Control of catalyst deactivation with ammonia. Quarterly report, March 1, 1986-May 31, 1986. [o-cyclohexylphenol]

Technical Report · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5723940

Satterfield, C N; LaVopa, V

In the last Quarterly Report we presented data on the hyydro-deoxygenation (HDO) of dibenzofuran on a presulfided NiMo/Al/sub 2/O/sub 3/ catalyst at 360/sup 0/C and 7.0 MPa. We showed that, after the catalyst had reached steady state, a remarkable increase in catalyst activity could be achieved by replacing the H/sub 2/ stream with a 50:50 mixture of NH/sub 3/ and H/sub 2/ for 1 hour. During the one-hour treatment the HDO rate dropped, but after NH/sub 3/ was removed and the system returned to pure H/sub 2/, catalyst activity more than doubled over that before the NH/sub 3/ treatment. Although activity then slowly dropped, it was significantly greater than before NH/sub 3/ treatment, even 122 hours later. Having shown that NH/sub 3/ indeed has a marked effect on catalyst activity for the HDO of dibenzofuran (DBF), we are now turning to a more detailed examination of the reaction network of DBF to see if we can identify possible causes. We have had considerable experience with DBF in conjunction with studies under another grant, ''Catalytic Hydrotreatment Studies with Model Compounds,'' DE-FG22-83PC60798. Prior to our work the most detailed study of DBF was that of Krishnamurthy, et al. (1981). They reported that an important intermediate was o-cyclohexylphenol which decomposed thermally. We suspected that this then might be a source of carbonaceous deposits. However in an apparatus studying o-cyclohexylphenol as such, thermal reaction was essentially negligible relative to catalytic reaction. 1 fig., 2 tabs.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA)
• DOE Contract Number: FG22-85PC80516
• OSTI ID: 5723940
• Report Number(s): DOE/PC/80516-3; ON: DE86011588
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010403* -- Coal & Coal Products-- Hydrogenation-- (-1987)
010405 -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
AMMONIA
AROMATICS
BENZOFURANS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL LIQUIDS
COBALT
DATA
DEACTIVATION
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
FURANS
HETEROCYCLIC COMPOUNDS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
HYDROGENATION
HYDROXY COMPOUNDS
INFORMATION
KINETICS
LIQUIDS
METALS
MOLYBDENUM
NICKEL
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHENOLS
REACTION INTERMEDIATES
REACTION KINETICS
RESEARCH PROGRAMS
STRUCTURAL MODELS
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENTS