Abstract
Nanoporous CuO/CeO2 ribbons are successfully prepared through dealloying melt-spun Al80-xCu20Cex (x = 0.5, 1, 2, 3, at%) alloy in a 5 wt% NaOH aqueous solution, followed by calcining in air. The samples are characterized by XRD, SEM, EDS, HRTEM, Raman and gas chromatograph. For the dealloyed melt-spun Al80-xCu20Cex (x = 0.5, 1, 2, 3, at%) alloy, the XRD results indicate that Cu and Cu2O are formed, while CuO and CeO2 are formed coupled with calcinations. The SEM shows that the CuO/CeO2 ribbons with a homogeneous pore/grain structure are thermally stable up to 600℃because uniform CeO2 particles are dispersedly loaded on the fine CuO grains of the porous structure, which is validated by TEM again. Meanwhile, the Raman spectra show that the concentration of oxygen vacancies reach a maximum value when the calcining temperature at 600℃. In addition, the gas chromatograph results show that the dealloyed Al78Cu20Ce2 ribbons with calcined at 600℃have the best active catalysis for CO oxidation and the rates of CO conversation reaching at 50% and 100% are 150℃and 320℃, respectively, owing to the synergetic effects of the CuO and CeO2 species.
Highlights
Cerium oxide is an important rare earth oxide and has been widely investigated in the automotive exhaust purification, oxygen storage and release catalysis, and solid oxide fuel cell applications [1]-[3]
Xiucheng Zheng et al have reported that CuO/CeO2 catalysts prepared thermal decomposition combined with impregnation can significantly promote the low-temperature CO oxidation, which were studied by using a microreactor-GC system
These results confirm that the CuO/CeO2 composite are achieved through chemical dealloying combined with subsequent calcination
Summary
Cerium oxide is an important rare earth oxide and has been widely investigated in the automotive exhaust purification, oxygen storage and release catalysis, and solid oxide fuel cell applications [1]-[3]. Xiucheng Zheng et al have reported that CuO/CeO2 catalysts prepared thermal decomposition combined with impregnation can significantly promote the low-temperature CO oxidation, which were studied by using a microreactor-GC system. It suggests that the physical properties of CeO2 supports affect the catalytic activity of the CuO/CeO2 catalysts [4]. The objective is aimed at developing a high-performance catalyst and gain a better understanding of the interfacial interaction between transition metals and CeO2 while studying their catalytic activity in low temperature CO oxidation. It is expected that the strategy reported here can be extended to other nanoporous metal-oxidate materials for widespread applications, and offer a new direction for nanocomposites
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
