Patents by Inventor Subramanian Prasad
Subramanian Prasad 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: 11724248Abstract: The present disclosure relates to copper-containing molecular sieve catalysts that are highly suitable for the treatment of exhaust containing NOx pollutants. The copper-containing molecular sieve catalysts contain ion-exchanged copper as Cu+2 and Cu(OH)+1, and DRIFT spectroscopy of the catalyst exhibits perturbed T-O-T vibrational peaks corresponding to the Cu+2 and Cu(OH)+1. In spectra taken of the catalytic materials, a ratio of the Cu+2 to the Cu(OH)+1 peak integration areas preferably can be ?1. The copper-containing molecular sieve catalysts are aging stable such that the peak integration area percentage of the Cu+2 peak (area Cu+2/(area Cu+2+area Cu(OH)+1)) increases by ?20% upon aging at 800° C. for 16 hours in the presence of 10% H2O/air, compared to the fresh state.Type: GrantFiled: March 19, 2021Date of Patent: August 15, 2023Assignee: BASF CorporationInventors: Wen-Mei Xue, Xiaofan Yang, Haiyang Zhu, Stanley Roth, Jeff Yang, Subramanian Prasad, Ahmad Moini
-
Patent number: 11633726Abstract: The present disclosure generally provides a catalyst composition comprising a zeolite containing iron and/or copper with a reduced amount of extra-framework aluminum. The catalyst composition is useful to catalyze the reduction of nitrogen oxides in exhaust gas in the presence of a reductant.Type: GrantFiled: March 6, 2020Date of Patent: April 25, 2023Assignee: BASF CorporationInventors: Ivan Petrovic, Subramanian Prasad, Joseph Palamara
-
Patent number: 11465134Abstract: The present disclosure generally provides a catalyst composition comprising a zeolite containing iron and/or copper with a reduced amount of extra-framework aluminum. The catalyst composition is useful to catalyze the reduction of nitrogen oxides in exhaust gas in the presence of a reductant.Type: GrantFiled: March 6, 2020Date of Patent: October 11, 2022Assignee: BASF CorporationInventors: Ivan Petrovic, Subramanian Prasad, Joseph Palamara
-
Publication number: 20220266228Abstract: The disclosure generally provides zeolites having the CHA crystalline framework and methods of preparing the same. Provided herein are CHA zeolites containing intergrowths, a controlled framework aluminum distribution, or both. Further provided are CHA zeolites wherein crystals of the zeolite material have a predominantly flake-like morphology as determined by scanning electron microscopy (SEM). Further provided are catalyst compositions, articles, and systems including CHA zeolites promoted with a metal.Type: ApplicationFiled: July 31, 2020Publication date: August 25, 2022Inventors: Rajamani P. GOUNDER, John Rocco DI IORIO, Casey Benjamin JONES, Claire Townsend NIMLOS, Vivek VATTIPALLI, Subramanian PRASAD, Eduard L. KUNKES, Ahmad MOINI
-
Patent number: 11344868Abstract: Certain selective catalytic reduction (SCR) articles, systems and methods provide for high NOx conversion while at the same time low N2O formation. The articles, systems and methods are suitable for instance for the treatment of exhaust gas of diesel engines. Certain articles have zoned coatings disposed thereon, for example, a zoned coating comprising an upstream zone comprising a coating layer comprising a steam-activated iron-containing molecular sieve and a downstream zone comprising a coating layer comprising a high copper-containing molecular sieve.Type: GrantFiled: August 4, 2017Date of Patent: May 31, 2022Assignee: BASF CorporationInventors: Jeff H. Yang, Wen-Mei Xue, Stanley A. Roth, Kenneth E. Voss, Qi Fu, Subramanian Prasad, Barbara K. Slawski, Jaya L. Mohanan, Sandip D. Shah
-
Publication number: 20210229079Abstract: The present disclosure relates to copper-containing molecular sieve catalysts that are highly suitable for the treatment of exhaust containing NOx pollutants. The copper-containing molecular sieve catalysts contain ion-exchanged copper as Cu+2 and Cu(OH)+1, and DRIFT spectroscopy of the catalyst exhibits perturbed T-O-T vibrational peaks corresponding to the Cu+2 and Cu(OH)+1. In spectra taken of the catalytic materials, a ratio of the Cu+2 to the Cu(OH)+1 peak integration areas preferably can be ?1. The copper-containing molecular sieve catalysts are aging stable such that the peak integration area percentage of the Cu+2 peak (area Cu+2/(area Cu+2+area Cu(OH)+1)) increases by ?20% upon aging at 800° C. for 16 hours in the presence of 10% H2O/air, compared to the fresh state.Type: ApplicationFiled: March 19, 2021Publication date: July 29, 2021Applicant: BASF CorporationInventors: Wen-Mei XUE, Xiaofan YANG, Haiyang ZHU, Stanley ROTH, Jeff YANG, Subramanian PRASAD, Ahmad MOINI
-
Publication number: 20200206723Abstract: The present disclosure generally provides a catalyst composition comprising a zeolite containing iron and/or copper with a reduced amount of extra-framework aluminum. The catalyst composition is useful to catalyze the reduction of nitrogen oxides in exhaust gas in the presence of a reductant.Type: ApplicationFiled: March 6, 2020Publication date: July 2, 2020Inventors: Ivan Petrovic, Subramanian Prasad, Joseph Palamara
-
