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Oxidation states of Cu in the CuO/CeO2/Al2O3 catalyst in the methanol steam reforming process
Ka-lok Chiu,Fung-luen Kwong,Dickon H.L. Ng 한국물리학회 2012 Current Applied Physics Vol.12 No.4
The biomorphic CuO/CeO2/Al2O3 was used as a catalyst in methanol steam reforming (SRMe), and the reaction mechanism was studied. It was found that the oxidation states of Cu in the biomorphic sample would vary with the reaction temperature and they also affected the rate of the reaction. Below 200 ℃,SRMe would not occur, and the X-ray diffractometry study indicated that the CuO/CeO2/Al2O3 sample remained unchanged. Above 200 ℃, the SRMe occurred when CuO started to be reduced to Cu. As the reaction temperature increased, Cu reacted with CO2 and led to the formation of Cu2O during the reversed water gas shift reaction. Above 250 ℃, the conversion of MeOH to CO2 and H2 reached to a saturation of 95% even if the amount of metallic Cu was reduced to half of its original portion. This confirmed that both Cu and Cu2O were active components for promoting SRMe.
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Conversion of egg shell membrane to inorganic porous CexZr1-xO2 fibrous network
Jia Li,Ka Lok Chiu,Fung Luen Kwong,Dickon H.L. Ng,Sammy L.I. Chan 한국물리학회 2009 Current Applied Physics Vol.9 No.6
The binary system CeO2–ZrO2 is thermally stable and has superior reduction–oxidation properties. It has been commonly used in the three-way catalytic converters for automobiles. In this work, an inorganic biomorphic porous CexZr1-xO2 fibrous network was successfully synthesized by using the egg shell membrane (ESM) as templates, and its morphology was a perfect replica of the original ESM. The synthesis involved a simple infiltration and calcination process. A fresh ESM was peeled from a chicken egg shell. It was soaked in a Ce(NO3)3 and Zr(NO3)4 mixture before it was calcined at 700 ℃ in ambient environment. The fibers in the biomorphic network had diameter ranged from 1 to 4 ㎛, and they were composed of CexZr1-xO2 nanocrystallites having an average grain size of ~10 nm. The binary system CeO2–ZrO2 is thermally stable and has superior reduction–oxidation properties. It has been commonly used in the three-way catalytic converters for automobiles. In this work, an inorganic biomorphic porous CexZr1-xO2 fibrous network was successfully synthesized by using the egg shell membrane (ESM) as templates, and its morphology was a perfect replica of the original ESM. The synthesis involved a simple infiltration and calcination process. A fresh ESM was peeled from a chicken egg shell. It was soaked in a Ce(NO3)3 and Zr(NO3)4 mixture before it was calcined at 700 ℃ in ambient environment. The fibers in the biomorphic network had diameter ranged from 1 to 4 ㎛, and they were composed of CexZr1-xO2 nanocrystallites having an average grain size of ~10 nm.
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