Patents by Inventor Daxiang Wang
Daxiang Wang 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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Publication number: 20050265920Abstract: The present invention relates to thermally stable supports and catalysts for use in high temperature operation, and methods of preparing such supports and catalysts, which includes adding a rare earth metal to an aluminum-containing precursor prior to calcining. The present invention can be more specifically seen as a support, process and catalyst wherein the thermally stable support comprises two rare earth aluminates of different molar ratios of aluminum to rare earth metal, and optionally, alumina and/or a rare earth oxide. More particularly, the invention relates to the use of noble metal catalysts comprising the thermally stable support for synthesis gas production via partial oxidation of light hydrocarbon (e.g., methane) with minimal deactivation over long-term operations and further relates to gas-to-liquids conversion processes.Type: ApplicationFiled: May 27, 2005Publication date: December 1, 2005Applicant: ConocoPhillips CompanyInventors: Cemal Ercan, Shuibo Xie, Harold Wright, Yaming Jin, Daxiang Wang, Kristi Fjare, David Minahan, Beatrice Ortego, David Simon
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Patent number: 6958309Abstract: A pretreatment method for increasing the average pore size of a catalyst support is disclosed which increases the diffusivity and effectiveness factor ?. The pretreatment method includes calcining the support in moisturized air at an elevated temperature sufficient to increase the average pore size. In some embodiments, the support may be treated with an acidic/basic solution prior to the calcination step. Alternatively, the calcination step may occur in a gas mixture including water/air/acidic (or basic) gases.Type: GrantFiled: August 1, 2002Date of Patent: October 25, 2005Assignee: ConocoPhillips CompanyInventors: Daxiang Wang, Tianyan Niu, Gloria I. Straguzzi, Harold A. Wright, Robin G. Cnossen
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Publication number: 20050209349Abstract: The present invention relates to a process for the preparation of synthesis gas (i.e., a mixture of carbon monoxide and hydrogen), typically labeled syngas. More particularly, the present invention relates to a regeneration method for a syngas catalyst. Still more particularly, the present invention relates to the regeneration of syngas catalysts using a re-dispersion technique. One embodiment of the re-dispersion technique involves the treatment of a deactivated syngas catalyst with a re-dispersing gas, preferably a carbon monoxide-containing gas such as syngas. If necessary, the catalyst is then exposed to hydrogen for reduction and further re-dispersion.Type: ApplicationFiled: April 25, 2005Publication date: September 22, 2005Applicant: Conoco Inc.Inventors: Daxiang Wang, Baili Hu, Yaming Jin, Harold Wright
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Patent number: 6946114Abstract: Lanthanide-promoted rhodium-containing supported catalysts that are active for catalyzing the net partial oxidation of methane to CO and H2 are disclosed, along with their manner of making and high efficiency processes for producing synthesis gas employing the new catalysts. A preferred catalyst comprises highly dispersed, high surface area rhodium on a granular zirconia support with an intermediate coating of a lanthanide metal and/or oxide thereof and is thermally conditioned during catalyst preparation. In a preferred syngas production process a stream of methane-containing gas and O2 is passed over a thermally conditioned, high surface area Rh/Sm/zirconia granular catalyst in a short contact time reactor to produce a mixture of carbon monoxide and hydrogen.Type: GrantFiled: September 5, 2001Date of Patent: September 20, 2005Assignee: ConocoPhillips CompanyInventors: Joe D. Allison, Larry D. Swinney, Tianyan Niu, Kevin L. Ricketson, Daxiang Wang, Sriram Ramani, Gloria I. Straguzzi, David M. Minahan, Harold A. Wright, Baili Hu
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Patent number: 6911193Abstract: Embodiments include a method and apparatus for converting a hydrocarbon and oxygen feed stream to a product stream such as syngas, including multiple serially aligned reaction zones and multiple hydrocarbon feeds. The first reaction zone catalyzes the net partial oxidation of the feed hydrocarbon. The subsequent zones catalyze reactions such as the stream or dry reforming of hydrocarbons or the water gas shift reaction, depending on the stream composition in the vicinity of the zone, and the desired product stream composition.Type: GrantFiled: April 19, 2002Date of Patent: June 28, 2005Assignee: ConocoPhillips CompanyInventors: Joe D. Allison, Sriram Ramani, Daxiang Wang, Tianyan Niu, Yaming Jin, Gloria I. Straguzzi
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Publication number: 20050112047Abstract: Lanthanide-promoted rhodium-containing supported catalysts that are active for catalyzing the net partial oxidation of methane to CO and H2 are disclosed, along with their manner of making and high efficiency processes for producing synthesis gas employing the new catalysts. A preferred catalyst comprises highly dispersed, high surface area rhodium on a granular zirconia support with an intermediate coating of a lanthanide metal and/or oxide thereof and is thermally conditioned during catalyst preparation. In a preferred syngas production process a stream of methane-containing gas and O2 is passed over a thermally conditioned, high surface area Rh/Sm/zirconia granular catalyst in a short contact time reactor to produce a mixture of carbon monoxide and hydrogen.Type: ApplicationFiled: January 3, 2005Publication date: May 26, 2005Applicant: ConocoPhillips CompanyInventors: Joe Allison, Larry Swinney, Tianyan Niu, Kevin Ricketson, Daxiang Wang, Sriram Ramani, Gloria Straguzzi, David Minahan, Harold Wright, Baili Hu
