Patents by Inventor John G. Tsikoyiannis
John G. Tsikoyiannis has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5563314Abstract: There is provided a process for the net catalytic oxidative dehydrogenation of alkanes to produce alkenes. The process involves simultaneous equilibrium dehydrogenation of alkanes to alkenes and combustion of the hydrogen formed to drive the equilibrium dehydrogenation reaction further to the product alkenes. In the present reaction, the alkane feed is dehydrogenated over an equilbrium dehydrogenation catalyst in a first reactor, and the effluent from the first reactor is then passed into a second reactor containing a reducible metal oxide which serves to selectively combust hydrogen in an oxidation/reduction (REDOX) reaction. This particular mode of operation is termed a separate reactor, REDOX mode.Type: GrantFiled: May 25, 1995Date of Patent: October 8, 1996Inventors: Pradyot A. Agaskar, Robert K. Grasselli, James N. Michaels, P. Thomas Reischman, David L. Stern, John G. Tsikoyiannis
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Patent number: 5530171Abstract: There is provided a process for the net catalytic oxidative dehydrogenation of alkanes to produce alkenes. The process involves simultaneous equilibrium dehydrogenation of alkanes to alkenes and combustion of the hydrogen formed to drive the equilibrium dehydrogenation reaction further to the product alkenes. In the present reaction, the alkane feed is passed into a reactor containing both an equilibrium dehydrogenation catalyst and a reducible metal oxide, whereby the alkane is dehydrogenated and the hydrogen produced is simultaneously and selectively combusted in oxidation/ reduction (REDOX) reaction with the reducible metal oxide. This particular mode of operation is termed a same reactor, REDOX mode. The equilibrium dehydrogenation catalyst may comprise platinum and the reducible metal oxide may contain bismuth, antimony, indium, or molybdenum, or a mixture thereof.Type: GrantFiled: April 17, 1995Date of Patent: June 25, 1996Assignee: Mobil Oil CorporationInventors: Pradyot A. Agaskar, Robert K. Grasselli, James N. Michaels, P. Thomas Reischman, David L. Stern, John G. Tsikoyiannis
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Patent number: 5527979Abstract: There is provided a process for the net catalytic oxidative dehydrogenation of alkanes to produce alkenes. The process involves simultaneous equilibrium dehydrogenation of alkanes to alkenes and combustion of the hydrogen formed to drive the equilibrium dehydrogenation reaction further to the product alkenes. In the present reaction, the alkane feed is dehydrogenated over an equilbrium dehydrogenation catalyst in a first reactor, and the effluent from the first reactor, along with oxygen, is then passed into a second reactor containing a metal oxide catalyst which serves to selectively catalyze the combustion of hydrogen. This particular mode of operation is termed a separate reactor, cofed oxygen mode. The equilibrium dehydrogenation catalyst may comprise platinum and the selective metal oxide combustion catalyst may contain bismuth, antimony, indium, molybdenum, or a mixture thereof.Type: GrantFiled: April 17, 1995Date of Patent: June 18, 1996Assignee: Mobil Oil CorporationInventors: Pradyot A. Agaskar, Robert K Grasselli, James N. Michaels, P. Thomas Reischman, David L. Stern, John G. Tsikoyiannis
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Patent number: 5430210Abstract: There is provided a process for the selective combustion of hydrogen using a membrane structure containing metal oxides, such as bismuth oxide, that can selectively oxidize hydrogen in the presence of hydrocarbons by virtue of their lattice oxygen. A hydrocarbon/hydrogen containing gas and an oxygen-containing gas, such as air, are passed on separate sides of the membrane. The lattice oxygen is continuously being replenished by air oxidation. The selective hydrogen combustion reactor can be used in dehydrogenation processes as an interstage heater and as a hydrogen scavenger for olefin yield maximization.Type: GrantFiled: July 8, 1994Date of Patent: July 4, 1995Assignee: Mobil Oil CorporationInventors: Robert K. Grasselli, John G. Tsikoyiannis
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Patent number: 5430209Abstract: There is provided a process for the net catalytic oxidative dehydrogenation of alkanes to produce alkenes. The process involves simultaneous equilibrium dehydrogenation of alkanes to alkenes and combustion of the hydrogen formed to drive the equilibrium dehydrogenation reaction further to the product alkenes. In the present reaction, the alkane feed is dehydrogenated over an equilbrium dehydrogenation catalyst in a first reactor, and the effluent from the first reactor is then passed into a second reactor containing a reducible metal oxide which serves to selectively combust hydrogen in an oxidation/reduction (REDOX) reaction. This particular mode of operation is termed a separate reactor, REDOX mode.Type: GrantFiled: August 27, 1993Date of Patent: July 4, 1995Assignee: Mobil Oil Corp.Inventors: Pradyot A. Agaskar, Robert K. Grasselli, James N. Michaels, P. Thomas Reischman, David L. Stern, John G. Tsikoyiannis
