Catalyst deactivation in hydrotreating coal-derived liquids

Conference · Mon Jan 01 04:00:00 EST 1979 · Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States)

OSTI ID:5205570

Sivasubramanian, R ^[1]; Olson, J H; Katzer, J R

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1. Univ. of Delaware, Newark

Ni-Mo/Al/sub 2/O/sub 3/ catalysts aged in hydrotreating coal-derived liquids were characterized by scanning electron microscopy, electron microprobe, and catalytic activity. Aged catalyst from three different sections of the trickle-bed reactor used for the hydroprocessing were plasma etched to remove the carbon coating and were then examined. An inner crust and an outer crust were observed on the exterior of the catalyst particles; the inner crust was not present on catalyst near the reactor exit. The inner crust was composed principally of titania; whereas the outer crust contained ferrous sulfide, silica, and traces of other metals. Titania was also deposited within the interior of the catalyst. The activities of fresh, aged, and regenerated (coke burnt off) catalysts were compared for hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) using a mixture of dibenzothiophene and quinoline in n-hexadecane in a batch autoclave reactor. The aged catalyst was inactive for HDN and had very low activity for HDS. Burning the carbon off the catalyst resulted in approximately 60% recovery of the HDN activity and 50% recovery of the HDS activity compared to that of the fresh catalyst. Pseudo first-order rate constants were determined for each of the reactions in the quinoline and dibenzothiophene reaction networks.

• OSTI ID: 5205570
• Report Number(s): CONF-800303-P4
• Conference Information: Journal Name: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States) Journal Volume: 25:1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ANTHRACENE
AROMATICS
AZINES
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL LIQUEFACTION
COAL LIQUIDS
CONDENSED AROMATICS
DATA
DATA FORMS
DEACTIVATION
ELECTRON MICROPROBE ANALYSIS
ELECTRON MICROSCOPY
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGENATION
INFORMATION
LIQUEFACTION
METALS
MICROANALYSIS
MICROSCOPY
MOLYBDENUM
NICKEL
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PYRIDINES
QUINOLINES
REFRACTORY METALS
REGENERATION
SYNTHOIL PROCESS
TABLES
THERMOCHEMICAL PROCESSES
THIONAPHTHENES
TRANSITION ELEMENTS