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

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

Author
Satterfield, C. N.
Published
United States : [publisher not identified], 1986
Springfield, Va.: National Technical Information Service, [approximately 1986]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
LaVopa, V.

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Summary
In the last Quarterly Report we presented data on the hyydro-deoxygenation (HDO) of dibenzofuran on a presulfided NiMo/Al2O3 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 H2 stream with a 50:50 mixture of NH3 and H2 for 1 hour. During the one-hour treatment the HDO rate dropped, but after NH3 was removed and the system returned to pure H2, catalyst activity more than doubled over that before the NH3 treatment. Although activity then slowly dropped, it was significantly greater than before NH3 treatment, even 122 hours later. Having shown that NH3 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.
Report Numbers
DE86011588; DOE/PC/80516-3
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: FG22-85PC80516
OSTI Identifier 5723940
Research organization: Massachusetts Inst. of Tech., Cambridge (USA).
View MARC record | catkey: 47366416