Patents by Inventor Michael Tsapatsis

Michael Tsapatsis 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).

  • Patent number: 11498062
    Abstract: Methods and phosphorus-containing solid catalysts for catalyzing dehydration of cyclic ethers (e.g., furans, such as 2,5-dimethylfuran) and alcohols (e.g., ethanol and isopropanol). The alcohols and cyclic ethers may be derived from biomass. One example includes a tandem Diels-Alder cycloaddition and dehydration of biomass-derived 2,5-dimethyl-furan and ethylene to renewable p-xylene. The phosphorus-containing solid catalysts are also active and selective for dehydration of alcohols to alkenes.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: November 15, 2022
    Assignees: Regents of the University of Minnesota, University of Massachusetts Amherst, University of Delaware
    Inventors: Hong Je Cho, Wei Fan, Michael Tsapatsis, Paul J. Dauenhauer, Limin Ren, Raul Lobo
  • Patent number: 11344850
    Abstract: A nanocomposite including a mesoporous, macroporous, or a combination thereof oxide and a zeolitic imidazolate framework (ZIF) that is filling the pores of the oxide to form a ZIF phase embedded and at least substantially confined mostly within the oxide. Methods of making nanocomposites including the steps of depositing an oxide in the pores of a mesoporous oxide; and further treating the resulting material with vapor, liquid, or supercritical CO2 comprising an azole-based compound, a carboxylate based compound, or a combination thereof. Use of disclosed articles to separate propylene and propane in a mixture thereof.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: May 31, 2022
    Inventors: Michael Tsapatsis, Xiaoli Ma
  • Patent number: 11311855
    Abstract: An example method of removing hydrogen sulfide from an input gas includes exposing an adsorbent material to an input gas to obtain an output gas. A concentration of hydrogen sulfide of the output gas is less than a concentration of hydrogen sulfide of the input gas. The adsorbent material includes copper oxide, magnesium oxide, and aluminum oxide. An atomic ratio of copper to magnesium to aluminum of the adsorbent material is X:Y:Z, where X is greater than or equal to 0.6 and less than or equal to 0.9, where Y is greater than or equal to 0 and less than or equal to 0.2, where Z is greater than or equal to 0 and less than or equal to 0.2, and where X+Y+Z is equal to 1.
    Type: Grant
    Filed: October 13, 2015
    Date of Patent: April 26, 2022
    Assignees: Regents of the University of Minnesota, Khalifa University of Science and Technology
    Inventors: Michael Tsapatsis, Veerappan Vaithilingam Balasubramanian, Yasser Al Wahedi, Saleh Al Hashimi
  • Patent number: 11066309
    Abstract: An example material includes a planar layer of MFI zeolite. The planar layer has a thickness in a range between 4 nm and 10 nm for at least 70% of a basal area of the planar layer. In one embodiment, the planar layer includes an embedded particle of an MFI zeolite.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: July 20, 2021
    Assignee: Regents of the University of Minnesota
    Inventors: Michael Tsapatsis, Mi Young Jeon, Pyung-Soo Lee, Donghun Kim, Prashant Kumar, K. Andre Mkhoyan, Joern Ilja Siepmann
  • Patent number: 10919030
    Abstract: Forming a diene includes contacting a reactant including at least one of a cyclic ether and a diol with a heterogeneous acid catalyst to yield a reaction mixture including a diene. The heterogeneous acid catalyst includes at least one of a Lewis acid catalyst, a supported Lewis-acid catalyst, a Brnsted acid catalyst, a solid acid catalyst, a supported phosphoric acid catalyst, and a sulfonated catalyst. The dehydration of cyclic ethers and diols with high selectivity to yield dienes completes pathways for the production of dienes, such as isoprene and butadiene, from biomass in high yields, thereby promoting economical production of dienes from renewable resources.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: February 16, 2021
    Assignee: Regents of the University of Minnesota
    Inventors: Omar A. Abdelrahman, Charles S. Spanjers, Dae Sung Park, Michael Tsapatsis, Limin Ren, Paul J. Dauenhauer
  • Patent number: 10894732
    Abstract: The present disclosure relates to wastewater treatment systems for attracting and retaining anaerobic ammonia oxidizing (anammox) bacteria, methods of treating wastewater using such wastewater treatment systems, and the like.
    Type: Grant
    Filed: June 6, 2019
    Date of Patent: January 19, 2021
    Assignee: REGENTS OF THE UNIVERSITY OF MINNESOTA
    Inventors: Paige Novak, Santiago Romero-Vargas Castrillon, Anndee Huff, Marc A. Hillmyer, Michael Tsapatsis
  • Publication number: 20190375662
    Abstract: The present disclosure relates to wastewater treatment systems for attracting and retaining anaerobic ammonia oxidizing (anammox) bacteria, methods of treating wastewater using such wastewater treatment systems, and the like.
