Methane Oxidation over Noble Metal Catalysts as Related to Controlling Natural Gas Vehicle Exhaust Emissions

Three Way Catalysts (TWC) are extensively used for simultaneous control of three principal automotive pollutants, namely carbon monoxide (CO), Oxides of nitrogen (NOx), and hydrocarbon (HC). Most of works on three way catalytic converter have been carried out with noble metals such as Platinum, Rhodium, and Iridium have been tried individually and in different combinations and proportions. Noble metal catalysts give very good performance of reduction of (NOx), CO and HC in the narrow range of stoichiometric Air Fuel ratio. Noble metals are costly and not abundantly available. These draw backs of the noble metal catalysts have inspired to search for the alternative catalysts, which will perform well over the wide range of A/F ratio and are economical and abundantly available. This paper discusses the processing of ZSM-5 to Cu-Ion- Exchanged ZSM-5, ZSM-5 supported Cu-Pt bimetallic catalyst and Cu-Rh bimetallic catalyst and placing them in a three staged converter to study the reduction efficiencies of exhaust emissions CO, NOx, and HC in a 800 cc Maruti S. I. Engine. The experiments are carried out at 1500 rpm, 17.6 A/F ratio, different catalyst bed temperatures and different engine loads 0%, 17.5%, 35%, 52.5%, and 70% of full load. The results achieved are the maximum reduction of CO 90% at 375 °C NOx 90% at 375 °C and HC 61% at 380 °C. The same engine was also run for Noble metal converter (NMC) (EURO-II) purchased from an authorized Maruti distributor and the maximum reduction achieved were CO 89% at 375° C, NOx 91% at 375° C, and HC 70% at 390° C comparable to Zeolite Catalytic Converter (ZCC).

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Noble metal catalysts supported on gadolinium doped ceria used for natural gas reforming in fuel cell applications

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2006.01.024 ◽

2007 ◽

Vol 70 (1-4) ◽

pp. 498-508 ◽

Cited By ~ 35

Author(s):

Ulrich Hennings ◽

Rainer Reimert

Keyword(s):

Fuel Cell ◽

Natural Gas ◽

Noble Metal ◽

Metal Catalysts ◽

Doped Ceria ◽

Noble Metal Catalysts ◽

Natural Gas Reforming ◽

Gadolinium Doped Ceria

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Effects of rhodium addition on methane oxidation behavior of alumina-supported noble metal catalysts

Applied Catalysis B Environmental ◽

10.1016/0926-3373(94)00034-4 ◽

1994 ◽

Vol 5 (1-2) ◽

pp. 165-179 ◽

Cited By ~ 38

Author(s):

Se H. Oh ◽

Patricia J. Mitchell

Keyword(s):

Methane Oxidation ◽

Noble Metal ◽

Oxidation Behavior ◽

Metal Catalysts ◽

Noble Metal Catalysts

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Methane oxidation over alumina-supported noble metal catalysts with and without cerium additives

Journal of Catalysis ◽

10.1016/0021-9517(91)90149-x ◽

1991 ◽

Vol 132 (2) ◽

pp. 287-301 ◽

Cited By ~ 190

Author(s):

S OH

Keyword(s):

Methane Oxidation ◽

Noble Metal ◽

Metal Catalysts ◽

Noble Metal Catalysts

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ChemInform Abstract: Methane Oxidation Over Alumina-Supported Noble Metal Catalysts with and without Cerium Additives.

ChemInform ◽

10.1002/chin.199212087 ◽

2010 ◽

Vol 23 (12) ◽

pp. no-no

Author(s):

S. H. OH ◽

P. J. MITCHELL ◽

R. M. SIEWERT

Keyword(s):

Methane Oxidation ◽

Noble Metal ◽

Metal Catalysts ◽

Noble Metal Catalysts

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Styrene-divinylbenzene polymer oxidation catalyst

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19812657 ◽

1981 ◽

Vol 46 (11) ◽

pp. 2657-2662

Author(s):

Zdeněk Prokop ◽

Karel Setínek

Keyword(s):

Functional Groups ◽

Noble Metal ◽

Additional Data ◽

Catalytic Properties ◽

Metal Catalysts ◽

Oxidation Catalyst ◽

Noble Metal Catalysts ◽

Polymer Catalyst ◽

Styrene Divinylbenzene ◽

Polymer Oxidation

Some additional data about properties and applicability of a styrene-divinylbenzene polymer catalyst containing acidic and redox functional groups are reported. It is shown that the catalysts of this type can be prepared reproducibly and exhibit catalytic properties comparable to the properties of noble metal catalysts.

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