Publication number: 20200108373Abstract: The present disclosure relates to copper-containing molecular sieve catalysts that are highly suitable for the treatment of exhaust containing NOx pollutants. The copper-containing molecular sieve catalysts contain ion-exchanged copper as Cu+2 and Cu(OH)+1, and DRIFT spectroscopy of the catalyst exhibits perturbed T-O-T vibrational peaks corresponding to the Cu+2 and Cu(OH)+1. In spectra taken of the catalytic materials, a ratio of the Cu+2 to the Cu(OH)+1 peak integration areas preferably can be ?1. The copper-containing molecular sieve catalysts are aging stable such that the peak integration area percentage of the Cu+2 peak (area Cu+2/(area Cu+2+area Cu(OH)+1)) increases by ?20% upon aging at 800° C. for 16 hours in the presence of 10% H2O/air, compared to the fresh state.Type: ApplicationFiled: March 20, 2018Publication date: April 9, 2020Inventors: Wen-Mei XUE, Xiaofan YANG, Haiyang ZHU, Stanley ROTH, Jeff YANG, Subramanian PRASAD, Ahmad MOINI
-
Publication number: 20190168199Abstract: Certain selective catalytic reduction (SCR) articles, systems and methods provide for high NOx conversion while at the same time low N2O formation. The articles, systems and methods are suitable for instance for the treatment of exhaust gas of diesel engines. Certain articles have zoned coatings disposed thereon, for example, a zoned coating comprising an upstream zone comprising a coating layer comprising a steam-activated iron-containing molecular sieve and a downstream zone comprising a coating layer comprising a high copper-containing molecular sieve.Type: ApplicationFiled: August 4, 2017Publication date: June 6, 2019Inventors: Jeff H. Yang, Wen-Mei Xue, Stanley A. Roth, Kenneth E. Voss, Qi Fu, Subramanian Prasad, Barbara K. Slawski, Jaya L. Mohanan, Sandip D. Shah
-
Patent number: 9931620Abstract: Described are catalyst materials and catalytic articles comprising a metal exchanged SAPO material comprising a plurality of substitutional sites consisting essentially of Si(4Al) sites and substantially free of Si(0Al) sites. The materials and catalytic articles are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.Type: GrantFiled: September 29, 2017Date of Patent: April 3, 2018Assignee: BASF CorporationInventors: Subramanian Prasad, Martin C. Wende, Jaya L. Mohanan
-
Publication number: 20180021764Abstract: Described are catalyst materials and catalytic articles comprising a metal exchanged SAPO material comprising a plurality of substitutional sites consisting essentially of Si(4Al) sites and substantially free of Si(0Al) sites. The materials and catalytic articles are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.Type: ApplicationFiled: September 29, 2017Publication date: January 25, 2018Inventors: Subramanian Prasad, Martin C. Wende, Jaya L. Mohanan
-
Patent number: 9802182Abstract: Described are catalyst materials and catalytic articles comprising a metal exchanged SAPO material comprising a plurality of substitutional sites consisting essentially of Si(4Al) sites and substantially free of Si(0Al) sites. The materials and catalytic articles are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.Type: GrantFiled: March 12, 2014Date of Patent: October 31, 2017Assignee: BASF CorporationInventors: Subramanian Prasad, Martin C. Wende, Jaya L. Mohanan
-
Publication number: 20150343375Abstract: Molecular sieves, improved methods for their synthesis, and catalysts, systems and methods of using these molecular sieves as catalysts in a variety of processes such as abating pollutants in exhaust gases and conversion processes are described. The molecular sieves are made using a tailored colloid including an alumina source, a silica source and a structure directing agent.Type: ApplicationFiled: August 7, 2015Publication date: December 3, 2015Inventors: Ahmad Moini, Saeed Alerasool, Subramanian Prasad
-
Patent number: 9174849Abstract: Molecular sieves, improved methods for their synthesis, and catalysts, systems and methods of using these molecular sieves as catalysts in a variety of processes such as abating pollutants in exhaust gases and conversion processes are described. The molecular sieves are made using a tailored colloid including an alumina source, a silica source and a structure directing agent.Type: GrantFiled: August 23, 2012Date of Patent: November 3, 2015Inventors: Ahmad Moini, Saeed Alerasool, Subramanian Prasad
-
Publication number: 20140271452Abstract: Described are catalyst materials and catalytic articles comprising a metal exchanged SAPO material comprising a plurality of substitutional sites consisting essentially of Si(4Al) sites and substantially free of Si(0Al) sites. The materials and catalytic articles are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.Type: ApplicationFiled: March 12, 2014Publication date: September 18, 2014Applicant: BASF CorporationInventors: Subramanian Prasad, Martin C. Wende, Jaya L. Mohanan
-
Publication number: 20130052125Abstract: Molecular sieves, improved methods for their synthesis, and catalysts, systems and methods of using these molecular sieves as catalysts in a variety of processes such as abating pollutants in exhaust gases and conversion processes are described. The molecular sieves are made using a tailored colloid including an alumina source, a silica source and a structure directing agent.Type: ApplicationFiled: August 23, 2012Publication date: February 28, 2013Applicant: BASF CorporationInventors: Ahmad Moini, Saeed Alerasool, Subramanian Prasad