalyst
Supercritical fluid
Trimethylpentane