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Patent number: 6896868Abstract: The present invention relates to a process for the preparation of synthesis gas (i.e., a mixture of carbon monoxide and hydrogen), typically labeled syngas. More particularly, the present invention relates to a regeneration method for a syngas catalyst. Still more particularly, the present invention relates to the regeneration of syngas catalysts using a re-dispersion technique. One embodiment of the re-dispersion technique involves the treatment of a deactivated syngas catalyst with a re-dispersing gas, preferably a carbon monoxide-containing gas such as syngas. If necessary, the catalyst is then exposed to hydrogen for reduction and further re-dispersion.Type: GrantFiled: August 15, 2002Date of Patent: May 24, 2005Assignee: ConocoPhillips CompanyInventors: Daxiang Wang, Baili Hu, Yaming Jin, Harold A. Wright
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Publication number: 20040198845Abstract: The present invention is an improvement in the preparation of liquid hydrocarbons from natural gas/methane, oxygen and/or steam. In particular, the present invention relates to processes for the production of synthesis gas, reducing the oxygen concentration from the synthesis gas, and the production of liquid hydrocarbons using the oxygen reduced synthesis gas as a feedstock. More particularly, the present invention described herein identifies catalyst compositions, apparatus and methods of using such catalysts and apparatus for preparing liquid hydrocarbons via oxygen reduced synthesis gas all in accordance with the present invention.Type: ApplicationFiled: April 12, 2004Publication date: October 7, 2004Applicant: ConocoPhilips CompanyInventors: Daxiang Wang, Harold A. Wright, Beatrice C. Ortego, Sinh Trinh, Rafael Espinoza
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Patent number: 6797252Abstract: The present invention is directed towards a process that allows for the adjustment of hydrogen concentration in a syngas product or Fischer-Tropsch feedstock stream. In particular, the invention is identified as an improved process for producing syngas comprising a secondary chemical reaction, preferably a water gas shift reaction, that allows for the adjustment of the hydrogen concentration in a syngas product stream. Ultimately, the present invention is for an improved process for converting hydrocarbon-containing gas to liquid hydrocarbons.Type: GrantFiled: November 25, 2002Date of Patent: September 28, 2004Assignee: ConocoPhillips CompanyInventors: Daxiang Wang, Barbara A. Belt, Vincent H. Melquist, Steve R. Landis
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Patent number: 6790431Abstract: Embodiments include methods and apparatus for arranging multiple reaction zones such that at least one hot spot in one of the reaction zones is moderated by a cooler spot in an adjacent reaction zone.Type: GrantFiled: July 16, 2002Date of Patent: September 14, 2004Assignee: ConocoPhillips CompanyInventors: Daxiang Wang, Bang Cheng Xu, Yi Jiang
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Publication number: 20040171900Abstract: The present invention includes methods and apparatus for start-up a chemical reactor wherein at least a portion of the igniter is downstream from the reaction zone which needs to be ignited. Particularly, embodiments of the present invention include a partial oxidation reactor with an igniter downstream of the partial oxidation zone.Type: ApplicationFiled: February 28, 2003Publication date: September 2, 2004Applicant: ConocoPhillips CompanyInventors: Daxiang Wang, Chad Ricketson, Gloria I. Straguzzi, Harold A. Wright, Larry D. Swinney, Joe D. Allison, Zhen Chen, Kevin L. Ricketson, Shang Y. Chen, Steven R. McDonald
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Patent number: 6747066Abstract: The present invention is an improvement in the preparation of liquid hydrocarbons from natural gas/methane, oxygen and/or steam. In particular, the present invention relates to processes for the production of synthesis gas, reducing the oxygen concentration from the synthesis gas, and the production of liquid hydrocarbons using the oxygen reduced synthesis gas as a feedstock. More particularly, the present invention described herein identifies catalyst compositions, apparatus and methods of using such catalysts and apparatus for preparing liquid hydrocarbons via oxygen reduced synthesis gas all in accordance with the present invention.Type: GrantFiled: August 15, 2002Date of Patent: June 8, 2004Assignee: ConocoPhillips CompanyInventors: Daxiang Wang, Harold A. Wright, Beatrice C. Ortego, Sinh Trinh, Rafael Espinoza
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Publication number: 20040101473Abstract: The present invention is directed towards a process that allows for the adjustment of hydrogen concentration in a syngas product or Fischer-Tropsch feedstock stream. In particular, the invention is identified as an improved process for producing syngas comprising a secondary chemical reaction, preferably a water gas shift reaction, that allows for the adjustment of the hydrogen concentration in a syngas product stream. Ultimately, the present invention is for an improved process for converting hydrocarbon-containing gas to liquid hydrocarbons.Type: ApplicationFiled: November 25, 2002Publication date: May 27, 2004Applicant: Conoco Inc.Inventors: Daxiang Wang, Barbara A. Belt, Vincent H. Melquist, Steve R. Landis
