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| Autor: | Yu-wen Liao, 廖鈺雯 |
|---|---|
| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 Nano-palladium catalyst has been reported to have high activity for hydrogenation reaction due to its excellent absorb ability of hydrogen. Comparing with other noble metals (Pt, Ru, Au etc.), Pd has relativity low cost. In this study, palladium-containing bimetals were loaded on titanium dioxide. Bimetallic Pd catalysts have been prepared and tested for p-chlornitrobenzene (p-CNB) hydrogenation reaction. All of the catalysts were prepared by incipient-wetness impregnation method using NaBH4 to reduce the metal cations. These catalysts were characterized by X–ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HR-TEM), energy dispersive spectrometer (EDS), and X-ray photoelectron spectroscopy (XPS). The activity test of liquid-phase p-CNB hydrogenation reaction was carried out with following reaction condition: 303K, 0.55MPa H2¬ partial pressure, stirring rate under 300 rpm in a batch reactor. 0.2M p-CNB methanol solution (2.54g p-CNB dissolved in 80 ml MeOH) as the reactant and 0.5g palladium-containing catalyst were used to catalyze this reaction. During the run, the samples were withdrawn periodically and analyzed by a gas chromatography. The results revealed that adding copper as an additive into the catalyst would enhance the dispersion of Pd.. The selectivity of main product, p-chloroaniline (p-CAN), was more than 90%. Palladium catalyst could operate in mild the reaction conditions, i.e, hydrogenation reaction could be carried out at room temperature and low hydrogen pressure. Adding Cu into Pd catalyst slightly caused the activity to decrease but provided significantly increase in selectivity of p-CNB to p-CAN. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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