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catalyst prepared by a galvanic deposition method exhibited notable catalytic activity for methane combustion, due to the higher reducibility of PdO nanoparticles on CoO x .Methane combustion has become increasingly important as a method for emission reduction of automotive exhaust gases. 1-3 It is well-known that methane has a global warming potential 23 times higher than that of CO 2 ; therefore, unburned methane should be oxidized to CO 2 and H 2 O.Supported palladium (Pd) catalysts have been utilized recently for methane combustion. In particular, the alumina-supported Pd (Pd/Al 2 O 3 ) catalyst has received special attention due to its high catalytic activity and thermal stability. However, their catalytic activities are still insufficient at lower temperature. To obtain catalysts with higher activity, the additive effect on Pd/Al 2 O 3 has been investigated. Widjaja and co-workers examined MO x (M = Co, Cr, Cu, Fe, Mn and Ni) promoted Pd/Al 2 O 3 catalysts and reported that Ni and Co were effective for promotion of methane combustion. 28 Liu and co-workers investigated the effect of metal oxides on Pd/ Al 2 O 3 catalysts and reported that the formation of NiAl 2 O 4 and MgAl 2 O 4 spinel phases would be beneficial for the methane catalytic performance. 31,32 Recently, Cargnello et al. reported that the Pd core and CeO 2 shell deposited onto modified hydrophobic alumina displayed high methane combustion activity due to an increase of metal-support interface. 7 To improve the catalytic performance of Pd/Al 2 O 3 , it is crucial to precisely control the interface between the metal (Pd) and metal oxide (MO x ) on Pd/MO x /Al 2 O 3 .We previously reported that the galvanic deposition method has potential to control the interface of two metal components. 33,34 This method is based on galvanic replace-Catal. Sci. Technol. This journal is

Pd/CoAl2O4/Al2O3 methane combustion catalysts were synthesized using a galvanic deposition (GD) method (PdCoAl-GD).

<div class="section abstract"><div class="htmlview paragraph">Global focus on CO₂ reduction and environmental protection is increasing. To comply with stricter exhaust gas regulations and reduce real world emissions, it is becoming increasingly important to improve the performance of three-way catalysts. Therefore, highly efficient conversion of hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx) is required. In general, the more active the precious metals used, the better the conversion performance. However, precious metals have supply risks, such as price fluctuation and the uneven distribution of production areas. Therefore, it is necessary to lower emissions while also lowering the amount of precious metals used. This paper focuses on how catalysts are used and describes the development of a new three-way catalyst for the purpose of strengthening cold conversion and decreasing the usage of precious metals.</div></div>