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Natural gas vehicle's (NGV's) hydrocarbon (HC) emission is mostly methane, and it is very hard to get rid of methane using conventional Pt/Rh based three-way catalytic converter since methane(CH4) is one of the most stable hydrocarbon species. In countries where HC is regulated in non-methane hydrocarbon (NMHC), CH4 emission is not a problem, but in other countries where HC is regulated in total hydrocarbon (THC), more effort is needed to meet the HC emission level of a NGV. In addition, methane is known to be responsible for global worming, and there is a movement to regulate CH4 emission in North America. Recent research showed that Pd/Rh based catalyst is an effective means of reducing CH4. Other research showed that the dispersion of noble metals instead of crystalization on substrate is also an effective means of reducing CH4.