    Type: Application
    Filed: June 6, 2019
    Publication date: December 12, 2019
    Inventors: Paige Novak, Santiago Romero-Vargas Castrillon, Anndee Huff, Marc A. Hillmyer, Michael Tsapatsis
  • Publication number: 20190344252
    Abstract: Methods and phosphorus-containing solid catalysts for catalyzing dehydration of cyclic ethers (e.g., furans, such as 2,5-dimethylfuran) and alcohols (e.g., ethanol and isopropanol). The alcohols and cyclic ethers may be derived from biomass. One example includes a tandem Diels-Alder cycloaddition and dehydration of biomass-derived 2,5-dimethyl-furan and ethylene to renewable p-xylene. The phosphorus-containing solid catalysts are also active and selective for dehydration of alcohols to alkenes.
    Type: Application
    Filed: September 29, 2017
    Publication date: November 14, 2019
    Inventors: Hong Je Cho, Wei Fan, Michael Tsapatsis, Paul J. Dauenhauer, Limin Ren, Raul Lobo
  • Publication number: 20190345078
    Abstract: Forming a diene includes contacting a reactant including at least one of a cyclic ether and a diol with a heterogeneous acid catalyst to yield a reaction mixture including a diene. The heterogeneous acid catalyst includes at least one of a Lewis acid catalyst, a supported Lewis-acid catalyst, a Brnsted acid catalyst, a solid acid catalyst, a supported phosphoric acid catalyst, and a sulfonated catalyst. The dehydration of cyclic ethers and diols with high selectivity to yield dienes completes pathways for the production of dienes, such as isoprene and butadiene, from biomass in high yields, thereby promoting economical production of dienes from renewable resources.
    Type: Application
    Filed: September 29, 2017
    Publication date: November 14, 2019
    Inventors: Omar A. Abdelrahman, Charles S. Spanjers, Dae Sung Park, Michael Tsapatsis, Limin Ren, Paul J. Dauenhauer
  • Publication number: 20190168173
    Abstract: A nanocomposite including a mesoporous, macroporous, or a combination thereof oxide and a zeolitic imidazolate framework (ZIF) that is filling the pores of the oxide to form a ZIF phase embedded and at least substantially confined mostly within the oxide. Methods of making nanocomposites including the steps of depositing an oxide in the pores of a mesoporous oxide; and further treating the resulting material with vapor, liquid, or supercritical CO2 comprising an azole-based compound, a carboxylate based compound, or a combination thereof. Use of disclosed articles to separate propylene and propane in a mixture thereof.
    Type: Application
    Filed: October 26, 2018
    Publication date: June 6, 2019
    Inventors: Michael Tsapatsis, Xiaoli Ma
  • Patent number: 10213748
    Abstract: Methods for forming two-dimensional (2D) zeolite nanosheets include exposing a multi-lamellar (ML) zeolite material including an organic structure directing agent (OSDA) to a mixture including sulfuric acid and hydrogen peroxide under conditions sufficient to remove substantially all of the OSDA from the ML zeolite material; and after exposing the ML zeolite material, treating a solution containing the ML zeolite material to sonication and/or mixing under conditions sufficient to substantially exfoliate layers of the ML zeolite to obtain porous two-dimensional zeolite nanosheets that are substantially free of the OSDA. In some cases, without further treatment such as secondary growth of the zeolite coating layer, a deposit of the OSDA-free nanosheets on polymer support exhibits hydrocarbon isomer selectivity.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: February 26, 2019
    Assignee: Regents of the University of Minnesota
    Inventors: Michael Tsapatsis, Qiang Xiao, Han Zhang
  • Publication number: 20180311642
    Abstract: An example method of removing hydrogen sulfide from an input gas includes exposing an adsorbent material to an input gas to obtain an output gas. A concentration of hydrogen sulfide of the output gas is less than a concentration of hydrogen sulfide of the input gas. The adsorbent material includes copper oxide, magnesium oxide, and aluminum oxide. An atomic ratio of copper to magnesium to aluminum of the adsorbent material is X:Y:Z, where X is greater than or equal to 0.6 and less than or equal to 0.9, where Y is greater than or equal to 0 and less than or equal to 0.2, where Z is greater than or equal to 0 and less than or equal to 0.2, and where X+Y+Z is equal to 1.
