| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 105 === Hydrogen is an ideal clean carrier. Zero carbon emissions can be achieved by using, hydrogen from the reforming of bio-ethanol. In our previous study CuNi-NiO interface in a (Cu-NiO) catalyst prepared by hard-template method can have good activity in ethanol steam reforming reaction(ESR), obtaining high hydrogen yield at mildle conditions. This study intends to improve the stability of CuNi-NiO interface and to prepare workable catalyst preparation method for industal application. In this study dope La and Gd in NiO as support for Cu, expecting the acticity interface can be stabilized by an increase in the NiO reduction temperature.
The results show that Cu/La15-NiO after P-2 pretreatment (250 ℃, 30min) have a degree of reduction of around 50% and good ESR activity. The CuNi alloy and NiO particle size are smaller than other catalysts, which can result in more CuNi-NiO interface. At 350℃, EtOH is nearly completely converted with C-products including 20% CH4, 15% CO and 60% CO2 and a H2 yield of 3.8. Comparing with different type and amount of dopant, the La-doped catalysts have better reaction performance than the Gd-doped catalysts.
The stability test of Cu/La15-NiO-P2 catalyst at 325℃ for 10 hours, indicate stable ESR activity the same H2 yield, the spent catalyst still contain NiO structure, indicating that the metal–doped Cu/La15-NiO catalyst can maintain stable CuNi-NiO interface under the ESR condition.
Keywords: Copper-nickel catalysts, pretreatment, steam reforming, metal oxide interface.
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