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US 4,243,553 AGranted
Production of improved molybdenum disulfide catalysts
AssigneeUnion Carbide Corporation
InventorsAlfred W. Naumann, Albert S. Behan
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AssigneeUnion Carbide Corporation
InventorsAlfred W. Naumann, Albert S. Behan
Estimating the term…
High surface area molybdenum disulfide, MoS.sub.2, is produced by the thermal decomposition of selected substituted ammonium thiomolybdate salts at temperatures of about 300.degree.-800.degree. C., with said salts being heated to decomposition temperature slowly, in an essentially oxygen-free atmosphere, through the temperature interval in which the substantial portion of the particular substituted ammonium thiomolybdate salts decompose. The product molybdenum disulfide has superior catalytic properties for the water gas shift and methanation reactions compared with conventional MoS.sub.2. The stability of the catalyst is enhanced by decomposing the thiomolybdate salt in admixture with an inert, preformed particulate diluent or by bulk doping said salt with tungsten or vanadium prior to decomposition of the salt. The molybdenum disulfide of the invention also has desirable properties for use in catalyzed hydrogenation and hydrotreating reactions, i.e., hydrodenitrogenation and hydrodesulfurization reactions, particularly when employed in nickel or cobalt-promoted form.
A process for the production of improved, sulfur resistant catalysts comprising thermally decomposing a thiomolybdate salt having the formula B.sub.2 [MoO.sub.x S.sub.4-x ], where B is a substituted aliphatic ammonium or a cyclic amine containing one or more basic N atoms, and x is 0, 1 or 2, at a decomposition temperature of from about 300.degree. C. to about 800.degree. C., said substituted ammonium thiomolybdate salt being heated to said decomposition temperature slowly, in an essentially oxygen-free atmosphere, through the temperature interval in which a substantial portion of said substituted ammonium thiomolybdate salt decomposes, said salt decomposing to form a molybdenum disulfide, MoS.sub.2, product having desirable properties for use as a catalyst for water gas shift and methanation reactions and for catalyzed hydrogenation or hydrotreating reactions.
An improved, sulfur resistant catalyst produced by the process comprising thermally decomposing a thiomolybdate salt having the formula B.sub.2 [MoO.sub.x S.sub.4-x ], where B is a substituted aliphatic ammonium ion or a cyclic amine containing one or more basic N atoms, and x is 0, 1 or 2, at a decomposition temperature of from about 300.degree. C. to about 800.degree. C., said substituted ammonium thiomolybdate salt being heated to the decomposition temperature slowly, in an essentially oxygen-free atmosphere, through the temperature interval in which molybdate salt decomposes, said salt decomposing to form a molybdenum disulfide, MoS.sub.2, product having desirable properties for use as a catalyst for water gas shift and methanation reactions and for catalyzed hydrogenation or hydrotreating reactions.
Dependencies are inferred from the claim text.