    Type: Application
    Filed: October 13, 2015
    Publication date: November 1, 2018
    Inventors: Michael Tsapatsis, Veerappan Vaithilingam Balasubramanian, Yasser Al Wahedi, Saleh Al Hashimi
  • Patent number: 10112171
    Abstract: The disclosure relates to copper oxide-based sorbents, and processes for preparing and using them. The sorbents are preferably used to remove one or more sulfur species from gas streams. The sorbents comprise a porous silica support material impregnated with CuO nanoparticles. The nanoparticles are uniformly distributed throughout the porous silica support and sulfur compounds are adsorbed on the nanoparticles.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: October 30, 2018
    Assignee: Regents of the University of Minnesota
    Inventors: Michael Tsapatsis, Bahman Elyassi, Yasser Al Wahedi, Saleh Al Hashimi
  • Patent number: 10039999
    Abstract: A process for separating ethanol from a mixture including ethanol and water comprises contacting the mixture with a sorbent or membrane including one or more zeolites having a high adsorption selectivity toward ethanol over water, wherein at least a fraction of the ethanol from the mixture is adsorbed by the sorbent or membrane and an unadsorbed portion of the mixture forms a raffinate having a lower concentration of ethanol than the mixture. The process further includes releasing adsorbed ethanol from the sorbent or membrane as a retentate or a permeant to produce an ethanol extract having a higher concentration of ethanol than the mixture.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: August 7, 2018
    Inventors: Joern Ilja Siepmann, Peng Bai, Michael Tsapatsis
  • Patent number: 10005077
    Abstract: Oxide materials, thin films, coatings, and methods of preparing the same are disclosed herein. In certain embodiments the oxide material can have an MWW type framework or an MFI type framework. In one embodiment, the method includes: providing a suspension of an exfoliated layered oxide material in a solvent; and filtering the suspension through a porous support to provide a film of the oxide material, optionally directly on the porous support. Secondary grown films of the oxide material and methods of preparing the same are also provided. Thin zeolite films are attractive for a wide range of applications including molecular sieve membranes and catalytic membrane reactors, permeation barriers, low dielectric constant materials for microelectronics and sensor components for selective sensing.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: June 26, 2018
    Assignee: REGENTS OF THE UNIVERSITY OF MINNESOTA
    Inventors: Michael Tsapatsis, Kumar Varoon Agrawal
  • Patent number: 10005674
    Abstract: A process for making a mechanically strong, high permeance, and relatively inexpensive support structure for zeolite membranes is described. In an example implementation, a process includes forming a silica powder from silica fibers, mixing the silica powder and a polymer solution to form a mixture, forming the mixture into a shaped mixture, and sintering the shaped mixture to form a silica support.
    Type: Grant
    Filed: July 10, 2014
    Date of Patent: June 26, 2018
    Assignee: Regents of the University of Minnesota
    Inventors: Michael Tsapatsis, Kumar Varoon Agrawal, Lorraine Francis
  • Publication number: 20180111837
    Abstract: An example material includes a planar layer of MFI zeolite. The planar layer has a thickness in a range between 4 nm and 10 nm for at least 70% of a basal area of the planar layer.
    Type: Application
    Filed: October 24, 2017
    Publication date: April 26, 2018
    Inventors: Michael Tsapatsis, Mi Young Jeon, Pyung Cheon Lee, Donghun Kim, Prashant Kumar, K. Andre Mkhoyan, Ilja Siepmann
  • Publication number: 20170210684
    Abstract: A process is provided for the conversion of a hydrocarbon feedstock using catalyst system comprising one or more zeolites. The zeolites have been identified to be capable of selectively catalyzing the hydroisomerization reactions of linear or slightly branched long-chain hydrocarbons. Also provided is a method for the systematic discovery of zeolite framework types that are suitable for such conversion processes, according to a set of criteria: large affinity towards linear alkanes, high adsorption selectivity of linear over branched alkanes, and low adsorption selectivity of linear alkanes of different molecular weights.
    Type: Application
    Filed: July 22, 2015
    Publication date: July 27, 2017
    Inventors: Joern Ilja Siepmann, Peng Bai, Michael Tsapatsis, Michael W. Deem
  • Publication number: 20170203233
    Abstract: A process for separating ethanol from a mixture including ethanol and water comprises contacting the mixture with a sorbent or membrane including one or more zeolites having a high adsorption selectivity toward ethanol over water, wherein at least a fraction of the ethanol from the mixture is adsorbed by the sorbent or membrane and an unadsorbed portion of the mixture forms a raffinate having a lower concentration of ethanol than the mixture. The process further includes releasing adsorbed ethanol from the sorbent or membrane as a retentate or a permeant to produce an ethanol extract having a higher concentration of ethanol than the mixture.
    Type: Application
    Filed: July 22, 2015
    Publication date: July 20, 2017
    Inventors: Joern Ilja Siepmann, Peng Bai, Michael Tsapatsis
  • Publication number: 20170173539
    Abstract: Methods for forming two-dimensional (2D) zeolite nanosheets include exposing a multi-lamellar (ML) zeolite material including an organic structure directing agent (OSDA) to a mixture including sulfuric acid and hydrogen peroxide under conditions sufficient to remove substantially all of the OSDA from the ML zeolite material; and after exposing the ML zeolite material, treating a solution containing the ML zeolite material to sonication and/or mixing under conditions sufficient to substantially exfoliate layers of the ML zeolite to obtain porous two-dimensional zeolite nanosheets that are substantially free of the OSDA. In some cases, without further treatment such as secondary growth of the zeolite coating layer, a deposit of the OSDA-free nanosheets on polymer support exhibits hydrocarbon isomer selectivity.
    Type: Application
    Filed: December 21, 2016
    Publication date: June 22, 2017
    Inventors: Michael Tsapatsis, Qiang Xiao, Han Zhang