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US 4,243,554 AGranted
Molybdenum disulfide catalyst and the preparation thereof
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 ammonium thiomolybdate salts at temperatures of about 300.degree.-800.degree. C., with said salts being heated to decomposition temperature at a rate in excess of about 15.degree. C./min., e.g., about 20.degree.-30.degree. C./min., in an essentially oxygen-free atmosphere. 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 an ammonium salt of molybdenum-sulfur cluster anions or an ammonium thiomolybdate salt having the formula (NH.sub.4).sub.2 [MoO.sub.x S.sub.4-x ], where x is from about 0.8 to about 2.2, at a decomposition temperature of from about 300.degree. C. to about 800.degree. C., said salt being heated to the decomposition temperature rapidly at a rate in excess of about 15.degree. C./min. in an essentially oxygen-free atmosphere, said salt decomposing at said temperature to form a high surface area, bulk molybdenum disulfide, MoS.sub.2, having desirable properties for use as a catalyst for water gas shift and methanation reactions and for catalyzed hydrogenation or hydrotreating reactions.
A process for the production of an improved, sulfur resistant catalyst comprising thermally decomposing ammonium thiomolybdate at a decomposition temperature of from about 300.degree. C. to about 800.degree. C., said salt being heated to the decomposition temperature rapidly at a rate in excess of about 15.degree. C./min. in an essentially oxygen-free atmosphere, said salt decomposing at said temperature to form a high surface area, bulk molybdenum disulfide, MoS.sub.2, 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 an ammonium salt of molybdenum-sulfur cluster anions or an ammonium thiomolybdate salt having the formula (NH.sub.4).sub.2 [MoO.sub.x S.sub.4-x ], where x is from about 0.8 to about 2,2, at a decomposition temperature of from about 300.degree. C. to about 800.degree. C., said salt being heated to the decomposition temperature rapidly at a rate in excess of about 15.degree. C./min. in an essentially oxygen-free atmosphere, said salt decomposing at said temperature to form a high surface area, bulk molybdenum disulfide, MoS.sub.2, having desirable properties for use as a catalyst for water gas shift and methanation reactions and/or catalyzed hydrogenation or hydrotreating reactions.
An improved, sulfur resistant catalyst produced by the process comprising thermally decomposing ammonium thiomolybdate at a decomposition temperature of from about 300.degree. C. to about 800.degree. C., said salt being heated to the decomposition temperature rapidly at a rate in excess of about 15.degree. C./min. in an essentially oxygen-free atmosphere, said salt decomposing at said temperature to form a high surface area, bulk molybdenum disulfide, MoS.sub.2, having desirable properties for use as a catalyst for water gas shift and methanation reactions and/or catalyzed hydrogenation or hydrotreating reactions.
Dependencies are inferred from the claim text.