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Publication number: 20040092392Abstract: A porous catalyst support having an increased average pore size is produced from a mixed metal oxide material. In accordance with one embodiment, a method for preparing a mixed metal oxide material includes providing a mixed metal oxide precursor containing at least two metals, calcining the mixed metal oxide precursor at a temperature sufficient to form a thermally and mechanically stable mixed metal oxide material, and leaching the mixed metal oxide material in a leach solution with a constituent that dissolves one metal oxide. Preferably, the calcination temperature is approximately between 300° C. and 1300° C. The leaching constituent may be chosen from the group including acidic solutions of HCl, HNO3, H2SO4, H3PO3, and their combinations, or basic solutions of NH3, NaOH, KOH, and their combinations.Type: ApplicationFiled: November 13, 2002Publication date: May 13, 2004Applicant: Conoco Inc.Inventors: Daxiang Wang, Shuibo Xie
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Publication number: 20040052725Abstract: The present invention generally relates to catalysts comprising at least one oxidized active metal; at least one lanthanide; and a refractory support. The active metal is selected from the group consisting of rhodium, ruthenium, rhenium, platinum, palladium, iridium, and osmium. In particular, the present invention relates to catalysts effective for initiating and sustaining the partial oxidation of light hydrocarbons, preferably methane, to a product mixture comprising carbon monoxide and hydrogen, e.g. synthesis gas. The present invention still further discloses a method of making a supported synthesis gas catalyst comprising an oxidized metal and at least one lanthanide.Type: ApplicationFiled: June 30, 2003Publication date: March 18, 2004Applicant: ConocoPhillips CompanyInventors: Tianyan Niu, Daxiang Wang, David Minahan, Baili Hu, Harold A. Wright
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Publication number: 20040033885Abstract: The present invention relates to a process for the preparation of synthesis gas (i.e., a mixture of carbon monoxide and hydrogen), typically labeled syngas. More particularly, the present invention relates to a regeneration method for a syngas catalyst. Still more particularly, the present invention relates to the regeneration of syngas catalysts using a re-dispersion technique. One embodiment of the re-dispersion technique involves the treatment of a deactivated syngas catalyst with a re-dispersing gas, preferably a carbon monoxide-containing gas such as syngas. If necessary, the catalyst is then exposed to hydrogen for reduction and further re-dispersion.Type: ApplicationFiled: August 15, 2002Publication date: February 19, 2004Applicant: Conoco Inc.Inventors: Daxiang Wang, Baili Hu, Yaming Jin, Harold A. Wright
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Publication number: 20040023797Abstract: A pretreatment method for increasing the average pore size of a catalyst support is disclosed which increases the diffusivity and effectiveness factor &eegr;. The pretreatment method includes calcining the support in moisturized air at an elevated temperature sufficient to increase the average pore size. In some embodiments, the support may be treated with an acidic/basic solution prior to the calcination step. Alternatively, the calcination step may occur in a gas mixture including water/air/acidic (or basic) gases.Type: ApplicationFiled: August 1, 2002Publication date: February 5, 2004Applicant: Conoco Inc.Inventors: Daxiang Wang, Tianyan Niu, Gloria I. Starguzzi, Harold A. Wright
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Publication number: 20040014826Abstract: Embodiments include methods and apparatus for arranging multiple reaction zones such that at least one hot spot in one of the reaction zones is moderated by a cooler spot in an adjacent reaction zone.Type: ApplicationFiled: July 16, 2002Publication date: January 22, 2004Applicant: Conoco Inc.Inventors: Daxiang Wang, Bang Cheng Xu, Yi Jiang
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Publication number: 20040010174Abstract: A catalyst system and process for use in ODH that allows high conversion of hydrocarbon feedstock at high gas velocities, while maintaining high selectivity of the process to the desired products. In accordance with a preferred embodiment, a catalyst for use in ODH processes includes a dehydrogenative catalytically active component and an oxidative catalytically active component. The catalyst preferably has the general formula &agr;AOx-&bgr;BOy-&ggr;COz, wherein A is a precious metal and/or transition metal, B is a rare earth metal, C is an element chosen from Groups IIA, IIIA, and IVA, and O is oxygen. In accordance with another preferred embodiment, a method for converting gaseous hydrocarbons to olefins includes reacting an alkane feed stream with an oxidized bifunctional catalyst in a riser reactor to produce product vapors containing olefins and paraffins and a reduced catalyst.Type: ApplicationFiled: July 15, 2002Publication date: January 15, 2004Applicant: Conoco Inc.Inventors: Daxiang Wang, Joe D. Allison
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Publication number: 20040002422Abstract: A process and system for producing industrial-scale quantities of highly dispersed, thermally stable catalysts is disclosed. The process, which may be continuous production or batch production, includes mixing together the desired catalyst precursor materials, a combustible organic material and a solvent; evaporating the solvent, combusting the catalyst intermediate; and shaping final catalyst.Type: ApplicationFiled: June 27, 2002Publication date: January 1, 2004Applicant: Conoco Inc.Inventors: Daxiang Wang, Yaming Jin, Harold A. Wright, Carl Johnston