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Patent number: 5374410Abstract: A process for converting noxious nitrogen oxides present in gaseous effluent to N.sub.2 comprising reacting the gaseous effluent with an effective amount of reducing agent, e.g., ammonia, in the presence of a catalyst structure comprising a film of interconnected zeolite crystals bonded to a substrate, said catalyst structure being characterized by a value r representing the mg of zeolite/cm.sup.2 of substrate surface and a value e representing the coating efficiency as mg of bonded zeolite/mg of YO.sub.2 initially in the synthesis mixture, wherein r is at least 0.5 and e is at least 0.05.Type: GrantFiled: November 8, 1993Date of Patent: December 20, 1994Inventors: Robert K. Grasselli, Rudolph M. Lago, Richard F. Socha, John G. Tsikoyiannis
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Patent number: 5349117Abstract: A process for separating at least one component from a mixture of components which comprises contacting the mixture with a sorbent structure comprising a film of interconnected zeolite crystals bonded to a substrate, said sorbent structure being characterized by a value r representing the mg of zeolite/cm.sup.2 of substrate surface and a value e representing the coating efficiency as mg of bonded zeolite/mg of YO.sub.2 initially in the synthesis mixture, wherein r is at least 0.5 and e is at least 0.05.Type: GrantFiled: November 8, 1993Date of Patent: September 20, 1994Assignee: Mobil Oil Corp.Inventors: Robert K. Grasselli, Rudolph M. Lago, Richard F. Socha, John G. Tsikoyiannis
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Patent number: 5316661Abstract: A method for synthesizing a zeolite bonded to a substrate utilizes a reaction mixture having a H.sub.2 O/YO.sub.2 molar ratio of at least 25 and Y is a tetravalent element, particularly silicon.A structure made according to this method includes a film of interconnected zeolite crystals bonded to a substrate and the structure is characterized by a value r representing the mg of zeolite/cm.sup.2 of substrate surface and a value e representing the coating efficiency as mg of bonded zeolite/mg of YO.sub.2 initially in the synthesis mixture; wherein r is at least 0.5 and e is at least 0.05.Processes are provided for separation, sorption, organic feedstock conversion, light paraffin dehydrogenation and NO.sub.X conversion over the structure.Type: GrantFiled: April 16, 1993Date of Patent: May 31, 1994Assignee: Mobil Oil CorporationInventors: Ralph M. Dessau, Robert K. Grasselli, Rudolph M. Lago, John G. Tsikoyiannis
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Patent number: 5310714Abstract: A method for synthesizing a zeolite bonded to a substrate utilizes a reaction mixture having a H.sub.2 O/YO.sub.2 molar ratio of at least 25 and Y is a tetravalent element, particularly silicon.A structure made according to this method includes a film of interconnected zeolite crystals bonded to a substrate and the structure is characterized by a value r representing the mg of zeolite/cm.sup.2 of substrate surface and a value e representing the coating efficiency as mg of bonded zeolite/mg of YO.sub.2 initially in the synthesis mixture; wherein r is at least 0.5 and e is at least 0.05.Processes are provided for separation, sorption, organic feedstock conversion and NO.sub.x conversion over the structure.Type: GrantFiled: July 8, 1992Date of Patent: May 10, 1994Assignee: Mobil Oil Corp.Inventors: Robert K. Grasselli, Rudolph M. Lago, Richard F. Socha, John G. Tsikoyiannis
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Patent number: 5110478Abstract: A process is provided for catalytic conversion of organic compounds in a conversion zone containing a synthetic, non-composited microporous membrane comprising a continuous array of crystalline molecular sieve material.Type: GrantFiled: March 25, 1991Date of Patent: May 5, 1992Assignee: Mobil Oil Corp.Inventors: Werner O. Haag, John G. Tsikoyiannis
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Patent number: 5100596Abstract: A method is provided for the preparation of a synthetic, non-composited microporous membrane comprising a continuous array of crystalline molecular sieve material. A non-porous forming surface is contacted, under crystallization conditions, with a chemical mixture capable of forming the molecular sieve material. After a layer of the molecular sieve material is crystallized on the forming surface, the layer and the forming surface are recovered from the chemical mixture and the layer is separated from the forming surface.Type: GrantFiled: March 25, 1991Date of Patent: March 31, 1992Assignee: Mobil Oil Corp.Inventors: Werner O. Haag, John G. Tsikoyiannis, Ernest W. Valyocsik
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Patent number: 5069794Abstract: A process is provided for separation of components of a gaseous or liquid mixture which comprises contacting the mixture with a synthetic, non-composited microporous membrane comprising a continuous array of crystalline molecular sieve material.Type: GrantFiled: March 25, 1991Date of Patent: December 3, 1991Assignee: Mobil Oil Corp.Inventors: Werner O. Haag, John G. Tsikoyiannis
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Patent number: 5019263Abstract: A synthetic, non-composited microporous membrane comprises a continuous array of crystalline molecular sieve material. A method is also provided for the preparation of the membrane, and methods are provided for using the membrane as a catalyst, or as a non-catalytic separation membrane for liquid or gaseous mixtures.Type: GrantFiled: June 5, 1990Date of Patent: May 28, 1991Assignee: Mobil Oil Corp.Inventors: Werner O. Haag, John G. Tsikoyiannis