| Summary: | 碩士 === 國防大學理工學院 === 化學工程碩士班 === 103 === Ni catalysts have been widely investigated for the steam reforming of ethanol due to its low cost and high activity. The main drawbacks of Ni-based catalysts are their rapid deactivation resulted from the carbon deposition at low reaction temperature and the sintering of Ni particles at high temperature. The perovskite-type oxides catalysts could avoid carbon formation, and present superior catalytic activity and stability. In the present research, Ce and Ca were doped into the LaNiO3 catalyst for the resistance of coke and sinter. The catalysts were prepared by method of co-precipitation and co-precipitation oxidation w/ or w/o ultrasonic assisted. Precursors were Ni(NO3)2•6H2O, La(NO3)3•6H2O, Ce(NO3)3•6H2O, Ca(NO3)2•4H2O, using NaOH as precipitant and NaClO as oxidant, and named as La1-x-yCexCayNiO3. All samples were characterized by using XRD, TEM, BET, TPR, EA and TG techniques. The catalytic activity on the steam reforming of ethanol (SRE) reaction was evaluated in a fixed-bed reactor. The reduced La0.4Ce0.5Ca0.1NiO3 sample shows more resistance to deactivation comparing to other loadings, both oxygen vacancy and La2O2CO3 in the reaction process acted as the carbon scavenger. Stronger MSI could improve the catalyst stability in SRE.
|
|---|
