Patents by Inventor Ajit Singh Mamman

Ajit Singh Mamman 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: 7432222
    Abstract: This invention discloses a high temperature stable, supported, non-noble metal catalyst, represented by a general formula: NiCoaCebMgcYdOx(y)/S, wherein S is a low surface area, macroporous, highly sintered, solid support comprising zirconium and hafnium oxides with less than 3 wt % silica and/or alumina having a surface area less than 1.0 m2/g and pore diameter greater than 0.1 micron, in the form of pellet, ring, monolith or granules; a is from 0.01 to 10; b is from 0.001 to 10; c is from 0.001 to 10; d is from 0.005 to 5; x is number of oxygen atoms required to fulfill the valance requirement of the metallic elements; and y is weight percent loading of the active catalyst mass, on the support, S, in the range from 0.7% to 70%. The invention also discloses a process for the partial oxidation of hydrocarbon(s) to syngas using the thermally stable catalyst.
    Type: Grant
    Filed: November 1, 2004
    Date of Patent: October 7, 2008
    Assignee: Council of Scientific and Industrial Research
    Inventors: Vasant Ramchandra Choudhary, Kartick Chandra Mondal, Ajit Singh Mamman
  • Patent number: 6293979
    Abstract: A process for catalytic conversion of methane or natural gas to syngas using a supported catalyst containing oxides of nickel and cobalt with of without noble metals. Efficiency of the catalytic process is increased by simultaneously carrying out an exothermic oxidation reaction and an endothermic steam and carbon dioxide reforming reaction over the supported catalyst. The catalyst is prepared by depositing oxides of nickel and cobalt, with or without noble metals, on a sintered low surface area porous inert support. Surface of the support is precoated with an oxide of Be, Mg, Ca or a mixture thereof so that a protective layer of alkaline earth oxide is formed between the oxides of nickel and cobalt and the support, and hence, direct chemical interactions between the oxides of nickel and cobalt and reactive components of the support, which leads to formation of catalytically inactive binary oxide phases, are avoided.
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: September 25, 2001
    Assignee: Council of Scientific & Industrial Research
    Inventors: Vasant Ramchandra Choudhary, Balu Shivaji Uphade, Ajit Singh Mamman, Amarjeet Munshiram Rajput
  • Patent number: 5744419
    Abstract: A supported catalyst is prepared by depositing oxides of nickel and cobalt, with or without noble metals, on a sintered low surface area porous inert support, surface of which is precoated with an oxide of Be, Mg, Ca or a mixture thereof so that a protective layer of the alkaline earth oxide is formed between the oxides of nickel and cobalt, with or without noble metal, and the support and hence direct chemical interactions between the oxides of the group VIII transition metals and the reactive components of support, which leads to the formation of catalytically inactive binary oxide phases are avoided.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: April 28, 1998
    Assignee: Council of Scientific And Industrial Research
    Inventors: Vasant Ramchandra Choudhary, Balu Shivaji Uphade, Ajit Singh Mamman, Amarjeet Munshiram Rajput