Abstract
This paper investigates the effects of CuO contents in the CuO-CeO2catalysts to the variation in physical properties of CuO/CeO2catalysts and correlates them to their catalytic activities on selective CO oxidation. The characteristic of crystallites were revealed by X-ray diffraction, and their morphological developments were examined with TEM, SEM, and BET methods. Catalytic performance of catalysts was investigated in the temperature range of 90–240°C. The results showed that the catalyst was optimized at CuO loading of 20 wt.%. This was due to the high dispersion of CuO, high specific surface area, small crystallite sizes, and low degree of CuO agglomeration. Complete CO conversion with near 100% selectivity was achieved at a temperature below 120°C. The optimal performance was seen as a balance between CuO content and dispersion observed with growth, morphology, and agglomeration of nanostructures.
Highlights
The generation of clean electrochemical hydrogen energy via proton exchange membrane fuel cells (PEMFCs) has attracted wide interests for stationary and mobile applications with high efficiency, high power density, and rapid startup
A multistep process requires for producing hydrogen on board usually accomplished by reform of hydrocarbons or methanol, followed by high and low temperature water gas shift reaction (WGSR) [1,2,3,4,5,6,7,8]
Efforts have been spent on the development of catalysts for the CO-PROX reaction, such as the noble metal-based catalysts (Pt, Pd, Ru, and Rh), gold-based catalyst, and transition metal based catalysts (Co, Cu, and Mn) [15, 16]
Summary
The generation of clean electrochemical hydrogen energy via proton exchange membrane fuel cells (PEMFCs) has attracted wide interests for stationary and mobile applications with high efficiency, high power density, and rapid startup. The characteristic properties that affect the catalytic performance are usually observed in terms of surface area, particle size, dispersion of the active metals, and structural defects such as oxygen vacancies [7]. These properties depend strongly on synthesis methods, pretreatment conditions, and presence of dopants [12, 22, 23]. The changes on morphology of nanostructures and agglomeration of structures observed with CuO loadings could assist us in identifying influential factors in term of synergistic effect on performance of the catalyst
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