Composite catalyst activity from component coking

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6124651

Dean, J W

Deactivation of a composite acid catalyst during cracking of n-hexadecane was studied using an apparatus consisting of a thermogravimetric analysis (TGA) system operating as a pulse microreactor followed by a gas chromatograph. The composite catalyst, which contains a silica-alumina component and a zeolite component, was compared to the separate, catalytically active, components with respect to activity as a function of coke lay-down. Pretreatment of each component and the composite catalyst was conduced using a helium-heat treatment and a steaming treatment. The untreated zeolite was also tested for comparison of the pretreatment effects. A test was designed and used to compare flow hydrodynamics in different TGAs, used as pulse microreactors. The test involves passing a pulse of injectant over the sample pan containing an adsorbent. The technique is performed in the pulse mode is a similar manner to the deactivation studies and is insensitive to variations in temperature. The test is useful for comparing TGA extent-of-conversion data in this study to similar measurements taken from other reactor configurations, flow rates, and flow geometries. The technique should also prove useful for comparing results of other gas/solid catalytic reactions performed by TGA. A comparison of activity versus surface area and activity versus sample acidity was made. The results of this comparison were found to be consistent with the proposed deactivation model. Several deactivation models were tested and a suitable approach was developed which allows for Partitioned Flow of reactant from the silica-alumina matrix, in the composite catalyst, to the zeolite.

• Research Organization: West Virginia Univ., Morgantown, WV (USA)
• OSTI ID: 6124651
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ADSORPTION
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AMMONIA
CATALYSTS
CATALYTIC CRACKING
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMICAL REACTORS
CHEMISORPTION
CHROMATOGRAPHY
COKE
COMPARATIVE EVALUATIONS
CRACKING
DEACTIVATION
DECOMPOSITION
DEPOSITION
ELEMENTS
FLUIDS
GAS CHROMATOGRAPHY
GASES
GRAVIMETRIC ANALYSIS
HEAT TREATMENTS
HELIUM
HEXADECANE
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIAL BALANCE
MATERIALS
MATHEMATICAL MODELS
MINERALS
NITROGEN
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
RARE GASES
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
STEAM
SURFACE AREA
SURFACE PROPERTIES
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES
ZEOLITES