1
In Sik Nam, Sung Dae Yim, Joon Hyun Baik, Se Hyuck Oh, Byong Kwon Cho: reduction, Zeolite catalyst and preparation process for NO. General Motors Corporation, Pohang University of Science and Technology, Kathryn A Marra, May 23, 2006: US07049261 (26 worldwide citation)

A zeolite catalyst and a process for preparing a zeolite catalyst which is both capable of catalyzing the removal of nitrogen oxides from a gaseous medium across a broad temperature range and is operationally and hydrothermally stable at high reaction temperatures. The zeolite catalyst includes a ze ...


2
Byong Kwon Cho, Jong Hwan Lee: Method of reducing NOx in diesel engine exhaust. General Motors Corporation, Kathryn A Marra, August 15, 2006: US07090811 (16 worldwide citation)

This invention provides a method of reducing nitrogen oxides in an oxygen containing exhaust stream using ethanol as a reductant for plasma-assisted selective catalytic reduction. The exhaust gas, generated from a diesel engine or other lean-burn power source, comprises nitrogen oxides, especially N ...


3
Byong Kwon Cho: No reduction with diesel fuel reformed by nonthermal hyperplasma. General Motors Corporation, Kathryn A Marra, October 25, 2005: US06957528 (15 worldwide citation)

The reduction of NOx in diesel engine exhaust gas, typically at about 200° C. to 400° C., is accomplished using a dual bed NaY—CuY zeolite reduction catalyst. The effectiveness of the catalyst in reducing the nitrogen oxides is markedly increased by the separate and sequential additions of plasma re ...


4
Byong Kwon Cho, Steven Jeffrey Schmieg, Se Hyuck Oh: Ultra low power plasma reactor system for automotive NOx emission control. General Motors Corporation, Kathryn A Marra, November 1, 2005: US06959538 (9 worldwide citation)

A sidestream located hyper-plasma reactor having an axially discrete pattern of alternating regions of active and passive electric field along the axial direction. The hyper-plasma reactor has great efficacy in terms of ultra low power consumption and copious production of NOx converting aldehydes i ...


5
Byong Kwon Cho, Richard J Blint, Ayyappan Subbiah: Hydrothermally stable catalyst for improved lean NOx reduction. General Motors Corporation, Kathryn A Marra, November 11, 2003: US06645448 (7 worldwide citation)

Certain metal-exchanged SUZ-4 zeolites have been prepared that have catalytic activity for the reduction of NOx in the exhaust of a hydrocarbon or alcohol fueled engine operated under fuel lean conditions. Initially the SUZ-4 zeolite contains alkali metal cations such as Li


6
Jong H Lee, Byong Kwon Cho: emission control system for hydrocarbon fueled power source, NO. GM Global Technology Operations, Reising Ethington P C, September 7, 2010: US07790127 (6 worldwide citation)

A method of reducing NOx in a lean burn engine exhaust stream from a hydrocarbon burning engine may be first passing the exhaust stream over a thrifted diesel oxidation catalyst that substantially completes the oxidation of carbon monoxide to carbon dioxide and the oxidation of hydrocarbons (HC) to ...


7
Byong Kwon Cho, Richard J Blint, Ayyappan Subbiah: Hydrothermally stable catalyst for improved lean NOx reduction. General Motors Corporation, Kathryn A Marra, August 30, 2005: US06936562 (3 worldwide citation)

Certain metal-exchanged SUZ-4 zeolites have been prepared that have catalytic activity for the reduction of NOx in the exhaust of a hydrocarbon or alcohol fueled engine operated under fuel lean conditions. Initially the SUZ-4 zeolite contains alkali metal cations such as Li+, Na+, K+ and/or Cs+. The ...


8
Jin Woo Choung, In Sik Nam, Mun Kyu Kim, Pyung Soon Kim, Byong Kwon Cho: Supported catalyst for removing nitrogen oxides, method of preparing the same, and removing method of nitrogen oxides using the same. Hyundai Motor Company, Postech Academy Industry Foundation, McDermott Will & Emery, December 16, 2014: US08911698

A supported catalyst for reduction reaction of nitrogen oxides includes a support and an silver (Ag)-based compound and aluminum fluoride which are immobilized in the support. A method for preparing the supported catalyst for reduction reaction of nitrogen oxides includes an impregnation step wherei ...


9
Jin Woo Choung, In Sik Nam, Mun Kyu Kim, Young Jin Kim, Pyung Soon Kim, Byong Kwon Cho: Method of reducing nitrogen oxide using amine compound as reductant. Hyundai Motor Company, Postech Academy Industry Foundation, Morgan Lewis & Bockius, November 25, 2014: US08894952

A method of reducing nitrogen oxide includes a process of injecting a reductant including an amine compound and an exhaust gas including nitrogen oxide into a catalyst system including a silver alumina (Ag/Al2O3) catalyst.


10
Byong Kwon Cho: Dual bed catalyst system for NOx reduction in lean-burn engine exhaust. GM Global Technology Operations, January 24, 2012: US08099951

A method for reducing nitrogen oxides including NO and NO2 in an exhaust stream also including oxygen, carbon monoxide and hydrocarbons at a temperature above about 150° C. includes oxidizing NO in the exhaust stream to NO2, adding diesel fuel hydrocarbons and their oxygenates to the exhaust stream ...